Understanding abrasion can be the key to extending the life of your refractory lining. The following article provided by Plibrico Company examines abrasion resistance, its role in choosing a refractory solution, and what factors to take into consideration when assessing counter-measures.
Refractory material is designed to be very durable, withstand extreme service conditions and defy mechanical abuse in many different types of thermal-processing operations. However, severe conditions that cause abrasion in the form of high levels of mechanical scraping and airborne particulate matter can challenge refractories, shortening their service lives.
Abrasion resistance is one of the most critical and possibly the most misunderstood considerations when choosing a refractory solution. A clear understanding of what abrasion is and, perhaps more importantly, what it is not can prevent needless repair costs and lead to significant savings. This is especially important when evaluating refractory designs for a new application or when considering upgrades for an existing one.
What Abrasion Is
Abrasion is the destructive process that causes a material to wear away through mechanical scraping or scratching. Anyone who has ever grated cheese or sanded wood has experienced the abrasion encountered in everyday life. As abrasion continues, thin layers of the abraded material are removed, leaving the object thinner and usually making its surface smoother.
The same process can be observed in the refractory world. Refractory linings are abraded by high-velocity airborne particulate, cleaning tools and fuel/process materials that pass through the unit and come into contact with the lining. The telltale sign of abrasion is a refractory lining that has steadily become thinner while its surface has become smoother. The surface may even shine as if it had just been polished, which is not surprising when we consider that polishing is another common form of abrasion.
Fig. 1. Abrasion damage to the refractory bottom of a choke ring of a thermal-oxidizer unit
What Abrasion is Not
Abrasion is considered a type of mechanical abuse, but it is not the only type of mechanical abuse to which refractory linings are subjected. Equally common is impact: the sudden, forceful collision between the refractory lining and a moving object. Impact can come from a variety of sources. The moving object may be a cleaning tool, a piece of process material, a chunk of fuel or a dislodged mass of refractory or slag, depending on the application. Impact with such objects typically results in chips and cracks in the refractory lining.
Refractory materials designed for abrasion resistance tend to have increased strength and hardness compared to those found in traditional refractories, and these abrasion-resistant materials may provide some resistance to impact. Abrasion-resistant properties can also lead to increased brittleness. This is because if the impact exceeds the strength of the material, chipping and cracking could potentially be worse than in traditional refractories.
Compression and tension are also forms of mechanical abuse and can be caused by changes in the shape of the refractory lining as it is heated or cooled or by movements of the furnace shell itself – by intentional design or otherwise. Here again the increased strength and corresponding brittleness of the material could potentially result in a negative effect on the refractory lining.
All types of mechanical abuse can cause thinning of the refractory lining, so it is important to conduct a detailed investigation into the destructive mechanism before drawing any conclusions. Refractory solutions designed to resist abrasion may not be helpful against damage caused by impact, compression or tension.
Similarly, solutions designed to address other types of mechanical abuse may be ineffective against abrasion. For example, stainless steel needles are commonly incorporated into refractory linings to extend service life when impact resistance is required. The needles bridge cracks formed as a result of the impact, making it more difficult for these cracks to grow and connect. This helps the refractory lining hold together longer. The bridging provided by needles has no effect in an abrasion situation, however, since crack growth is not caused by the abrasion process.
Meeting Abrasion-Resistance Demands
Once abrasion is identified as the main mode of failure, there are several options to counter it. Selecting a refractory material based on a raw material hard enough to resist the abrasion is a common technique. For one material to abrade another it must be harder than the material being abraded. For instance, a diamond can be used to scratch glass, but glass cannot be used to scratch a diamond.
It follows that refractory materials based on very hard raw materials, like silicon carbide, can be used to resist abrasion and extend the life of the lining. It should be remembered, however, that a refractory lining is made up of many different materials, not just the main constituent raw materials. Clay, cement, silica and other softer components will still be exposed and abraded even if abrasion of the main aggregate is stopped completely.
Another option is to investigate the source of the abrasion and make adjustments to the process. Can a less-abrasive cleaning tool be used? Is there a way to limit the contact of the abrading process materials with the refractory lining? Is it possible to adjust the angle between the refractory lining and the incoming airborne particulate?
A seemingly minor change in the process, with minimal cost and no downsides to the operation, can save in refractory replacement costs. When changes to the process are not an option, it is best to consider the abrasion resistance of the lining as a whole and select a specifically designed abrasion-resistant solution. A qualified, knowledgeable refractory solution expert with genuine experience will help you make the best decision for your specific application, taking into consideration the following:
Speed of installation
Service life
All-in price
Fig. 2. Airborne particle matter has contributed to the abrasion damage seen in the refractory of a thermal-oxidizer choke ring. Notice on the left side of the photo how the abrading of the refractory lining becomes worse.
Abrasion-Resistance Testing
The most common measure of holistic abrasion resistance used to compare refractory solutions is the ASTM 704 test. This test exposes refractory lining materials to a stream of abrasive particulate that cause a portion of the sample to be abraded over time. By keeping sample size and shape constant – along with particle velocity, particle material and test duration – various refractory materials can be compared on an apples-to-apples basis.
This testing can be performed by any qualified refractory testing lab and most reputable refractory manufacturers. Test results are recorded based on the volume of material lost from the sample during the test and are reported in cubic centimeters. Products with excellent abrasion resistance consistently test at 5 cc of loss or less, while elite materials can score less than 3 cc of loss.
Products designed specifically for abrasion resistance will report ASTM 704 results on their material technical data sheets. It is important to remember that the abrasion-loss numbers reported on material technical data sheets are based on samples prepared in a lab under controlled conditions. Achieving these same properties in the field under real-world, job-site conditions would require a high-quality refractory installer partnered with a world-class refractory manufacturer.
Fig. 3. Severe conditions lead to abrasion damage in the refractory lining of this dry-ash hopper. Notice the abrasion damage goes past the anchor line, leaving the bottom-left anchors exposed.
Conclusion
The thinning of a refractory lining due to abrasion is a source of frustration for many thermal-processing operations and is one of the most common modes of failure encountered in the refractory world. But, by taking the time to understand the failure mechanism and learn about the options available, you can realize significant savings by avoiding needless costs in the future.
If curiosity were a person, Brynna Keelin Kelly-McGrath would be her name. Having risen at Moog, Inc. to the position of materials and process engineer, Brynna shares her early STEM interests and how she stays up-to-date on industry trends and ideas. In this highly engaging NextGen profile on Heat TreatRadio — with host and Heat TreatToday’s publisher, Doug Glenn — get to know this talented metallurgist.
Below, you can watch the video, listen to the podcast by clicking on the audio play button, or read an edited transcript.
The following transcript has been edited for your reading enjoyment.
Meet Brynna Keelin Kelly-McGrath (01:00)
Doug Glenn: Let’s jump into today’s Heat Treat Radio episode with Brynna Keelin Kelly-McGrath from Moog, Inc. It’s a great pleasure to be here today with Brynna, who is one of our 40 Under 40 Class of 2023 award recipients. First off, congratulations on that award, and welcome to Heat Treat Radio.
Brynna Keelin Kelly-McGrath: Thank you so much. That was an honor.
Doug Glenn: Brynna lives just south of Buffalo, New York. As you know, this interview is to get to know you a little bit more — how you got into metallurgy, heat treating, and all that good stuff. Let’s start way back. Give us a little bit about yourself as a younger person, maybe high school age and moving on up through, and then how you got involved with heat treating and metallurgy.
Check out Brynna’s 40 Under 40 profile. Click the logo.
Brynna Keelin Kelly-McGrath: Sure. I grew up in a little town called West Falls, south of Buffalo, New York, and about 20 minutes from Moog. While I was in high school, I took AP chemistry and physics and fell in love with those topics. I knew from a younger age that I was going to wind up being an engineer eventually; I just didn’t know what kind. But I was pretty sure I wanted to be a chemical engineer, so I toured a couple of colleges.
At one of them, I met with a materials science professor to talk about the differences between chemical and materials science engineering. I was sold. I was all set and ready to go be a polymers engineer. I picked Purdue University, started going there, and was absolutely loving it.
The summer after my freshman year, I got an internship with Moog, which was right around the corner from my hometown. The internship was primarily metallurgical, due to the nature of Moog’s products, and I absolutely loved it. I was not expecting to like it, and it was just so great. So, I transitioned all of my coursework over to metallurgy, and I kept coming back to Moog for internships, and that was fantastic.
Learning from Industry Experts (03:32)
When I started off at Moog, it was right around the time when two of our subject matter experts in heat treatment were transitioning to retirement. I started learning as much as I could as fast as I could about heat treatment. There was obviously a lot to learn there, but it was a great time.
After working at Moog for a couple of years, I decided I wanted to go back and pursue my other passion, which was manufacturing engineering. So, right now I’m working on a master’s degree after work to combine metallurgy and manufacturing.
“When I started off at Moog, it was right around the time when two of our subject matter experts in heat treatment were transitioning to retirement. I started learning as much as I could as fast as I could about heat treatment.”
Brynna Keelin Kelly-McGrath, Moog
Doug Glenn: Wow. You’re a classic overachiever. That’s pretty good. And you said Purdue, correct?
Brynna Keelin Kelly-McGrath: Yeah.
Doug Glenn: Okay. And you did your undergrad there. Did you actually end up graduating with a materials engineering degree or a metallurgy degree?
Brynna Keelin Kelly-McGrath: Materials science and engineering.
Brynna shares how she got started in the industry. Source: Heat Treat Today
Doug Glenn: All right. Good. You spent the summers back at Moog and enjoyed that. You know, we see a lot of the older generation retiring, so you’re filling the brain drain, as we say, which is great. Are there are many other young people at Moog?
Brynna Keelin Kelly-McGrath: Yeah, their internship co-op program has been fantastic in bringing in a lot of students right out of college and getting them hooked on our product line and the sort of manufacturing we do. And we’re definitely getting more recent college graduates. But, you know, with people retiring, those are some awfully big shoes to fill.
Doug Glenn: For sure. What exactly does Moog make at your facility? They’re a large corporation; I know they usually make a lot of automotive, maybe aerospace, components but are you able to say specifically what Moog does there?
Brynna Keelin Kelly-McGrath: We specialize in high precision motion actuation systems. From a metallurgical side, we’re working with a ton of really cool materials. So it’s not just steels or aluminum, it is a lot of aerospace applications, defense. The materials and process engineering group is physically orchestrated on our headquarters campus as well as the space and defense building, so we do get to see quite a bit of that. From the metallurgical perspective, there is a lot to see and work on.
Doug Glenn: You mentioned you were thinking about being a chemical engineer, but then you saw the materials. Do you remember what it was about that and metallurgy that attracted you? Anything specific?
Brynna Keelin Kelly-McGrath: I remember sitting through that talk with a materials professor at Purdue, and he was talking about what the day to day of a chemical engineer versus materials engineer looks like. I will not pretend that he wasn’t biased, because he was a materials professor. But the work he described for materials engineering was so diverse, and there were options for different settings and what you could end up working on — from being in a steel mill to working in a lab like I do. There are a lot of options, a lot of cool things. The slogan at Purdue was something along the lines of: you can’t make it without materials.
Brynna’s Family Background (07:30)
Doug Glenn: That’s really neat. So, I haven’t asked you about your family at all. What did they think when you told them, hey, I’m thinking about being a materials engineer or a metallurgist?
Brynna Keelin Kelly-McGrath: My father is an industrial engineer, and my mother is a pharmacometrician, so they’re both in the stem field already. I think it was no surprise that I was going to pursue engineering and then, metallurgical engineering specifically. I think they were happy to encourage me to pursue any of my passions. And my father knew a couple of materials engineers and thought that it would work out for me. They were excited.
Undergraduate Research (08:16)
Doug Glenn: They were very supportive. That’s great. When you did your undergrad at Purdue, did you have to work on a final paper or any specific projects that were of interest to you?
Brynna Keelin Kelly-McGrath: I did some undergraduate research in the metallurgy realm. But my senior project for graduation was along the lines of characterizing shot for shot peening and the degradation of shot and the residual stress that it imparts. It was like a cool mix of FEA modeling with actually characterizing the material. It was a neat project.
Doug Glenn: Have you had to do any of that at Moog?
Brynna Keelin Kelly-McGrath: There’s a fair deal of materials characterization. We have shot peening, but I’m not super involved with it.
Current Work at Moog (09:35)
Doug Glenn: Gotcha. That’s interesting. Can you describe what your typical day at Moog looks like now and what you’re working on?
Brynna Keelin Kelly-McGrath: Sure. My typical day is a good deal of talking with all types of engineers, explaining metallurgical concepts. Because we work on a lot of different materials, there’s a lot to understand there. A good portion of my role is talking with other engineers about how a heat treatment procedure works or what’s metallurgically happening, how to modify a manufacturing sequence, how to design so that the product’s going to work.
But then I also specifically work in a failure analysis lab. This could be anything from something’s coming off the manufacturing line a little bit wrong or something failed in the field. We’ve got a beautiful characterization lab full of all the toys that you could think of, including two SEMs and a chemical lab. There’s a good deal of analysis there, too.
Doug Glenn: You seem like a person who enjoys your work. Is there any specific story or instance of something happening, either in school or at work, that really made you happy that you were in metallurgy and heat treat?
Brynna Keelin Kelly-McGrath: Oh, goodness. That’s a good question.
I would have to say I’ve had a couple projects at work, without getting into too many specifics, where we discovered something new metallurgically that we didn’t know was happening before. And then working through that, how did we not know it before? What do we know about it now? And what are we going to do to utilize this new thing that we discovered and take advantage of it? From a heat treat perspective, sometimes that means modifying our procedures, modifying our fixturing, creating something new.
It’s neat to see the modifications happen and come up with the new parts on the other end. It’s been very exciting to work on interdisciplinary teams like that.
“My typical day is a good deal of talking with all types of engineers, explaining metallurgical concepts. Because we work on a lot of different materials, there’s a lot to understand there. A good portion of my role is talking with other engineers about how a heat treatment procedure works or what’s metallurgically happening, how to modify a manufacturing sequence, how to design so that the product’s going to work.” Source: Heat Treat Today
Doug Glenn: Yeah. I’m curious about this. You’ve been out in the work world for how many years?
Brynna Keelin Kelly-McGrath: Three and a half.
Doug Glenn: Okay. So, you’ve been out of school and working four years, and the amount you know about metallurgy and heat treating now is four years’ worth. Does it kind of amaze you the amount of stuff we don’t know?
Brynna Keelin Kelly-McGrath: Absolutely. Metallurgy is an old science, but you know we’re still [developing] the tools and technology and it’s great to find out new things.
Doug Glenn: Right. A lot of people get involved and say, “Well, I don’t want to go into metallurgy and heat treat because it’s a mature industry,” but I was curious if you felt the same way.
It’s really quite fascinating because there is a lot that happens. Like you were saying at Moog when you discovered things, a lot of stuff that’s happening and we really don’t know why. The more we can discover about it, the better.
Brynna Keelin Kelly-McGrath: Absolutely.
Top Industry Resources (12:58)
Doug Glenn: Let me ask you this. You obviously come from a smart family; you’ve got parents who are well educated, and you are as well. What are some of the metallurgical/heat treat resources that you use to stay current?
Brynna Keelin Kelly-McGrath: I think the best resource that’s out there is people. The network that I’ve been growing comes from a variety of different sources. I’m part of a few industrial committees, and it’s just a great way to meet people from all ends of the spectrum of metallurgy — from those producing the material to those making something out of it to the people who are going to use it all the way down the line.
Finding other metallurgists in those realms, and also through venues like ASM and our local Buffalo chapter — meeting people who have more experience than I do and have seen it before. If I’m seeing something for the first time, there’s definitely someone who spent their whole career on that. It’s really great to tap into those resources. That’s my number one.
And then my second choice would be the ASM handbooks. I’ve always got at least two open on my desk.
“I think the best resource that’s out there is people.”
Brynna Keelin Kelly-McGrath, Moog
Doug Glenn: Those are great resources. ASM over the years has pumped out some very, very good stuff. Is there anything else about your work or your schooling that is of interest or excited you that you’d like to share?
Brynna Keelin Kelly-McGrath: I really liked working at Moog because it’s a cool application where I can use my metallurgical knowledge along with this new manufacturing knowledge that I’m building up. That was my favorite intersection with my undergrad degree. And now I get to actually try that out in a working sense. That’s been great.
Doug Glenn: And you’re doing a master’s in industrial engineering?
Brynna Keelin Kelly-McGrath: The University of Michigan.
Doug Glenn: Remotely, I’m assuming?
Brynna Keelin Kelly-McGrath: Yes.
Doug Glenn: Very nice. And how far along are you, and how much longer do you have to go there?
Brynna Keelin Kelly-McGrath: I’m hoping to graduate in December, so I’m coming closer to the finish line.
Doug Glenn: Congratulations. That’s really good.
Rapid-Fire Round (15:44)
Doug Glenn: I want to move off of metallurgy and heat treat just to learn a little bit more about Brynna. All right, so these quick questions are what I call the rapid-fire round. Brace yourself. Are you a Mac or a PC person?
Brynna Keelin Kelly-McGrath: I am a Mac person through and through. I love my Mac.
Doug Glenn: Do you use a Mac at work?
Brynna Keelin Kelly-McGrath: I wish, but no.
Doug Glenn: We have an ongoing debate here. We had a couple people that came into the organization with Macs, and I’ve always been a PC guy. So, anytime there’s a computer problem, we tease each other, “Well, that’s because you’re working on a Mac/you’re working on a PC.” Well, that’s good to know. And for your phone: Are you an Apple phone person?
Brynna Keelin Kelly-McGrath: Yeah, I’ve got an iPad. And I just got a new MacBook Air the other day.
Doug Glenn: You’re hardcore. Very good.
So, we’re a publishing company here at Heat Treat Today. And I like to ask this question: When you consume media, do you prefer hard copy or digital?
Brynna Keelin Kelly-McGrath: I prefer digital. I like to have all of my work life very organized by topic, and it’s way easier for me to organize everything if I have a digital copy of it. So even if it’s a print copy, I’ve been known to scan and file it the way that I file everything else.
Doug Glenn: Okay. Now what do you value more in work — a flexible work schedule or high pay?
Brynna Keelin Kelly-McGrath: I’m going to go with flexible work schedule. I’ve had some people close to me who have the high pay but no flexibility. And they’re the ones more jealous, so I’m going to go with that. I’ll take the flexibility.
Doug Glenn: That’s a great answer. Here’s one: Would you rather work remotely or in an office?
Brynna Keelin Kelly-McGrath: In an office 100%, I am definitely of the variety that likes to be around people. I would rather have people to talk to face to face than doing it over Teams.
Doug Glenn: I kind of assumed you were like that. How did you handle all the isolation that came with the recent pandemic?
Brynna Keelin Kelly-McGrath: I was still in college at that time for most of Covid. Purdue was only remote for half of one semester. It was a reasonably short time. And then the rest of the time we had limited capacity in classrooms and things. But when I was coming back for my internships, our department was classified as essential. We were coming into the office every day, and that was good, I enjoyed that.
Doug Glenn: So, you didn’t necessarily really have a lot of the isolation or as much as you might have had.
Brynna Keelin Kelly-McGrath: Yep.
Doug Glenn: That’s good. Okay, I won’t keep going down that road. I think that whole time period has been very impactful on our society. And I’m curious how people feel it has affected them.
I know you love working at Moog, but if you had a dream job, what would it be?
Brynna Keelin Kelly-McGrath: I don’t know. I think someday down the line, it would be cool to have my own manufacturing business. I don’t have a product in mind at the moment, but in my thoughts it has to do with metallic components and heat treatment, because that’s my passion. That would be great.
Doug Glenn: Very interesting, owning your own company and manufacturing something metal. You know what? That’s where it starts. You’re three and a half years out, and you’ve got time to develop more specificity over time. But that’s good to even know that you’re moving in that direction.
I assume you don’t work all the time. What do you do? What do you do in your free time? What do you like? What are your passions outside of work?
Brynna Keelin Kelly-McGrath: The number one time consumer at the moment is that master’s degree. But then, you know, on a pure fun basis, my husband and I are avid golfers. And all of the very short Buffalo summer we’re trying to be out there on the golf course.
“But then, you know, on a pure fun basis, my husband and I are avid golfers. And all of the very short Buffalo summer we’re trying to be out there on the golf course.” Source: Richard-7 / Getty Images Signature
Brynna Keelin Kelly-McGrath: I’m also a bluegrass fiddler. I play in a couple bands. And that’s pretty fun, too. It’s almost Saint Patrick’s Day.
Doug Glenn: You’re a musician? You know, I’ve heard that there are some engineering schools who don’t ask you if you play an instrument, they ask you what instrument you play because there is a correlation somehow or other between music and engineering. Maybe it’s the methodical-ness, the orderliness, and all that stuff.
Brynna Keelin Kelly-McGrath: Neat, I didn’t know that.
Doug Glenn: If you’re playing bluegrass fiddle, I assume you play some by ear. I mean, I assume you’ve got some sort of natural talent there. Is that safe to say?
Brynna Keelin Kelly-McGrath: Yeah, I started that at a decently young age. And now my husband and I are learning piano as well, so it’s been fun.
Doug Glenn: What does your husband do by chance?
Brynna Keelin Kelly-McGrath: He’s a software engineer.
Doug Glenn: Two engineers in one house. That’s got to be interesting dinner time talk. That’s wonderful.
Okay. Last question for you. I give people an option here. You can answer any one of these three. What would be your favorite app, movie, or magazine?
Brynna Keelin Kelly-McGrath: The first thing that came to my mind when you asked that question was Audible. At the moment, I’m hooked on reading, or listening, to a lot of books. I consider it reading in the little bits of downtime here and there grocery shopping and driving in the car and things like that. It’s nice to spend that time a little bit more productively.
Doug Glenn: I’m with you. I think that’s great. I assume maybe you can even do some of your school reading on Audible?
Brynna Keelin Kelly-McGrath: I haven’t tried that yet. Honestly.
Doug Glenn: Sometimes people learn better by actually reading. But other people learn better by listening, so that’s fine.
If you were to encourage young people to really look into metallurgy materials, what would you tell them? What would be your encouragement to them?
Brynna Keelin Kelly-McGrath: I think the most impactful thing for me at that age was actually getting to see what they do. At Moog, I act as a tour guide for a lot of high school students. I try to show them as closely as possible what we do and what a day looks like. Because it’s great to think about the theory, but at the end of the day when you graduate with that degree, you’ve got to go work. I encourage high school students to get out there and see as many jobs as possible. Shadow people — I guess that would be my advice.
Doug Glenn: That’s good. Well, Brynna, thanks so much. Congratulations again on being awarded 40 Under 40 this last year. And thanks for taking some time to chat with us.
Brynna Keelin Kelly-McGrath: Thank you so much.
About The Guest
Brynna Keelin Kelly-McGrath Materials and Process Engineer Moog, Inc. Source: Brynna Keelin Kelly-McGrath
Brynna Keelin Kelly-McGrath received her bachelor’s degree in Materials Science and Engineering from the Purdue University Honors College. She is currently working on a master’s degree in Manufacturing Engineering from the University of Michigan Ann Arbor. Brynna conducts metallurgical support for day-to-day heat tree issues and non-conformances across several divisions within Moog, Inc. She was recognized in Heat Treat Today’s 40 Under 40 Class of 2023.
Contact Brynna by visiting Moog, Inc.’s website: www.moog.com.
Given changing ecological and economic conditions, carbon neutrality is becoming more important, and the heat treatment shop is no exception. In the context of this article, the focus will be on how manufacturers — especially those with in-house heat treat — can save energy by evaluating heating systems, waste heat recovery, and the process gas aspects of the technology.
This article, written by Dr. Klaus Buchner, head of Research and Development at AICHELIN HOLDING GmbH, was released in Heat Treat Today April/May 2024 Sustainable Heat TreatTechnologiesprint edition.
Introduction
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Uncertainties in energy supply and rising energy costs remind us of our dependence on fossil fuels. This underlines the need for a sustainable energy and climate policy, which is the central challenge of our time.
European policymakers have already taken the first steps towards a green energy revolution, and the heat treatment industry must also take responsibility. Many complementary measures, however, are needed that can be applied to new and existing thermal and thermochemical heat treatment lines.
Heat Treatment Processes and Plant Concepts
The heat treatment process itself is based on the requirements of the component parts, and especially on the steel grade used. If different concepts are technically comparable, it is primarily the economic aspect that is decisive, and not the carbon footprint — at least until now. Advances in materials technology and rising energy costs are calling for production processes to be modified.
Figure 1. Donut-shaped rotary-hearth furnace for carburizing with press quenching Source: AICHELIN HOLDING GmbH
An example is the quenching and tempering of automotive forgings directly from the forging temperature without reheating, which has shown significant potential for energy and CO2 savings. Although the reduced toughness or measured impact energy of quenching and tempering from the forging temperature may be a drawback due to the coarser austenite grain size, this can be partially improved by Nb micro-alloyed steels and higher molybdenum (Mo) contents for more temper-resistant steels; it may also be necessary to use steels with modified alloying concepts when changing the process.1, 2 AFP steels (precipitation-hardening ferritic pearlitic steels) and bainitic air-hardening steels can also be interesting alternatives, since reheating (an energy-intensive intermediate step) is no longer necessary.
Similar considerations apply to direct hardening instead of single hardening in combination with carburizing processes because of the elimination of re-austenitizing. Distortion-sensitive parts often need to be quenched in fixtures due to the dimensional and shape changes caused by heat treatment. Heat treated parts are often carburized in multipurpose chamber furnaces or small continuous furnaces, cooled under inert gas, reheated in a rotary-hearth furnace, and quenched in a hardening press. In contrast, ring-shaped (aka donut-shaped) rotary-hearth furnaces allow carburizing and subsequent direct quenching in the quench press in a single treatment step. Figure 1 shows a typical ring-shaped rotary-hearth furnace concept for heat treating 500,000 gears per year/core hardness depth (CHD) group 1 mm.
Table 1. Saving potential due to increased process temperature for gas carburizing (pusher type furnace, 20MnCr5, CHD-group 1 mm) Source: AICHELIN HOLDING GmbH
This ring-shaped rotary-hearth concept can save up to 25% of CO2 emissions, compared to an integral quench furnace line (consisting of four single-chamber furnaces, one rotary hearth furnace with quench press and two tempering furnaces as well as two Endothermic gas generators). Due to the reduced total process time (without reheating) and the optimized manpower, the total heat treatment costs can be reduced by 20–25%.
The high-temperature carburizing aspect should also be mentioned, although the term “high-temperature carburizing” is not fully accepted nor defined by international standards. As the temperature increases, the diffusion rate increases and the process time decreases. As shown in Table 1, the additional energy consumption is less than the increase in throughput that can be achieved. Therefore, the relative energy consumption per kg of material to be heat treated decreases as the process temperature increases.
There are three key issues to consider when running a high-temperature carburizing process:
Steel grade: Fine-grain stabilized steels are required for direct hardening at temperatures of 1832°F (1000°C). Microalloying of Nb, Ti, and N as well as a favorable microstructure of the steels reduce the growth of austenite grains and allow carburizing temperatures up to 1922°F (1050°C) for several hours.
Furnace design: In addition to the general aspects of the optimized furnace technology (e.g. heating capacity, insulation materials, and feedthroughs), failure-critical components must be considered separately in terms of wear and tear, whereby condition monitoring tools can support maintenance in this area.
Distortion: This is always a concern, especially in the case of upright loading of thin-walled gear sections. As such, numerical simulations and/or experimental testing should be performed at the beginning to estimate possible changes in distortion and to take measures if necessary.
Figure 2. Recuperative burner with SCR system for NOx reduction
Source: AICHELIN HOLDING GmbH
Heating System
Based on an energy balance that considers total energy losses, and preferably also temperature levels, it can be seen that the heating system plays a significant role. In addition to the obvious flue gas loss in the case of a gas-fired thermal processing furnace, the actual carbon footprint must be critically examined.
In the case of natural gas, the upstream process chain is often neglected in terms of CO2 emissions, but the differences in gas processing (which are directly linked to the reservoirs) and in gas transportation can be a significant factor.3 However, the analysis of energy resources in the case of electric heating systems is much more important. This results in specific CO2 emissions between 30–60 gCO2/kWh (renewable-based electricity mix) and 500–700 gCO2/kWh (coal-based electricity mix). Therefore, a general comparison between natural gas heating and electric heating systems in terms of carbon footprint is often misleading.
Figure 3. Comparison of specific CO2 emissions
Source: AICHELIN HOLDING GmbH
Nevertheless, in the case of gas heating, the aspect of combustion air preheating should be emphasized, as it has a significant influence on combustion efficiency. The technical possibilities in this area are well known and include both systems with central air preheating and decentralized concepts, where the individual burner and the heat exchanger form a single unit. Recuperator burners are often used in combination with radiant heating tubes (indirect heating) in the field of thermochemical heat treatment. With respect to oxy-fuel burners, it should also be noted that the formation of thermal NOx increases with increasing combustion temperature and temperature peaks. To avoid exceeding NOx emissions, staged combustion and so-called “flameless combustion” — characterized by special internal recirculation — and selective catalytic reduction (SCR) can be used. The latter secondary measure, together with selective non-catalytic reduction (SNCR), has been state-of-the-art in power plant design for decades and has become widely known because of its use in the automotive sector. This system can also be adapted to single burners (Figure 2). In this way, NOx emissions can be reduced to 30 mg/Nm3 (5% reference oxygen), depending on the injection of aqueous urea solution, as long as the exhaust gas temperature is in the range of 392/482°F (200/250°C) to 752/842°F (400/450°C).4
Whether electric heating is a viable alternative depends on both the local electricity mix and the design of the heat treatment plant, which may limit the space available for the required heating capacity. In addition to these technical aspects, the security of supply and the energy cost trends must also be considered. Both of these factors are significantly influenced by the political environment. Figure 3 shows an example of the specific carbon footprint per kg of heat treated material with the significant losses based on the example of an integral quench furnace concept in the double-chamber and single-chamber variants electrically heated (E) and gas heated (G). The electric heating is based on a fossil fuel mix of 485 gCO2/kWh. Once again, it is clear that a general statement regarding CO2 emissions is not possible; rather, the boundary conditions must be critically examined.
Waste Heat Recovery — Strengths and Weaknesses of the System
Although improvements in the energy efficiency of heat treatment processes, equipment designs, and components are the basis for rational energy use, from an environmental perspective it is important to consider the total carbon footprint. An energy flow analysis of the heat treatment plant, including all auxiliary equipment, shows the total energy consumption and thus the potential savings. Quite often the temperature levels and time dependencies involved preclude direct heat recovery within the furnace system at an economically justifiable investment cost. In this case, cross-plant solutions should be sought, which require interdepartmental action but offer bigger potential.
In addition to the classic methods of direct waste heat utilization using heat exchangers, also in combination with heat accumulators, indirect heat utilization can lower or raise the temperature level of the waste heat by using additional energy (chiller or heat pump) or convert the waste heat into electricity. The overview in Table 2 provides reference values in terms of performance class and temperature level for the alternative technologies listed.
Process Gas for Case Hardening
Case hardening — a thermochemical process consisting of carburizing and subsequent hardening — gives workpieces different microstructures across the cross-section, the key factor being high hardness/strength in the edge region. A distinction can be made between low pressure carburizing in vacuum systems and atmospheric carburizing at normal pressure. Both processes have different advantages and disadvantages, with atmospheric heat treatment being the dominant process.
Table 2. Overview of alternative waste heat applications5, 6 Source: AICHELIN HOLDING GmbH
In terms of carbon footprint, atmospheric heat treatment has a weakness due to process gas consumption. To counteract this, the following aspects have to be considered: thermal utilization of the process gas — indirectly by means of heat exchangers or directly by lean gas combustion (downcycling); reprocessing of the process gas (recycling); reduction of the process gas consumption by optimized process control; and use of CO2-neutral media (avoidance). This article focuses on avoidance by optimizing process gas consumption and using of CO2-neutral media.
Typically, heat treatment operations are still run with constant process gas quantities based on the most unfavorable conditions. Based on the studies of Wyss, however, process control systems offer the possibility to adapt the actual process gas savings to the actual demand.7 In a study of an industrial chamber furnace, a 40% process gas savings was demonstrated for a selected carburizing process. In this heat treatment process with a case hardness depth of 2 mm, the previously used constant gas flow rate of 18 m3/h was reduced to 16 m3/h for the first process phase and further reduced to 8 m3/h after 3 hours. Figure 4 shows the analysis of the gas atmosphere, where an increase in the H2 concentration could be detected due to the reduction of the gas quantities. With respect to the heat treatment result, no significant difference in the carburizing result was observed despite this significant reduction in process gas volume (and the associated reduction in CO2 emissions). The differences in the carbon profiles are within the expected measurement uncertainty.
Figure 4. CO and H2/CO concentration at various process gas volumes
Source: AICHELIN HOLDING GmbH
The carbon footprint of the process gas, however, must be fundamentally questioned. In the field of atmospheric gas carburizing, process gases based on Endothermic gas (which is produced by the catalytic reaction of natural gas or propane with air at 1832–1922°F/1000–1050°C) and nitrogen/methanol and methanol only systems have established themselves on a large scale. Methanol production is still mostly based on fossil fuels (natural gas or coal), the latter being used mainly in China. Although alternative CO2-neutral processes for partial substitution of natural gas — keywords being “power to gas” (P2G) or “synthetic natural gas” (SNG) — have already been successfully demonstrated in pilot plants, there are no signs of industrial penetration. Nevertheless, there is a definite industrial scale in the area of bio-methanol synthesis, though so far, purely economic considerations speak against it, as CO2 emissions are still not taken into account.
The question of the use of bio-methanol in atmospheric gas carburizing has been investigated in tests on an integral quench furnace system. A standard load of component parts with a CHD of 0.4 mm was used as a reference. Subsequently, the heat treatment process was repeated with identical process parameters using bio-methanol instead of the usual methanol based on fossil fuels. Both the laboratory analyses of the methanol samples and the measurements of the process gas atmosphere during the heat treatment process, as well as the evaluation of the sample parts with regard to the carbon profile during the carburizing process, showed no significant difference between the different types of methanol. Although this does not represent long-term experience, these results underscore the fundamental possibility of media substitution and the use of CO2-neutral methanol.
Conclusion
Facing the challenges of global warming — intensified by the economic pressure of rising energy costs — this article demonstrates the energy-saving potential in the field of heat treatment. In addition to already established solutions, the possibilities of the smart factory concept must also be integrated in this industrial sector. Thus, heat treatment comes a significant step closer to the goal of a CO2-neutral process in terms of Scopes 1, 2, and 3 regarding emissions under the given boundary conditions.
References
[1] Karl-Wilhelm Wegner, “Werkstoffentwicklung für Schmiedeteile im Automobilbau,” ATZ Automobiltechnische Zeitschrift 100, (1998): 918–927, https://doi.org/10.1007/BF03223434. [2] Wolfgang Bleck and Elvira Moeller, Steel Handbook (Carl Hanser Verlag GmbH & Co. KG, 2018). [3] Wolfgang Köppel, Charlotte Degünther, and Jakob Wachsmuth, “Assessment of upstream emissions from natural gas production in Germany,” Federal Environment Agency (January 2018): https://www.umweltbundesamt.de/publikationen/bewertung-der-vorkettenemissionen-beider. [4] Klaus Buchner and Johanes Uhlig, “Discussion on Energy Saving and Emission Reduction Technology of Heat Treatment Equipment,” Berg Huettenmaenn Monatsh 168 (2021): 109–113, https://doi.org/10.1007/s00501-023-01328-5. [5] Technologie der Abwärmenutzung. Sächsische Energieagentur – SAENA GmbH, 2. Auflage, 2016. [6] Brandstätter, R.: Industrielle Abwärmenutzung. Amt der OÖ Landesregierung, 1. Auflage, 109–113, https://doi.org/10.1007/s00501 02301328-5. [7] U. Wyss, “Verbrauch an Trägergas bei der Gasaufkohlung,” HTM Journal of Heat Treatment Materials 38, no. 1 (1983): 4-9, https://doi.org/10.1515/htm-1983-380102.
About the Author
Dr. Klaus Buchner
Head of Research and Development
AICHELIN HOLDING GmbH
Klaus Buchner holds a doctorate and is the head of research and development at AICHELIN HOLDING GmbH. This article is based on Klaus Buchner’s article, “Reduktion des CO2-Fußabdrucks in der Wärmebehandlung” in Prozesswärme 01-2023 (pp. 42-45).
For more information: Klaus at klaus.buchner@aichelin.com.
This article content is used with the permission of heat processing, which published this article in 2023.
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When processing cemented carbide, there are a few considerations you need to understand to use the proper sintering equipment. One of the biggest factors is the actual material; what is the colbalt content level of the processed material?
In this best of the web article, walk through the steps of dewaxing, sintering for appropriate densification, and the processing temperatures that are required for sintering cemented carbide.
An Excerpt:
“Other than mechanical stresses due to the differential pressure between inside and ambient pressure outside the furnace, operating at relatively high temperatures with high pressure of gas would lead to significant dissipations of heat to the external environment. This is not only anti-economic from an efficiency point of view, but could also compromise the structural integrity of the water-cooled steel vessel of the furnace by overheating it.”
The amazing materials that are produced through additive manufacturing (AM) and 3D machining often require post-processing heat treatments before these become final components that launch into space. What are the trends of AM/3D outside our planet, and what technical resources are available to you as you make one step into this field? This original content piece from the Heat Treat Today editors will help you understand where technology stands in 2024.
Why Does AM/3D Go to Space?
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A broad spectrum of industries have found the appeal of additively manufactured parts, industries ranging from mining to medical and automotive to space. Much of this has to do with complexity of components that new engineering techniques require, the desire to save on material costs, and the ability to condense lead time. For some, additive manufacturing is becoming essential to the space industry; as Tobias Brune, head of the Business Unit Additive Manufacturing at TRUMPF, has commented, “With our 3D printing technology, we are driving the commercialization of the space-travel industry. If you want to be successful in the space-travel industry today, you have to use additive manufacturing.”
When should you expect this transition? Now.
In January of this year (2024), the first metal 3D printer for space was launched to the Columbus module of the International Space Station (ISS). This is a very active, integrated sense of seeing AM in the aerospace industry, and test runs with this equipment will ensue.
Flight model of 3D Metal Printer Launched on NG-20 Source: ESA
The Exploration Company in Europe plans to use 3D printers from TRUMPF (laser specialist) to print core components in engines for spacecrafts. The intent: missions in Earth’s orbit and to the moon.
Heat Treat & thermal Processing Requirements of Post-ProcessingAM
If you are going to get involved in AM, it is essential to have the right equipment. One of the most talked about equipment is hot isostatic pressing (HIP) technology. Often, heat treat operations use HIP equipment for post-process heat treating in order to get the solid part they desire. For the most part, commercial heat treaters have positioned themselves to handle the R&D required to navigate the terrain of overcoming processing challenges of new/complex parts and creating standardizations. However, privateR&D facilities and departments are also building out their capabilities to handle AM in HIP.
However, so also have vacuum furnaces been a key leader in heat treating AM components. Here, commercial heat treaters have also made moves to expand their equipment/process offerings to accommodate AM parts.
So also do atmosphere considerations need to be considered, withgasses like H2 competing trying to capture the limelight.
Continue the Exploration: AM/3D Articles for Space
Looking for an introduction to the AM/3D topic for heat treaters? Begin with this article by Animesh Bose, an engineering pioneer: “The Role Of Heat Treat in Binder Jetting AM for Metals.” The article uncovers the history of one of the most important types of AM/3D manufacturing — binder jetting AM.
Then, take a step over for an industry focus on what “heat treatments for space” look like. Mike Grande eloquently summarized the current processes needed in space in this editorial from the March 2024 Aerospace print edition. Read “The Role of Heat Treatment in Space Exploration” in the digital edition of the magazine.
In-house or commercial? This article presents critical considerations of space components — with a particular emphasis on the importance of AM/3D — when considering how to grow your processing expertise and capabilities. Several examples from the frontlines of R&D are presented by Noel Brady in his article. Read the editorial, “Thermal Processing for Space and Additive Manufacturing,” for excellent illustrations.
Finally, hone in on the topic with a case study about developments in HIP technology for space component post-processing. This article begins with context confronting issues of structural integrity, especially of complex space components, with HIP. Andrew Cassese gets to the case study towards the end of his article, “High Pressure Prepares Parts for Space.”
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Heat Treat Today publishes eight print magazines a year, and included in each is a letter from the editor, Bethany Leone. This letter first appeared in the May 2023 Sustainable Heat Treat Technologies print edition.
In order to create a more sustainable future for heat treaters, operators may be looking to “digitalization” as an immediate step for their heat treat systems. Digitalization is an amorphous term that can describe a few things.
This term tends to be broader than just “digitization” — the act of digitizing analog technologies to digital form — though the two terms are often used interchangeably.
An interest in digitalization makes a lot of sense. For one, updating manufacturing plants with digital practices is a huge draw for young people: “People want to work for a technologically advanced company that they can feel good about,” according to Josh Hale, managing recruiter at International Search Partners, when he spoke on Heat TreatRadio . Additionally, Covid-19 labor constraints accelerated adoption of IIoT (industrial internet of things) technologies — digitalization being just one of many. But there are also several intrinsic promises that digitalization has to offer manufacturers, for example:
Efficiency: creating efficient operations that streamline business processes
Accuracy: increasing accuracy by achieving precise control over temperature, atmosphere, and other process parameters
Data and Analytics: real-time monitoring/data collection and rapid data analysis
Safety: reduced need for manual interventions, thus avoiding accidents and improving operator safety
From a sustainability perspective, digitalization means heat treaters can monitor, analyze, predict, test, and adapt energy efficiencies in their operations. This magazine features a conversation with experts in heat treat with an eye for energy, and they’ve commented on this specific topic. “With higher computational capacity on the controllers on a per furnace basis,” John Clarke, technical director at Helios Electric Corporation notes, “we have the ability to start executing real-time analysis on the furnace and potentially implement a thermodynamic model of the furnace and how it’s operating.” Several representatives from Watlow illustrate this point: “Poor thermal uniformity can lead to scrap and rework of material, which both result in excess energy consumption.” Read the eight-page conversation with six international expert contributors on page 19.
But there are drawbacks to adopting this new technology, and in the midst of all of this “good,” I do wonder how difficult this transition has been — or can be — for some in-house heat treaters. Challenges when considering this technology include:
Initial Investment. The initial investment in new technology is always present, and so is the question of who will “dish out the dough.” Will the furnace supplier try to absorb upgrading expenses? Or does it fall to the end-user buying the furnace or upgrade?
Operational Complexity. However easy to operate a technology is now, it was not always the case. I once thought typing at a computer was the most difficult thing in the world. Now, I’m so familiar with a keyboard that I can look over at my husband texting on his phone and know (to a degree) the message he is typing, just by watching his thumb position. What skills does your team have to learn a new system? How much time will it take to train 50%–75% of them? How long until you feel confident in the process?
Overdependence on Technology. We depend on digital technologies for many things (thank you, alarm clocks!), but is the level of dependence compromising something valuable? And to what degree? When it comes to cybersecurity threats, for example, what type of dependence on technology exposes you to more risk versus fortifying your internal systems?
The promises and challenges of digitalization will continue to face-off in offices and plant floors. While the boundary line of digital acceptance may shift, this new frontier towards creating “a holistic virtual representation of heat treat operations” means new technologies and processes that will be tested and adopted by heat treat pioneers, possibly you.
As with any frontier, there are known and unknown dangers. Let us know how your company is considering digitalization and what opportunities are golden nuggets or simply fool’s gold: editor@heattreattoday.com.
Special thanks to Mike Löpke (head of software & digitalization at Nitrex Metal) and Jeffrey Halonen (CEO of Steelhead Technologies) for their insights.
Bethany Leone, Managing Editor, Heat Treat Today
Contact Bethany Leone at bethany@heattreattoday.com.
A leading heat treat and HIP processing director, Humberto Ramos Fernández has overcome business and technologic challenges to make HT-MX the successful commercial heat treat company it is today.
In this NextGen profile on Heat Treat Radio — with host and Heat Treat Today publisher, Doug Glenn — we’re learning the heart of an engineer, from early education and metallurgy interests to cycling and how-to-start-a-business.
Below, you can watch the video, listen to the podcast by clicking on the audio play button, or read an edited transcript.
The following transcript has been edited for your reading enjoyment.
Meet Humberto (00:00)
Doug Glenn: Well, welcome everyone to another Heat Treat Radio episode. We have the great privilege today of having another one of our 40 under 40 award recipients here to tell us a bit about himself.
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So, Humberto, I would like for you to tell us your name and tell us a little bit about your upbringing. Where were you educated, for example?
Humberto Ramos Fernández: My name is Humberto Ramos Fernández. I'm born and raised here in Chihuahua, Mexico. I've spent my whole childhood living here, and when I went to college, I moved to , Mexico, had my degree there, and then spent a few years working around there. For a little while, I lived in Houston, Texas. I also lived in Australia for a little bit. I spent a few months in Argentina as well, and then got back to working in Monterrey, and eventually moved back to Chihuahua, where I'm currently living. I am very happy to be here, actually.
Doug Glenn: Do you have a family? I know you have parents, obviously. But married, kids, the dog, a cat. What do we have actually?
Humberto Ramos Fernández: I am actually engaged. I am about to get married in September later this year.
Humberto shares about coming from a family of engineers.
Doug Glenn: Congratulations! Very nice, very nice. Yeah, best to you. That's great.
What was it that first made you think about metallurgy or heat treatment, that type of stuff?
Humberto Ramos Fernández: Well, I always knew I would want to be an engineer. My dad's an engineer. My brother is an engineer. Since a very young age, I've always been into cars and racing and stuff like that. So, engineering and mechanical engineering was kind of an obvious choice for me when deciding my degree after high school.
I never really thought of metallurgy as a career; it was kind of more of a business choice or business decision. When I started as a mechanical engineer I was very interested in the mechanical aspect of the parts and design more than the metallurgy.
But eventually, while still working in Monterrey, I had the opportunity to come back home in Chihuahua and visit for a weekend. I got submerged in the environment of business leaders where there were a lot of opportunities for businesses — one of those was heat treating.
That's when my real interest in it started. It's been around 13 years or so since then. I've learned a lot. I mean, there's a lot to learn yet.
But I'm happy in what I'm seeing and what I'm learning.
"The decision to go into metallurgy and heat treat adventure was a decision I made alongside my dad. You know, we decided that this was a good business opportunity for both of us."
- Humberto Ramos Fernández
Doug Glenn: I do want to mention that besides being one of Heat Treat Today’s 40 Under 40 recipients, you've also authored a couple of articles with us as well. Obviously you're learning. It's been going well, and you've been contributing, giving back to the industry, which is really good.
Family (05:20)
What did your family think of your decision to go into heat treatment and metallurgy?
Humberto Ramos Fernández: The decision to go into metallurgy and heat treat adventure was a decision I made alongside my dad. You know, we decided that this was a good business opportunity for both of us. Even though he's never been involved in the day-to-day operations, he's been very supportive, and he's the actual president of the board at HT-MX.
We started this business together, and he's been with me all the way. We've had some very dark periods within the last 10 years. Pretty much everything that could happen did happen — a pandemic and multiple industry crises and everything.
He's been very supportive. One of the main reasons we've had some success, and I've been able to lead this company through some hard periods is because of his support and his knowledge. It's a very valuable thing to have, and I'm very grateful for sharing the experience with him and still having him give so much.
HT-MX (07:04)
Doug Glenn: Tell us a little bit about HT-MX. I don't think we've really mentioned it in particular. Did it exist before you started, or did you start it from scratch?
Humberto Ramos Fernández: After I graduated as a mechanical engineer, I got a job at GE Oil & Gas. I worked at this facility where we were manufacturing and oil and gas equipment. I spent a couple of years there. I learned a lot on the engineering side of it.
I got to work in the corporate offices in Houston, TX, for a while, and this led me to realize that there were a lot of supply chain gaps in the Mexican industry. There were heat treaters, but none like the ones we were looking for from the quality side of the requirements.
Being from the engineering side of things, I would visit some of these suppliers and realize that there were opportunities everywhere for more .
While that was happening, there was this pretty cool idea here in Chihuahua: A group of businessmen got together and organized a visit “from Chihuahua to Chihuahua,” trying to understand all the manufacturing happening here. A lot of people didn't really know. Over here, there are four OEMs. There's aerospace OEMs. There's a Ford engine plant. There's a lot of industry happening here. They defined several supply chain gaps, and one of that was heat treatment.
One weekend I was here visiting my parents, and we got to talk about the potential opportunities. We just decided to go for it. We started the company officially in 2010, 2012. We've been operating since.
We have a business partner as well. And I think we made a pretty cool team. And you know, we've survived a lot of things throughout this.
What Is the Most Enjoyable Part of HT-MX? (10:04)
Doug Glenn: What's been the most enjoyable part? What do you really enjoy about it?
Humberto Ramos Fernández: I really enjoy whenever we have and then trying to translate that into an actual service — looking at the potential growth and the equipment requirements and the pyrometry and all that.
I think that's what we take a lot of care for at HT-MX, and I think that's one of the parts I enjoy the most.
Also, you know, just walking through the shop and seeing the furnaces — the floor being clean and organized. That’s just relaxing at some point.
“After lunch I used to drive around some of the old neighborhoods where there's these machine shops, and a single part gear or a shaft, and then go and do the heat treatment. And now we're doing hot isostatic pressing for airplane engine parts.”
Doug Glenn: It's got to be relatively satisfying for you to know that you started from zero.
Humberto Ramos Fernández: When we started, during the first few months, after lunch I used to drive around some of the old neighborhoods where there's these machine shops, and a single part gear or a shaft, and then go and do the heat treatment. And now we're doing hot isostatic pressing for airplane engine parts. So that's a big jump, you know.
It’s very satisfying. But at the end of the day, we still have a lot of challenges and a lot of things to do. So it's never about focusing on what we've already done, but what can be done and what lies ahead.
A bigger business also brings extra worries, you know.
More About HT-MX (11:58)
Doug Glenn: Little business, little problems; big business, big problems. Not a lot of people in the world have built a business from the ground up, so I'm sure it's worth taking some time, and just acknowledging that accomplishment.
So how furnaces? How many HIP units? How many employees do you have?
Humberto Ramos Fernández: Since the pandemic we went through an evolution. We refocused our company and became much more focused on the aerospace industry.
We were running high volume, automotive parts, and oil and gas parts. Since the pandemic and the increase in energy prices and a lot of the inflation issues that we had here in Mexico — especially with the energy costs — we were forced to focus on what we believe is the real volume behind a heat treatment. Which is, in my opinion, the engineering of aspect of it.
We started focusing on these clients where their requirements were higher and where we would be able to better service them with what we had. So, we refocused. We're currently running around eight furnaces and one HIP unit.
We’re expecting to add a couple of furnaces this year and we're in the process of adding a couple of other additional services.
So, we're growing. We kind of moved away from the high volumes work, and we're focusing more on more aerospace industry and work.
Top Industry Resources (13:55)
Doug Glenn: What are some of the resources that you use to help yourself stay well informed?
Humberto Ramos Fernández: I guess the Internet, obviously.
Heat Treat Today is one of the main sources. There are other sites out there where heat treatment is focused on that I follow. And I talked to colleagues. I'm very involved in the aerospace cluster here in Chihuahua, also in Aerospace Federation in Mexico, and with the Chamber Commerce in Chihuahua — also federally in Mexico as well.
Nowadays with the Internet, and all that kind of stuff, there's a lot of information around. The key aspect is to kind of know how to filter the good info from the bad info.
“We started focusing on these clients where their requirements were higher and where we would be able to better service them with what we had. So, we refocused. We're currently running around eight furnaces and one HIP unit.”
- Humberto Ramos Fernández
Rapid Fire Round (14:56)
Doug Glenn: Let me ask you a couple of rapid fire questions, just to kind of get to know you a little bit more as a person, if you don't mind.
Are you a Mac or Apple user, as far as your computer goes? Or are you a PC guy?
Humberto Ramos Fernández: No, I'm an Apple user.
Doug Glenn: Is that right? You have an Apple computer.
Humberto Ramos Fernández: Yeah, I'm actually on an Apple computer right now.
Doug Glenn: Are you more of a digital person? Do you like hard copy print, or digital, or both, or neither?
Humberto Ramos Fernández: I grew up reading physical magazines, and I still really enjoy car magazines and stuff like that. But other than that, books and podcasts and all, it's on digital.
Doug Glenn: So I don't know if this applies so much to you, because you own the company. Do prefer a flexible work schedule or a high paying job? Being the owner of the company, you have neither, so maybe you would take either.
Humberto Ramos Fernández: I'll take whatever I can get. I think that the flexibility is a very, very valuable part of any kind of work. And I try to offer that to the people that we work with. But also, you need to have high pay to retain the good employees and the good engineers. We are trying to balance both.
Doug Glenn: Tell me about your car passion. Are you still doing anything with your car passion here? You like car magazines and stuff like that?
Humberto Ramos Fernández: I have a couple of old cars I like to work on. I work with my brother on restoring as well. I still keep that passion going. It's something that I really enjoy.
Doug Glenn: So you gotta tell us: What's the 40 year old car?
Humberto Ramos Fernández: It's a 1983 BMW 320I.
Humberto’s big interest is working on old cars, especially a 1983 BMW 320I.
Doug Glenn: If you could travel somewhere else that you haven't already been, where would you go, and why?
Humberto Ramos Fernández: I haven’t been to Japan. And I would love to experience the culture. I feel fascinated by their history and their culture and even their food. So that would be one of my first options.
Doug Glenn: What was it about Japan in the past that caught your attention?
Humberto Ramos Fernández: Those kind of cultures that are so radically different from what we experience here in Latin America are very interesting to look at and to visit.
I've been through China. I've been through other Asian countries. And you know I've been through some other countries in Europe. So considering that I've never been, never been there I would definitely choose Japan.
Doug Glenn: What do you do with your free time? Assuming you have any?
Humberto Ramos Fernández: I like to spend my weekends cycling. I do a lot of road cycling as well. Endurance sports, mostly cycling. So recently, I've done a lot of long, long days out there on the bike. I love the weather here, and here in Chihuahua, we're close to some very nice mountains and the canyons are absolutely beautiful places to go and visit on your bike.
Doug Glenn: What’s your favorite app on your phone or movie or magazine?
Humberto Ramos Fernández: My favorite movie I think it would be the Shawshank Redemption.
Doug Glenn: What future plans do you have for your company and life? Obviously, I know you're getting married. So that's one. But company life, generally speaking, what are you looking forward to?
Humberto Ramos Fernández: I'm looking forward to a period of continuous growth in the company, and where we can stabilize the operation and allow me to explore new and bigger opportunities within the heat treatment industry. I think there's a lot to be done here, and I think as a country and as a state, we're coming into a very good period of time.
Personally, I feel optimistic of what we can achieve here, and that still drives me every day to try and improve our company and continue to learn and to establish ourselves as a reliable and valuable heat treater for our clients.
Doug Glenn: That's great, Humberto. It's been a real pleasure to talk with you. Thanks for spending some time with us.
About the Expert
Humberto Ramos Fernández is a mechanical engineer with a master’s degree in Science and Technology Commercialization. He has over 14 years of industrial experience and is the founder and director of HT-MX Heat Treat & HIPing, which specializes in Nadcap-certified controlled atmosphere heat treatments for the aerospace, automotive, and oil and gas industries. With clients ranging from OEMs to Tier 3, has ample experience in developing specific, high complexity secondary processes to the highest requirements.
What is the most common scenario for a eutectic reaction? And (for that matter) what constitutes a eutectic reaction?
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If your heat treat operations involves vacuum heat treatments, you may already be familiar with this term. With the ability to truly make a bad day worse, this paper uncovers several examples of eutectic reactions, the costs that this “metallurgical experiment” can have on your load and furnace, and what steps you should take to prevent two mating metals from melting together. In this best of the web article, read about the eight examples of how barriers are used in real-world applications.
An excerpt: “To many people, the term ‘eutectic’ is not well understood. The best way to think of a eutectic is a metallurgical meltdown. A eutectic reaction occurs when two components with different melting points and surfaces free of oxides come in contact with each other in the vacuum furnace. This can create an atomic diffusion. For some materials, when a specific atomic composition is reached, they will melt at a temperature much lower than the melting point of the individual metals. If that temperature is reached or exceeded during the heat treating cycle, melting will occur at the contact points. This is referred to as a eutectic melt.”
2024 is a big year for heat treaters who work for the DoD.AsJoe Coleman, cybersecurity officer at Bluestreak Consulting, explains, Controlled Unclassified Information is a key topic you need to understand if you want to maintain or grow contracts with the DoD this year.
This Cybersecurity Corner installment was released in part inHeat Treat Today’s March 2024 Aerospace print edition.
If you are a prime contractor for the Department of Defense (DoD) or a subcontractor, then you have CUI in one form or another whether it is in paper or digital format. Learn what is, and is not, considered Controlled Unclassified Information (CUI).
What Exactly Is Considered CUI?
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The DoD handles CUI in many forms across its operations. CUI includes sensitive information that requires safeguarding but does not meet the criteria for classification as classified information. Examples of DoD CUI include:
Click image to download a list of cybersecurity acronyms and definitions.
Export Controlled Information (ECI): Information that is subject to export control laws and regulations, such as technical data related to defense goods and services.
For Official Use Only (FOUO): Information that is not classified but still requires protection from unauthorized disclosure for official government use.
Critical Infrastructure Information (CII): Details about critical infrastructure elements like facilities, systems, networks, and assets that are essential for national security, economy, or public health.
Privacy information: Personal information of individuals (e.g., Social Security numbers, medical records) that needs to be protected under privacy laws and regulations.
Sensitive But Unclassified (SBU) Information: Information that, although unclassified, is sensitive and requires protection due to its potential impact if disclosed.
Contract-related information: Non-public details within contracts, such as proprietary information, financial data, or technical specifications.
Proprietary information: Data owned by an entity and protected by intellectual property rights or confidentiality agreements.
In the heat treating industry, DoD CUI might include various sensitive details related to heat treatment processes, materials, or specifications used in defense-related applications. Here are some potential examples of DoD CUI within the heat treating industry:
Material specifications: Specifications for heat treated materials used in defense equipment, weapons systems, or components. This could include details about specific alloys, heat treatment methods, tempering, or hardening processes required for certain applications.
Process documentation: Detailed procedures and technical information regarding heat treatment processes employed in the production of defense-related materials or components. This might involve specific temperature ranges, cooling rates, or other proprietary methods used in heat treating.
Quality control data: Information related to quality control measures specific to heat treating in defense-related manufacturing. This could involve data on testing methodologies, inspection techniques, or standards compliance for heat treated materials used in critical defense systems.
Research and development (R&D) information: Research findings, experimental data, or proprietary knowledge related to advancements in heat treatment technologies tailored for defense applications. This may include innovative heat treatment methods for enhancing material properties, durability, or performance in defense systems.
Supplier information: Details about suppliers providing heat treatment services or materials to the defense industry, including contractual agreements, proprietary processes, or specifications specific to DoD projects.
Cybersecurity measures: Information about cybersecurity measures employed within heat treatment facilities that handle DoD contracts or projects to safeguard sensitive data from cyber threats.
Facility security protocols: Details regarding security protocols, access controls, and clearance requirements within heat treating facilities handling defense-related projects to prevent unauthorized access to sensitive information.
Other items that may be identified as CUI provided by the DoD or generated in support of fulfilling a DoD contract or order include, but are not limited to (in both paper and digital formats):
Research and engineering data
Engineering drawings and lists
Technical reports
Technical data packages
Design analysis
Specifications
Test reports
Technical orders
Cybersecurity plans/controls
IP addresses, nodes, links
Standards
Process sheets
Manuals
Data sets
Studies and analyses and related information
Computer software executable code and source code
Contract deliverable requirements lists (CDRL)
Financial records
Contract information
Conformance reports
What Is Not Normally Considered CUI?
Here are several examples of items that may not typically fall under DoD CUI for the heat treating industry:
General industry standards: Information related to commonly accepted industry standards, processes, or procedures that are widely available and not specific to defense-related applications.
Non-proprietary heat treatment techniques: Basic information about standard heat treatment methods or techniques that are publicly known and not proprietary to a particular organization or application within the defense sector.
Publicly available research: Scientific or technical research findings, publications, or data that are publicly accessible, not subject to proprietary rights, and not specifically tied to defense-related advancements.
Commonly shared best practices: Information regarding widely accepted best practices in heat treating that do not involve proprietary or classified techniques applicable solely to defense-related materials or components.
Non-sensitive business operations: Routine business operations, administrative documents, or general non-sensitive communications within the heat treating industry that do not pertain to defense contracts or projects.
Information approved for public release: Data that has been officially approved for public release by the DoD or other relevant authorities, ensuring it does not contain sensitive or classified details.
Basic material specifications: Information about materials, alloys, or heat treatment processes widely used in commercial applications and not specifically tailored or modified for defense-related purposes.
I hope this information has been helpful to you. Please contact me with any questions and for a free consultation, with a complimentary detailed compliance ebook.
For more information: Contact Joe Coleman at joe.coleman@go-throughput.com.
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The search for sustainable solutions in the heat treat industry is at the forefront of research for industry experts. Michael Stowe, PE, senior energy engineer at Advanced Energy, one such expert, offers some fuel for thought on the subject of how heat treaters should prioritize the reduction of their carbon emissions by following the principles of reuse, refuel, and redesign.
This Sustainability Insights article was first published in Heat Treat Today’sJanuary/February 2024 Air & Atmosphereprint edition.
Reduce
Michael Stowe PE, Senior Energy Engineer Advanced Energy
We explored why the question above has come to the forefront for industrial organizations in Part 1, released in Heat Treat Today’s December 2023 print edition. Now, let’s look at the four approaches to managing carbon in order of priority.
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The best way to manage your carbon footprint is to manage your energy consumption. Therefore, the first and best step for reducing your carbon footprint is to reduce the amount of energy you are consuming. Energy management tools like energy treasure hunts, energy assessments, implementation of energy improvement projects, the DOE 50001 Ready energy management tool, or gaining third party certification in ISO 50001 can all lead to significant reduction in energy consumption year over year. Lower energy use means a smaller carbon footprint.
Additionally, ensuring proper maintenance of combustion systems will also contribute to improved operational efficiency and energy savings. Tuning burners, changing filters, monitoring stack exhaust, controlling excess oxygen in combustion air, lubricating fans and motors, and other maintenance items can help to ensure that you are operating your combustion-based heat treating processes as efficiently as possible.
Reuse
Much of the heat of the combustion processes for heat treating goes right up the stack and heats up the surrounding neighborhood. Take just a minute and take the temperature of your exhaust stack gases. Chances are this will be around 1200–1500°F. Based on this, is there any effective way to reuse this wasted heat for other processes in your facility? One of the best things to do with waste heat is to preheat the combustion air feeding the heat treating process. Depending on your site processes, there are many possibilities for reusing waste heat, including:
Space heating
Part preheating
Hot water heating
Boiler feed water preheating
Combustion air preheating
Refuel
Once you have squeezed all you can from reducing your process energy consumption and reusing waste heat, you may now want to consider the possibility of switching the fuel source for the heat treating process. If you currently have a combustion process for a heat treat oven or furnace, is it practical or even possible to convert to electricity as the heating energy source? Electricity is NOT carbon free because the local utility must generate the electricity, but it typically does have lower carbon emissions than your existing direct combustion processes on site. Switching heating energy sources is a complex process, and you must ensure that you maintain your process parameters and product quality. Typically, some testing will be required to ensure the new electrical process will maintain the metallurgical properties and the quality standards that your customer’s specific cations demand. Also, you will need a capital investment in new equipment to make this switch. Still, this method does have significant potential for reducing carbon emissions, and you should consider this where applicable and appropriate.
Redesign
Finally, when the time is right, you can consider starting with a blank sheet of paper and completely redesigning your heat treating system to be carbon neutral. This, of course, will mean a significant process change and capital investment. This would be applicable if you are adding a brand-new process line or setting up a new manufacturing plant at a greenfield site.
In summary, heat treating requires significant energy, much of which is fueled with carbon-based fossil fuels and associated-support electrical consumption. Both combustion and electricity consumption contribute to an organization’s carbon footprint. One of the best ways to help manage your carbon footprint is to consider and manage your energy consumption.
For more information: Connect with IHEA Sustainability & Decarbonization Initiatives www.ihea.org/page/Sustainability Article provided by IHEA Sustainability
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