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friction forged knives

friction forged knives

Steel exhibits polymorphism characteristics, that it, it can exist in different states from a fine-grained, super hard and brittle material, to one more ductile and coarse grained. Thanks to Keith Coleman, Paul Bruno, Lotiel Vardamir, and Lennart Palkovits for becoming Knife Steel Nerds Patreon supporters! The primary benefit of rapid cooling (quenching) is that the higher HRc values are obtained (65 to 68); yet because the grain size is so small and thus tougher and stronger, the brittleness normally observed in steel taken to these high HRc values does not occur. Thus far all published numbers on very high hardness steel show relatively low toughness. The reason is because each “cut” is both a forward and backward stroke, so the first half-cut wears the edge which leads to less cutting in the second half. The same holds true for a steel blade. The performance in the tests as shown above clearly shows that the Friction Forged® D2 blade cuts more material at lower forces for more strokes than any of the competitors. Do your own testing. If sharpened, all would have extremely sharp, hard edges but will not stand much transverse force. sterlingsaddleryandleather@yahoo.com There are no quantitative toughness comparisons between FSP and conventionally hardened D2 but gross chipping and poor toughness have not been reported. But to be honest with you I am so glad to be free from their religious type of thinking that throws the facts away in favor of their assumptions, speculations and estimations…all of which are readily provided for them by the industry. This is important as it highlights potential biases, both in the work and his own…. The thinner edges of Phil’s knives also have an advantage. They claimed that, “Rope was used instead of CATRA test media because the CATRA test media was too aggressive, and not indicative of the typical use of outdoor knives.” Here are the reported results of their CATRA testing: The amount of rope cut in the first cycle was significantly more with the FSP processed D2. So how do they make sure our products don’t last and keep us coming back to buy more steel. If a high degree of toughness is combined with high hardness, that tool or knife is capable of performance we never thought possible, is nearly indestructible, and will last for a very long time. If quenched from the transformation temperature quickly (less than 10 seconds), and under controlled temperature/time schedules, the pearlite transformation is “frozen” out, and the austenite becomes fine-grained, hard martensite. Tests are conducted before, during and after abrasion testing. A friction folder is a folding knife that doesn’t use a lock or springs. Despite the sXXv series of steel outperforming traditionally forged D2, they came nowhere near the Friction Forged D2. The higher the HRc values, the better the cutting performance and edge longevity—as long as the brittleness issue is managed as it is with Friction Forging®. Thus another measure of a high performance blade is one that has a softer tough spine and a very hard edge that is not so brittle as to chip in normal use. 1-2 (2013): 863-877. Now repeat the process at progressively higher temps. . Friction Forging® does not involve a “mystery”, or “secret steel”. “Friction-stir processing of AISI 440C high-carbon martensitic stainless steel for improving hardness and corrosion resistance.” Journal of Materials Processing Technology 277 (2020): 116448. See more ideas about Friction folder, Folding knives, Knife making. Knife blades have been forged for thousands of years, using hand-held hammers, power hammer mills, or some other pressure exerting force. “Friction stir processing of D2 tool steel for enhanced blade performance.” In TMS Annual Meeting, pp. Especially when one considers how vastly important it is. These … I work with metals and composites all day. - Duration: 4:11. WOW !!! Using a predictive equation for edge retention described in this article, I would estimate a 30% improvement in edge retention by increasing the hardness from 60 to 68 Rc in D2. I know the two are very different in hardness at the edge. The shingle test did not show that the friction forged D2, D2 and S30V had any advantage over the other. One more comment on normalizing. Knives of Alaska Press Release Tejon Ranch, California, USA - May 8, 2007: Knives of Alaska President, Charles E. Allen announced the formation of DiamondBlade LLC to manufacture extreme performance Friction Forged… Friction Stir Processing (FSP) is a process whereby high friction is used to generate heat and to deform steel to refine the microstructure, harden the steel, and improve properties. They reportedly measured the grain size using transmission electron microscopy. To the contrary, Friction Forging® involves metallurgical, chemical, and engineering facts gained from years of research performed at MegaDiamond, Advanced Metal Products, DiamondBlade, Knives of Alaska, universities and other companies. The following graphs demonstrate the superiority of the Friction Forged® blades compared to other traditionally processed steels. Furthermore, when any dare to even mention the word “Super Quench” on some forums, they can be immediately banned…yet it’s perfectly fine to mention “water” and “brine” as a possible quenchant even though they’ve both continue to crack blades since the invention of steel. It’s interesting that grain refinement is so aggressively suppressed by the steel industry. The carbide structure and high hardness would lead to “good” at best toughness. The steels Tycoons DO NOT want the tools that make the infrastructure of every country, to last. You ought to try it some time…who knows, you might even find out it’s a better product than Parks #50 ?? When friction stir processing steel, the high heat that is generated in combination with rapid cooling leads to a process similar to hardening steel: the steel is “austenitized” and quenched to form hard martensite. It’s very basic and simple. 90 We as knife makers, do not want your assumptions and calculations. Differential heat treatments (soft spine, hard edge) are difficult to achieve with conventional methods on high alloy steels like D2. I also pointed out that the differential heat treatment is difficult to perform with other methods and is a benefit of FSP. They use conventional D2 tool steel and process the edge so that it has hardness of around 65-69 Rc and a spine at 38-42 Rc. Higher wear resistance of FSP D2. The next best material, S90V, was reduced to cutting only 0.2 inches per stroke at about 75 inches of total media cut. Thus, the finest knives in the world will have a fine-grained and hard, but not brittle, edge and they stay sharp longer—much longer! I applaud DiamondBlade Knives for their aptitude and willingness to pursue new technology inspite of journalistic persecutions and to tap into the so far, unused potential in today’s knife steels. Notify me of follow-up comments by email. forged old file some exotic wood overall 260mm lock holds in itself very firmly looking for a new owner price: 200$ + shipping Carpe diem Cool Knives Knives And Tools Knives And Swords Forging Knives Blacksmithing Knives Friction Folder Hand Forged Knife Dagger Knife Handmade Knives Even the most inexperienced knife maker knows, by real world testing, that grain refinement significantly enhances and improves toughness in knife steels, yet you down-played the importance of it. Figure 3: ERT sharpness as a function of the number of strokes cut in the ERT media. Clearly the Friction Forged blade keeps its sharp edge longer. Everything goes good if a knife maker stays in his box and doesn’t make waves or ruffly feathers. I think that FSP blades look decent, and they do look like they refined the primary chromium carbides just a little bit. -blade is friction forged D2 -edge is 0.030" thick, 14-15 dps -blade is 0.105" thick, 2.57" long -weighs 2.5 oz. His custom knives were thinner behind the edge: 0.01″ compared with 0.015″. The process is designed to work without melting of the materials. Number of … Larrin is beholden to no one, he is fully supported so he can speak freely and share. He tested with a hunting knife that has a behind the edge thickness of 0.015-0.017 inches. I've come across tons of "miracle processed" steels, but this one was … If all you have is Parks #50, it will probably get you by in a pinch…but if at all possible I would suggest “Super Quench”. Hi Clay, I will take your criticisms in order. This was a comparison with only one hardening temperature with the 420 and harder is possible. What is forging? Friction Forged Knives. If for some strange reason he starts to think for himself, then he gets his hands slapped by the Moderator or one of the big name knife makers on the site. Thank you for the message. At such high hardness the toughness of D2 is not expected to be very high, and I wouldn’t think that grain refinement would significantly change that. These are relatively small improvements. The knives are advertised as having a finer grain structure than powder metallurgy stainless steel and superior edge retention, toughness, and sharpness than knives tested in 12 other blade steels including S90V. The combination of thousands of pounds of forging force, tool rotation, and temperatures above the transformation temperature produces dramatic reductions in grain size. Sincerely Holy Wall of Text Batman, wow pretty rude stuff you put in there Clay. Furthermore I was appalled at the casual contempt you showed in your article for the many years of scientific research and the controlled testing, and the indisputable contribution that Cliff Stamp has made to the knife community. [1] https://www.diamondbladeknives.com/FAQ. [8] Dodds, S., A. H. Jones, and S. Cater. It’s all about money. “Solid state processing of hand-held knife blades to improve blade performance.” U.S. Patent 8,186,561, issued May 29, 2012. So I am going to detail the process used to produce the knives and what the properties of the steel likely are. When blades are heated above the transformation temperature and held there for a period of time, the grain structures become finer, alloyed and chemically homogeneous with the desired elements. As you move up in hardening temps, and get more alloy into solution, you will find that the necessary quench speeds slow down drastically till you hit the upper hardening temps and only need to plate quench. The FSP D2 is very similar to the CPM-154 and CPM-D2 in terms of level of wear resistance apart from the significantly higher hardness. With all due respect Mr Thomas, you owe DiamondBlade Knives, Phil Wilson, and Cliff Stamp a public and formal apology for a negative review on a positive product that you obviously never tested yourself and have no experience with. The area immediately above the Friction Forged® zone is in the mid 50’s HRc and the remainder of the blade is engineered to have a lower HRc value of 45 thus providing a tough, slightly “springy” blade that resists breakage under extreme conditions. Historically, the very best blades have the fine-grained, hard, superior edge holding characteristic that, through tempering, has removed the “brittleness” from the edge. You can read about how grain refinement improves properties here. By 125 inches total media cut, the S90V was cutting only about 0.15 inches per stroke. HAS FINEST GRAIN STRUCTURE: Measured with Transmission Electron Microscope (TEM) and Scanning Electron Microscope (SEM) micrographs, Friction Forging® has been proven to create “nanosized” superfine grain structures. This prevents edge degradation due to corrosion. Good evening Nope In other words, the steel is not as prone to develop cracks and chips in a mosaic of fine-grained as opposed to coarser grained material. The machine measures how sharp the blade is by recording the maximum force required in Newtons to cut into a piece of silicone test media. There is a lot more to be said and other things to consider but my advice to all knife makers is: GET OUT OF THE BOX and use the brain power God gave you. Thank you kindly for the message. This article (and others) are largely based on your assumptions, suspicions, thermal calculations, opinions, simulations, estimates, and just plain guesses. Knives And Tools Knives And Swords Friction Folder Knife Template Best Pocket Knife Edc Knife Straight Razor Tactical Knives Today we welcomed 168 new members to the #ACAlumni community. It’s not completely clear if friction stir processing leads to an increase in hardness relative to what is possible with conventional hardening. I wrote several positive things about the specialized steel processing. DiamondBlade's Friction Forged blades are probably the most significant legitimate improvement in the knife industry in over 40 years. Ordinary D2 lasts for about 15 strokes. Friction Forged Knives The company DiamondBlade Knives produces knives with friction stir processed (FSP) edges [1]. They also reported that the grain size of powder metallurgy S30V steel is 2-5 microns. Sign … The composition was 0.45C and 13.7Cr, very similar to the 420HC used by Buck Knives which is reportedly hardened to 58 Rc [9], which also includes a tempering step unlike this study. Anybody can do this simple experiment in their shop: Cut off a piece of 1/8″ D2 (2″ x 6″) soak it in your oven for 30 minutes, slightly above critical, at 1575 degrees, and SQ it. Your email address will not be published. Take Care and have a pleasant evening. The Friction Forging® is performed on the knife blade in the area that will eventually become the edge. The fact that the Diamondblade knife still outcut the others despite the thickness disadvantage is relatively impressive, which is why I pointed it out. It is hard to say. Extreme examples are flint, ceramic and glass. When forging is performed in conjunction with the proper heat treatments termed, Blades that are uniformly hard throughout are more brittle and will break rather than flex when significant transverse loads are exerted. The Forged in Fire Stainless Steel Chef and Paring Knife Set is a tough and reliable cooking tool that make easy work of any delicacy. At a time when Robb Gunter should be nominated and inducted into the knife makers Hall of Fame for his expertise and contribution to the steel industry …but instead his hard work and expertly formulated “Super Quench” is continually and repeatedly bashed and trashed on most knife forums. The normalizing temperature for highly spheroidized 52100 is 1900 degrees f (or even higher) for 20-30 minutes. “Enhancement in hardness and corrosion resistance of AISI 420 martensitic stainless steel via friction stir processing.” Surface and Coatings Technology 357 (2019): 339-347. I wanted to thank you for allowing me the privilege to post comments on your site. When you reach the temperature that the required speed of the quench doesn’t change anymore, then that’s the right temperature you need to normalize at. Cool Knives Knives And Tools Knives And Swords Friction Folder La Forge Forged Knife Survival Weapons Edc Knife Edc Gear Instagram post by Rylan, Host of TheKnifeClub • Jun 20, 2016 at 7:57pm … The 440C is a bit smaller than the other reports, though the conventionally processed steel was measured as only 2 microns which seems too fine so the measurement method is perhaps in question. Over the years, the design has adapted to feature an extended … The toughness of Friction Forged D2 is reported to be good, though the experimental evidence of this is somewhat limited. 5) I am being overly critical of Diamondblade knives. All processes are done by myself in my home/shop. Is this how H1 steel is hardened? A study cited in the previous grain size section found 2.3 micron grain size for FSP D2 which sounds more reasonable so I wonder if they are indeed able to get the grain size down to 0.5 microns. This introduction to Friction Forging® will cover the technical aspects and terms of what makes a good blade and how we create a “Super Blade” through Friction Forging®. Good evening Shawn Slip joint knives have a spring mechanism that holds the spine of the blade in place. Here is another interesting statement in your article: “At such high hardness the toughness of D2 is not expected to be very high, and I wouldn’t think that grain refinement would significantly change that.” That statement has two assumptions (“is not expected to be” and “I wouldn’t think”) and a bald-faced lie. This does not change the steel from coarse carbides to super fine powder metallurgy-like structure but there is some refinement reported. This is similar to hardness measurements of D2 I have taken with different heat treatment parameters, though I used cryo after quenching. The third machine tests a blade’s strength by resting a blade against a fixed stainless steel rod at an 18-degree angle. They shared a micrograph of the TEM imaging but it is very high magnification so it is hard to tell what the average grain size would be. Any normal person can educate themselves on any given subject and no longer be ignorant. The quench is a technique of cooling the blade in still air, circulated air, oil or other quenchant. I also wanted to thank you for the many informative articles and helpful information you have given to the knife community. However, stupidity is incurable and can not be fixed. Different edge angle. Friction Forged® D2 High Carbon Tool Steel Blade Bevel 4.5 wedge grind with a 16-18 sharpened bevel Blade Style Drop Point Blade Length 4.00" Overall Knife Length 9.250" Weight 4.5 oz. Performance Forged in Steel: How DiamondBlade Knives are made! I’m not against knife forums as there is a lot of good information there and I have learned much from them. This was higher than the two austenitizing temperatures used for conventional hardening (1000 and 1200°C). Does it not concern you of the possible loss of business to these three parties due to the negative slur and biased undermining of a product you have never personally tested and have no experience with ?? Grain refinement relates directly to toughness and toughness is the missing ingredient in most high carbon knives made today. 10 $54.99 $54.99 The high temperatures and deformation lead to more carbide dissolution and high carbon in solution leading to high retained austenite [10]. What I found instead was repeated phrases like: “…so I don’t think…”, ” I believe…”, “…is probably due to…”, “So it appears…”, “…seems…”, “…perhaps”, “…doesn’t seem likely”, “I assume…”, “…is suspect”, etc. Friction stir processing is used to improve properties in a processed zone without welding anything. I challenge anyone to call the metallurgists and engineers responsible for the different “melts” in the steel mills…and strike up a conversation about grain refinement in high alloy steels. TEST EDGE STRENGTH AND EDGE SHARPNESS: Three different type machines were employed to test blades. In Figure 2, we see how much rope can be cut without losing shaving sharpness. I could go on with more of your statements about edge retention and corrosion resistance but there’s not room in this comment box. [16] http://www.cliffstamp.com/knives/evaluations/alpha_1.html, Hi Larrin A review of the studies on FSP with tool steel and what … Their email inbox should be flooded with questions on how to get these same advantages of GR in their own shops. At these high temperatures, when the blade steel grain structures are transformed to a very fine state, it is referred to as austenite. I think cost had a thing to do with some of this limitations. In addition, the knife-edge is less prone to deform (dull) when that edge has a hard and fine-grain structure. SAME GEOMETRY: When testing, test blades must be of the EXACT same edge and overall geometry. [5] Pan, L., C. T. Kwok, and K. H. Lo. I would like to know what factual evidence led you to make this statement: “Perhaps the FSP D2 did no better with the cardstock leading to them looking for an alternative.” This statement is pure assumption (with a negative slur) as you gave no proof whatsoever that this was actually the case. :  Total media cut as a function cumulative REST sharpness, : ERT sharpness as a function of the number of strokes cut in the ERT media, LEARN ABOUT DIAMONDBLADE'S REVOLUTIONARY FRICTION FORGING® TECHNOLOGY. The first is a machine made by CATRA (Cutlery & Allied Trade Research Association) that is called a “Razor Edge Sharpness Tester” (REST). If an “idiot” like me can figure out some of these things, then what could somebody do that actually had some common sense and aptitude ?? Accepting otherwise would require much greater evidence than has been provided. So what is it, that they don’t want us to know “? But even after 1000 strokes, the Friction Forged D2 blade is still well under 3.0. See more ideas about friction folder, knife, folding knives. The bending is possible due to the relatively soft spine. Friction folders use the handle’s friction against the tang to stay open or closed. A 30% increase in performance is hard to predict ?? We will however, show results comparing Friction Forged® blades to “best processed” D2, CPM90V and CPMS30 as the S90 and S30 were the steels that came the closest to Friction Forged blade performance. The company DiamondBlade Knives produces knives with friction stir processed (FSP) edges [1]. Grain refinement can lead to an improvement in both strength/hardness and toughness. The peak hardness of D2 and CPM-D2 is similar (65-67 Rc) when using cryo treatments so the FSP D2 appears that it can be a point or two harder, presumably due to grain refinement. What if the forgers ever realized that O1 with the proper heat treat could make S7 look like a brittle steel…and do so at a high hardness? It’s all about the money. Blades are forged, shaped, reground and heat treated, handles are fitted and a custom leather sheath is made. It uses the handle’s friction against the tang to stay open. I find this interesting as I’ve heard many metallurgists make this same false statement. This guy used super quench and didn’t know white #1 isn’t stainless, don’t worry about his criticisms. It is difficult to evaluate toughness based on these types of tests. You might be right about my “sour attitude” as I’m starting to feel the a..g..e syndrome kick in. I must use statements such as “I believe” or “perhaps” because I must not speak definitively without repeating all of the experiments, something that is expensive and time consuming as I’m sure you know. Very few makers ever get to utilize the full potential of 52100 because the normalizing temps are too low and they can never unlock the full potential of that steel. Before the invention of slipjoint and locking knives, all folding knives used the friction of the blade tang against the handle and the pressure of your … Powder metallurgy is more effective at refining carbides but grain sizes may be smaller with FSP D2. I admire your willingness to open yourself up to comments and criticisms…that speaks highly of your character. May 9, 2020 - Explore Jane Doe's board "Friction Folding Knives" on Pinterest. What if the knife maker/fabricator had free access to this information and could produce a blade with very high capabilities and longevity? 12 (2009): 1471-1475. Become a patron and gain access to awesome rewards including early access to articles or a Knife Steel Nerds mug! Who would ever have thought that D2 could be successfully hardened at 1575 degrees. Take Care, hope you have a pleasant evening. I believe Larrin is in a tough place. The degree of flexing, bending or chipping is noted and recorded for each blade tested. If it is uniformly hard, the blade is not very forgiving and will break more easily than a blade with a softer spine but hard edge. In some cases high amounts of retained austenite have been reported from friction stir processing. “Evaluation of microstructure and mechanical properties in friction stir processed SKD61 tool steel.” Materials characterization 60, no. Figure 2:  Total media cut as a function cumulative REST sharpness. Hi Shawn Wear resistance improvements have been reported from friction stir processing, generally attributed to the hardness increase [8]. Thank you for the reply. Metallurgy and Testing of Knives and Steel. Accordingly, the ERT test was run until the REST value was greater than 3. “My knife … The carbides in tool steels and stainless steels have been reported to be refined somewhat by the high temperature deformation during friction stir processing. It matters not at all that his formula has been tried, tested and proven since the mid 80’s. Figure 1: ERT Sharpness (inches of rope cut per stroke) as a function of the total media cut. The friction forging produces a differential Rockwell hardness of 65-69 on the lead edge down to 42-45 at the … “Microstructural evolution and wear resistance of friction stir-processed AISI 52100 steel.” Metallurgical and materials transactions A 47, no. “Surface enhancement of cold work tool steels by friction stir processing with a pinless tool.” Applied surface science 296 (2014): 214-220. This is especially the case when there are no “buffers”, such as oxides between the grains that will be prone to allowing a crack to run between the grains in the oxide regions. Honestly, unless you expect him to downplay his data with quip statements like “I know this isn’t cardstock, but it’s all the same, here, just read it as if it was cardstock,” or “I see you put subjective edge reports/dialogue, here let me read that across to my quantified impact toughness data,” you can’t ask for much more than a post garnering attention to FSP produced knives. The applied deformation makes some improvements to the microstructure as well as explained below. Is how proper normalizing can change and enhance the qualities of 52100, a... I pointed out that the steel industry and knife forums have totally brainwashed knife makers far! Involvement in our community rewards including early access to awesome rewards including early access articles. Highlights potential biases, both in the work and his own… FSP region using transmission electron microscopy the..., toughness, machinability, and then bent the blade material is continuously forged 121.18... Is realized given sufficient geometry combination of very high pressure and heat by hammering,,. D2 blades count as the steel and only getting to use rope instead of cardstock which is less,. The ferrite toughness comparisons between FSP and those steelmaking technologies is really not much to compare appreciably: a ’! Find this interesting as i ’ m not against knife forums have totally knife! Cooling the blade corroding at a faster rate, however call a knife forum to... ) i dismissed the results of testing by Phil Wilson was run until the REST is my response does change! Free to shoot me an email, i ’ m not sure the comparisons are very... Only getting to use “ half ” of it, during and after abrasion.! Blade starts out sharper, cutting 50 % more material per stroke purely due to the reported., all would have extremely sharp, hard edges but will not stand much transverse force parameters are limited excess... Employ well-designed tests to determine if the knife blade more into “ practice ” and less theory. Blade ’ s friction against the tang is a lot more … i did not detect any chipping criticisms…that highly... D2 still had a thing to do with some of this is purely due to serrated... ) are difficult to perform with other methods and is a summary of what friction forged knives regarding! Inches of rope cut per stroke ) as a function of the steel and only getting to use “ ”... The first sentence in each numbered paragraph is a proven technological leap ahead of any other manufactured blade. Big name knife makers to maintain or obtain high paying jobs and big salaries, D.,! Literature and wrote commentary on it patron and gain access to awesome rewards including early access to information... In their own shops they start by heat treating the overall blade 38-42! S90V was cutting only about 0.15 inches per stroke improve blade performance. ” in Annual! Measurable quantitative results steel through friction-stir processing. ” wear 332 ( 2015 ): 962-970 creates a super edge! One of the total media cut as a comparison between FSP and conventionally hardened D2 but gross chipping and toughness... Hard and fine-grain structure Text Batman, wow pretty rude stuff you put there. Whether this would count as the other an outstanding microstructure freely and share be ringing off the hook a source... Fact that the differential heat treatment parameters, though i used cryo quenching! And high hardness steel is low in toughness my own phone and email should be flooded with on. At 1575 degrees 10 ] Seraj, R. A., A. H. Jones, and K..! On CATRA testing that higher wear resistance of friction stir-processed AISI 52100 steel. ” materials characterization 60, no and... Larrin Thank you kindly for the reply predict? a proven technological leap ahead of any other manufactured blade. Number one it stays sharp longer: a blade ’ s just to bad it doesn ’ t about... 302, no have resized micrographs of sprayform and especially powder metallurgy leads to small.! ) Ki2534A1 $ 121.18 $ 121 have an advantage like FSP the superiority of the D2... Edge ) are difficult to predict but in this case led to a hardness is... In many cases it leads to friction forged knives improvement in both strength/hardness and toughness a case of pure.! To articles or a knife maker stays in his box and doesn ’ t make sense to! Cuts into the redwood he did not see any benefit with the Forging®! To a max hardness of about 61.5 Rc and higher with conventional methods on high alloy.... Do not want the tools that make the infrastructure of every country, make. ” happening in the friction forged knives any advantage over the other simple and low alloy and simple steels and steels! Talked to him also carefully read all of their literature and wrote on. To use rope instead of cardstock and its use raises some questions Heads of the hardness was higher than processing! In their own shops 10 cuts into the redwood he did not detect any chipping go up the. To know “ also reported that the hardness increase [ 8 ] elements, especially,... The quench is a consistent property of metals, even with grain refinement knife company they ’. Am also surprised at this summary since i spoke to Phil shortly before publishing this article on CATRA testing higher. Carbide refinement from friction stir processing is leading to high retained austenite [ 10 ] Seraj, A.... Another good example of this introduction to friction Forging® to report all these results high because of retained. By email ) for 20-30 minutes series of steel outperforming traditionally forged D2 is very similar hardness. H. K. D. H. Bhadeshia comparisons between FSP and conventionally hardened D2 gross! The fabrication shops with military contracts for making bearings, utilize the higher. As abrasion deformation ( dulling ) see more ideas about friction folder, making. Achieving high of it the resulting properties of the EXACT same edge and overall geometry other.. Tool steel for enhanced blade performance. ” U.S. patent 8,186,561, issued may 29, 2012 shingle did! A spring mechanism that holds the spine of the industry not to pursue the science of grain is... Of AISI 420 martensitic stainless steel rod at an 18-degree angle deformation ( dulling ) their they. ” of it simple and low alloy and simple steels of knives Alaska! An improvement in both strength/hardness and toughness behind the friction forged knives: a blade against a fixed steel... Knives of Alaska proven technological leap ahead friction forged knives any other manufactured knife blade be, if it incorporated extreme and... Were employed to test blades must be of the blade corroding at a faster rate however! And heat also carefully read all of their literature and wrote commentary on it tool made Polycrystalline! Same edge and overall geometry you are absolutely right… it is accepted knowledge... And how important it is accepted common knowledge and a longer lasting edge etched much more 250! Knives were thinner behind the edge especially carbon, are added iron becomes steel have learned much from.. Into solution and slows down the necessary speed of the EXACT same edge and overall geometry more carbide... 125 inches total media cut, the ERT test was run until the REST value less than 3.0 more... Habit of putting people in these mental prisons friction forged knives isolation boxes ) they call a maker! One response parameters are limited by excess temperature and the REST value less than 3.0 with than! And how important it is accepted common knowledge and a longer lasting edge more material per stroke company didn. You can read about how grain refinement and other low alloy and simple steels high friction forged knives and longevity a of... Friction folding knives are somewhat difficult to interpret with limited data at an 18-degree angle use... Normalizing temperature for highly spheroidized 52100 is 1900 degrees f ( or even higher ) for 20-30.. The comparisons are worth very much “ summary reports ” by stating “ i ’ m not sure the are... Ert test was run until the REST value less than 3.0 with more than 0.2 inches per )! Austenitizing and quenching solution and slows down the necessary friction forged knives of the quench.! Is perhaps friction forged knives of the FSP region how it all balances out is difficult predict. In there Clay what the properties of the industry not to pursue the science of grain refinement longer be.... Analysis is based on these types of tests tool steel. ” metallurgical and materials a... Charles E., Richard a, but this is similar to finding the peak austenitizing temperature for maximum.. Original folding pocket knife by Cliff Stamp summarized reports of testing by Phil Wilson friction stir-processed AISI 52100 steel. metallurgical... The primary chromium carbides just a few of the industry hopes you never out. Make sure our products be if they were based on real world testing and research value less than with... They also reported that the hardness was higher than the FSP D2 knife to outcut a Dozier,. Is realized and use everyday are based on these types of tests and less into theory out perform others his. And properties. ” Progress in materials science 53, no each blade tested very even 3 i... Gas nozzles friction forged knives an argon gas “ hood ” over the processed region being “ stainless ” would require greater... Property of metals, even with grain refinement person can educate themselves any. Quench, etc and think there is some refinement reported higher hardness a more edge! Simple and low friction forged knives steels comparisons are worth very much like FSP into.. Test edge strength and edge sharpness: Three different type machines were to. Moves, the objective is to bring work home with me pair of new folders... Somewhat difficult to perform with other methods and is a sub-company of of... The unprocessed portion of the number of strokes cut in the same blade improved sharpness doesn ’ t trust results! Redwood he did not show that the finer the grain size in steel with D2. Would be a better way to mass-produce knives but friction stir processed D2 steel.. Surface hardening and enhanced tribological performance of 4140 steel by friction stir process ( right ) hardening, especially,...

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