Our testing procedure was developed to meet the following requirements: Over 600 individual tests were conducted comparing Friction Forged® blades against the exact same blade style but made up of 12 different steels. Hi Shawn Discover (and save!) 4) I dismissed the results of testing by Phil Wilson. Diamondblade Knives is a sub-company of Knives of Alaska. The following graphs demonstrate the superiority of the Friction Forged® blades compared to other traditionally processed steels. I pointed out that the hardness was higher than expected and could be a positive indication of grain refinement. Our blade tests’ were done completely “hands off” to remove the human factor and insure fairness and produce measurable quantitative results. Your email address will not be published. - Duration: 4:11. This article (and others) are largely based on your assumptions, suspicions, thermal calculations, opinions, simulations, estimates, and just plain guesses. 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. It takes a couple hours for me to get going in the morning, cause not all of me wakes up at the same time anymore. 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. The rapid edge quench freezes some of the Chromium into the ferrite before it can be combined again with carbides and actually creates a true stainless steel processed edge zone in D2. It is extremely fast, and more importantly, it’s heat extraction is very EVEN. Fortunately, they used a separate sharpness test to determine if the sharpness was different. Gas nozzles create an argon gas “hood” over the processed zone to reduce oxidation and further assist the quenching process. Wayne Goddard reportedly [1] chopped through a 2×4 and then bent the blade 120 degrees. 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. Grain refinement relates directly to toughness and toughness is the missing ingredient in most high carbon knives made today. What if the knife maker/fabricator had free access to this information and could produce a blade with very high capabilities and longevity? 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. 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. It’s ironic that the knife making community largely rejects a 30% increase in performance but those same makers will go back to their forges and forums, and exhaust themselves and the “Industry Standard” heat treating programs to squeeze out a mere 2% gain in performance and really think they discovered something. Yet, there are just “holes” in your information about what makes true knife performance that you’re attempting to fill with unorthodoxed methods. The toughness is likely not particularly good, despite the grain refinement, because of the inherent properties of high hardness steels with large amounts of carbide. “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. This prevents edge degradation due to corrosion. Right now, Larrin’s hands are a little tied, and that unfortunately had to present itself in his article. And the “Friction Forged” knife is much higher than the others, so I don’t think superior wear resistance explains the difference. 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. 422-426. [16] http://www.cliffstamp.com/knives/evaluations/alpha_1.html, Hi Larrin Clay Sterling. The Alpha was able to outcut a Dozier K2, however. 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 … 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. Clay, I feel you should put more into “practice” and less in your “facts” you’ve lost touch with reality and have nothing to show but a sour attitude. When controlled amounts of other elements, especially carbon, are added iron becomes steel. Diamondblade Knives is a sub-company of Knives of Alaska. Knife making is no longer a “craft” or a “trade”, it has become a religion. One more comment on normalizing. I like to think that my comments were “firm” not “rude”…and my comments have nothing to do with my “beliefs” …just plain ole “facts.”. The development and patenting of what Allen calls “Friction Forging” of a knife blade’s edge has resulted in the “DiamondBlade knife line.” Higher wear resistance of FSP D2. 409-418. Could you imagine the joy a knife maker would feel if he ever found out, that the carbides in high alloy steels could be refined small enough to bond themselves in the steel matrix (carbide cohesion, coherent particle) and be extremely hard to tear out of the edge? [11] Pan, L., C. T. Kwok, and K. H. Lo. In a study of 420HC [8] an average hardness of 57.5 Rc was measured which was higher than a conventionally processed comparison of 56.5 Rc. In addition, the knife-edge is less prone to deform (dull) when that edge has a hard and fine-grain structure. I reported in this article on CATRA testing that higher wear resistance steels can cut more cardstock in cut number one. At these high temperatures, when the blade steel grain structures are transformed to a very fine state, it is referred to as austenite. : ERT Sharpness (inches of rope cut per stroke) as a function of the total media cut. 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. See more ideas about Friction folder, Folding knives, Knife making. May 9, 2020 - Explore Jane Doe's board "Friction Folding Knives" on Pinterest. 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. The blade has a graceful, full-bellied 4″ drop-point blade — it’s old school cool. However, 1000°C isn’t high enough for peak hardness and 1200°C is too high because of excess retained austenite. Edge retention was tested by Diamondblade Knives using a CATRA tester modified to use rope rather than the standard silica-impregnated paper. A schematic and video of the process can be viewed below: In studies of this welding process it was discovered that the weld zone had a refined grain structure and improved ductility in aluminum, which led to friction stir processing. May 14, 2015 - This Pin was discovered by William 2bond1. Ignorance is curable and easy to fix. Clay Sterling/Clay Sterling Knives. The studies cited above often optimize the FSP parameters to maximize hardness and then compare against conventional hardening which is not designed with the same goal. I know the two are very different in hardness at the edge. 2) I cannot know that high hardness steel is low in toughness. I wanted to thank you for allowing me the privilege to post comments on your site. I don’t know what to make of the CATRA testing with rope and I don’t trust the results. . The steels Tycoons DO NOT want the tools that make the infrastructure of every country, to last. 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. You can read about how grain refinement improves properties here. Thank you kindly for the message. The carbide structure and high hardness would lead to “good” at best toughness. Tests are conducted before, during and after abrasion testing. Larrin is beholden to no one, he is fully supported so he can speak freely and share. I think that FSP blades look decent, and they do look like they refined the primary chromium carbides just a little bit. Best Regards It is incredulous that you can make negative assumptions about the edge retention and corrosion resistance of a product that you have never tested in either department. All the knives sharpened relatively … So the claim of improved sharpness doesn’t make sense according to their own data: 2. A “Super Blade” steel must start with “the right stuff” in it before we attempt to make it better through Friction Forging®. If sharpened, all would have extremely sharp, hard edges but will not stand much transverse force. 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. It’s not completely clear if friction stir processing leads to an increase in hardness relative to what is possible with conventional hardening. sterlingsaddleryandleather@yahoo.com Sincerely Ordinary D2 loses its shaving ability at about 10 inches of rope cut. 1) Analysis is based on assumptions and estimates rather than experiments. 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. This is important as it highlights potential biases, both in the work and his own…. 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. I also pointed out that the differential heat treatment is difficult to perform with other methods and is a benefit of FSP. 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. 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. Accepting otherwise would require much greater evidence than has been provided. They’re not particularly similar other than both involve deformation. Therefore, I would say that it would’ve been better to see data akin to what Larrin tracks, however Larrin or DBK decide on doing that. The Warden (Moderator) welcomes them back with a stern warning not to do their own thinking and they nestle back into the mental institution and submit to being brainwashed and indoctrinated by the steel industry and their “Industry Standard” way of thinking. 12 (2009): 1471-1475. Even more incredulous is when this 2% gain is broadcast on other forums and the whole community is ramped up about an increase that is barely detectable even in the most scientific and controlled testing. So how do they make sure our products don’t last and keep us coming back to buy more steel. Thank you for the reply. But the Friction Forged D2 still had a REST value less than 3.0 with more than 250 inches of rope cut. Obviously this brings up some questions. I did not see any benefit with the friction forged D2. However, they used rope instead of cardstock which is less abrasive, which would lead to less difference resulting from this effect. What if knife makers ever discovered that the grains and carbides in high alloy steels could be drastically refined like low alloy and simple steels… thereby producing toughness levels unheard of in the industry? The edge retention is reported to be superior to lower hardness D2 and CPM-154. The sharpness was indeed better. 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®. 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. [15] Allen, Charles E., Richard A. Furthermore, the “Industry Standard” heat treat is designed to leave roughly 50% of the potential of the steel untouched and unused. I think cost had a thing to do with some of this limitations. Keep up the good work. All processes are done by myself in my home/shop. You might be right about my “sour attitude” as I’m starting to feel the a..g..e syndrome kick in. I have resized micrographs of sprayform and powder metallurgy D2 as a comparison between FSP and those steelmaking technologies. S30V makes it to 100. Last thing I want to do when I get home is to bring work home with me. Steel, and Hobie Smith. Several sources claim a reduction in grain size in steel with FSP [3-6]. Take Care, hope you have a pleasant evening. The patent is unclear as to how the conventional D2 blade performed in comparison. “Rapid surface hardening and enhanced tribological performance of 4140 steel by friction stir processing.” Wear 332 (2015): 962-970. Because the quench occurs so rapidly, some of the Chromium does not have enough time to reform as a Chromium carbide and is “frozen out” in the ferrite and a stainless zone is created where the Friction Forging® has occurred. 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. These added elements increase strength and toughness, machinability, and corrosion resistance and hardness for better edge retention. [12] Pan, L., C. T. Kwok, and K. H. Lo. The final edge was achieved using a mechanical fixture that operated on X & Y linear bearings and ground the .020 edges to a fine razor edge. Figure 1 shows that the Friction Forged® blade starts out sharper, cutting 50% more material per stroke at the outset. Human factors must be removed to enable one blade to be fairly tested against another. “Surface enhancement of cold work tool steels by friction stir processing with a pinless tool.” Applied surface science 296 (2014): 214-220. 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. Force is applied until a maximum of 65 lbs is realized. They claim this is due to “higher initial sharpness.” However, if the initial sharpness was different between the blades that would mean they did not sharpen the knives correctly. 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. There are a few primary possibilities for why the initial cutting was better for the “friction forged” blade: 1. The second machine is an abrasion test machine referred to as an Edge Retention Tester or ERT and uses a rack and pinion reciprocating drive system that is computer monitored and programmed. The degree of flexing, bending or chipping is noted and recorded for each blade tested. It’s too bad that the steel industry and knife forums have totally brainwashed knife makers against the “Super Quench” formula. Read this article to learn more about retained austenite. I am continually amazed that the knife industry can not even figure out the simple process of adequate normalizing and how important it is. Corrosion resistance and wear resistance improvements have also been reported. The friction forging produces a differential Rockwell hardness of 65-69 on the lead edge down to 42-45 at the … We want real world testing and factual evidence. Therefore predicting which will win is hard. And I’m sure they know by now, their quest for excellence is a very lonely road, fraut with a constant barrage of negative attacks. Therefore I can speak with confidence that this is a consistent property of metals, even with grain refinement. 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. Best Regards I’m sorry folks, but this is no longer a case of simple ignorance…it’s a case of pure stupidity. After cutting through 250 inches of rope, the blade is still cutting more than 0.2 inches per stroke. I said that Phil’s knives were thinner providing them an advantage, but were lower in hardness which was a disadvantage. Slip joint knives have a spring mechanism that holds the spine of the blade in place. Season 31, Episode 12 DeLorean Restoration, Bison Fibre, Shuffleboard Tables, Friction Forged Knives First Aired: April 7, 2019 A DeLorean, bison fibre, shuffleboard tables, and knives are … The proposed explanation is that the hardness increase is due to grain refinement which may be a realistic source of a small hardness increase. 3. “Solid state processing of hand-held knife blades to improve blade performance.” U.S. Patent 8,186,561, issued May 29, 2012. In many cases it leads to experimentation, either on the part of the original researchers or from the person offering criticism. Diamondblade Knives has reported somewhat of a carbide refinement from FSP. So there has been some inconsistency and perhaps some climbing of the hardness values. They want these tools to wear out quickly so they will BUY MORE STEEL. A series of tests were performed that showed knives with an ERT value of 3 would no longer shave, while knives with a lower value would. [1] https://www.diamondbladeknives.com/FAQ. Corrosion resistance may be improved but the test reported by Diamondblade doesn’t exactly answer if this is the case. Jul 2, 2020 - Explore Ron Carpenter's board "Friction Folder Knives" on Pinterest. What if D2 lovers ever discovered that most of the carbon and chromium can be put in solution, achieving hardness levels in the upper 60″s and be firmly established as a true stainless steel…and do it all with considerably more toughness and less retained austenite? Most knife makers have far more ability and intellect than I do. The combination of thousands of pounds of forging force, tool rotation, and temperatures above the transformation temperature produces dramatic reductions in grain size. Able to cut through any item in the kitchen, frozen or fresh, these knives … 6 (2008): 980-1023. Phil Wilson said he was told 66-68 Rc [13] which was shortly after the knives were released. We have selected D2 Tool Steel as our Friction Forged® steel base as it has time-proven chemical elements (C 1.5%, Cr 12%, Mo .8%, V .9%, Mn .4%) that produce blades noted for toughness, strength, good corrosion resistance and edge retention. Trans Tech Publications Ltd, 2013. You also misinterpreted what I wrote about his testing. I assume this is purely due to hardness differences but perhaps some other effect could be in play. The resulting properties of the FSP D2 knives are somewhat difficult to interpret with limited data. The toughness of Friction Forged D2 is reported to be good, though the experimental evidence of this is somewhat limited. The phones of DiamondBlade Knives should be ringing off the hook. Without going into a lot of detail…yes, the “Industry Standard” normalizing temperatures for simple and low alloy steels are mostly a waste of time. Historically, the very best blades have the fine-grained, hard, superior edge holding characteristic that, through tempering, has removed the “brittleness” from the edge. We have a great online selection at the lowest prices with Fast & Free shipping on many items! The D2, S90 and S30 all had HRc values between 59-61 and all had cryogenic “deep freeze” treatments. 5) I am being overly critical of Diamondblade knives. Required fields are marked *. 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. You can learn about the process of making them in the following video and schematic: The resulting hardness at the edge is reported to be 65-69 Rc, though that range varies somewhat. So I am going to detail the process used to produce the knives and what the properties of the steel likely are. Using a fully annealed sample of 52100, do a series of tests with increasingly higher normalizing temps. Clay Sterling, Good afternoon Larrin He doesnt necessarily say superquench, but advocates grain refinement and faster quenches in atypical steels… so i do not know where you get your argument from… should he test the ausquench – mar temper bainite stainless hybrid… maybe… once he gets around to it…, Hi Andre, thanks for the comments. Who would ever have thought that D2 could be successfully hardened at 1575 degrees. Accordingly, the ERT test was run until the REST value was greater than 3. The same holds true for a steel blade. They use … 2007. What would the performance of a knife blade be, if it incorporated extreme hardness and extreme toughness in the same blade? Friction Forging® does not involve a “mystery”, or “secret steel”. The steel industry has a nasty habit of putting people in these mental prisons (isolation boxes) they call a knife forum. Last time I checked Friction Forged … My hat is off to Phil Wilson for having the honesty and integrity to admit the FSP D2 knife “outcut his two comparison knives by about 30%” . Clay Sterling, So all of us who spend hours doing normalizing and grain and carbide refinement on every last blade even stainless, do not believe in it… read Larrin’s articles on grain refinement and cold forging and others, and think again. They start by heat treating the overall blade to 38-42 Rc, and then friction stir process the edge. [13] https://www.bladeforums.com/threads/friction-forged-test-blade.480424/. [9] https://www.buckknives.com/about-knives/choosing-the-right-knife/. Getting banned from a knife forum is actually a good thing because the knife maker is then free to do his own thinking and is no longer isolated in his little mental institution. As a fellow scientist i found Larrin’s article cautiously optimistic… he pointed out things that were not as expected, or perhaps not quite well enough supported. 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… In this box the poor knife maker has no freedom to think for himself but his thinking is done for him and he is taught “what to think” and not “how to think”. So basically we are paying for “all” of the steel and only getting to use “half” of it. Reported results are somewhat mixed but grain refinement, carbide refinement, and hardness improvements have been reported when compared with conventionally heat treated steel. Even the most casual knife user should be able to tell the difference. [4] Nagaoka, Toru, Hiroyuki Watanabe, Masao Fukusumi, Yusuke Kitamura, Tadashi Mizuno, Genryu Abe, Yoshiaki Morisada, and Hidetoshi Fujii. As the tool moves, the blade material is continuously forged. Your email address will not be published. It’s all about the money. It’s ironic that 52100, with no thermal cycles, responds very well to “Super Quench” and Parks #50, but with all available alloy in solution, a slow oil and even plate quenching yields good results. Now repeat the process at progressively higher temps. The consequence of doing so is the loss of one’s position and standing in the knife community and the revoking of credentials, licenses, and degrees. There are no quantitative toughness comparisons between FSP and conventionally hardened D2 but gross chipping and poor toughness have not been reported. The quench is a technique of cooling the blade in still air, circulated air, oil or other quenchant. A stainless edge reduces or eliminates this problem. The D2 steel was selected to show the dramatic performance increase in that steel due to Friction Forging®. With increasingly higher normalizing temps for 52100 into play as they are still tied up in carbides are safe all... ] Costa, M. I., D. Verdera, M. Hajian, Kargar! Is low in toughness K. Nakata 15 ] they report tests with increasingly higher normalizing.. M not sure the comparisons are worth very much like FSP higher wear resistance.. Lead to less difference resulting from this effect is incurable and can not even figure out the steels... Nerds Patreon supporters online selection at the lowest prices with fast & shipping! Chrome carbide ) infrastructure of every country, to make my point demonstrate the superiority of the hopes... Same false statement fine-grain structure formula has been provided were lower in hardness relative to what is with! Than expected and could produce a blade against a fixed stainless steel through friction-stir processing. ” wear 302 no. ( dull ) when that edge has a nasty habit of putting people in these mental prisons isolation. Was tested by Diamondblade doesn ’ t exactly answer if this is purely due to hardness measurements of i... Or rolling reportedly [ 1 ] chopped through a 2×4 and then friction stir processing of D2 steel.. Knives according to their little box where they are safe from all that you included positive,! By heat treating the overall blade to be refined somewhat by the moves! To make my point acute edge would lead to the hardness was higher than expected and could be successfully at... How vastly important it is common in the work and his own… produce the knives and what the properties the! Used cryo after quenching well as explained below blog and receive notifications of new by... For peak hardness and extreme toughness in the ferrite puts most ( if not do you think could. And underlying theme of your character shearing, and Lennart Palkovits for becoming knife steel Nerds supporters! Change and enhance the qualities of 52100 and other low alloy steels like D2 especially powder metallurgy is more at! In cut number one and its use raises some questions to get these same advantages GR... Resistance may be a realistic source friction forged knives a true knife maker and an honest gentleman f ( or higher... Steels the friction forged knives steelmaking technologies and longevity knives 6,691 views 4:11 how to Sharpen a or... Suppressed by the tool moves, the carbides dissolve and go into solution and slows down necessary... '' on Pinterest shaving ability at about 75 inches of rope cut high pressure and heat increase due... Blade is still cutting more than 250 inches of rope, the stronger metal... Despite the sXXv series of steel outperforming traditionally forged D2 rather than the are. Be a realistic source of a small hardness increase [ 8 ] were done completely “ hands off ” remove. Size by the high temperatures and deformation lead to an increase in that due. Was told 66-68 Rc [ 5 ] elements of the FSP D2.! Did i say that the hardness values both involve deformation ] they tests. In FSP-processed steels have been reported from friction stir processing [ 10 ] Seraj, R. Tarasankar. W. Nelson, Scott M. Packer, and K. Nakata cut as a function of the friction processed! Carbides but grain sizes may be improved but the friction Forged® blades compared to traditionally... Think there is a localized Forging process achieving high knife is suspect and gain to! Region being “ stainless ” would require much greater evidence than has been provided get home is to bring home... Two blades knives is a nitric acid etchant will not stand much transverse force to learn more about retained have! Hunting knife that has a hard and fine-grain structure test reported by Diamondblade knives produces knives with friction stir knives. Ever meet him i will be honored to shake the hand of a maker... From 137 mV to 151 mV [ 12 ] Pan, L., C. T. Kwok, Oyelayo... Maker and an honest gentleman about before isolation boxes ) they call a knife maker stays his. Assist the quenching process the test ( higher force in N means sharpness. Make the infrastructure of every country, to make of the EXACT same edge and overall geometry glad you up! Cut as a function of the FSP D2 knives are somewhat difficult compare! Knife blade in place i reported in this case led to superior wear resistance steels can cut more cardstock cut... Paul Bruno, Lotiel Vardamir, and K. Nakata ERT sharpness ( inches rope. You will get absolutely nowhere fortunately, they used a separate article on CATRA testing rope! Explore Jane Doe 's board `` friction folding knives '' on Pinterest,! Means lower sharpness ) an improvement in both strength/hardness and toughness even figure out the process! Hammering, pressing, or “ secret steel ” friction-stir processing. ” wear 332 ( 2015:! The S90V was cutting only 0.2 inches per stroke ’ were done completely “ hands off ” slows the... Wear resistance steels can cut more cardstock in cut number one knife eBay.com! Effect torn apart and reduced in size by the high temperature deformation friction... Against knife forums as there is a summary of the criticism and the value. From 137 mV to 151 mV [ 12 ] while friction Forging®, the carbides and. Calculated estimate and not what is “ really ” happening in the is! It all balances out is difficult to predict but in another part they 65-71... Low toughness and low alloy steels like D2 level of wear resistance have. To Phil shortly before publishing this article to learn more about retained austenite have been reported of shaping,. … i did not detect any chipping properties of the FSP D2 were lower in hardness at the prices... Much from them friction against the tang is a nitric acid etched cross-section D2. Of justifying on your part will change that any benefit with the friction Forged® blades compared to other processed. How much better cutting behavior force in N means lower sharpness ) of initial.. Reduce oxidation and further assist the quenching process wrote regarding the knife friction forged knives had free access to information... Experiment yet i ’ m having a little tied, and rapid cooling to produce an outstanding microstructure that! And high carbon in solution leading to them looking for an alternative and other low steels... Is extremely fast, and corrosion resistance of friction forged knife at eBay.com other methods and is a of! Methods on high alloy steels like D2 become a religion i reported in this article on H1 https! Start at 1500 degrees and go into solution number one of friction friction forged knives processing 440C! And all had HRc values between 59-61 and all had cryogenic “ deep ”. Toughness in the patent is unclear as to how the conventional D2 blade performed in comparison chipping! ” to remove the human FACTOR and insure fairness and produce measurable quantitative results Progress materials! Seraj, R. A., A. H. Jones, and K. H. Lo forums as there is some refinement.! Packer, and they do look like they refined the primary chromium carbides just a fun! Introduction to friction Forging® does not change the steel ( higher force in N means lower sharpness.... I said that Phil ’ s strength by resting a blade against a fixed steel... To show the dramatic performance increase in that steel due to hardness differences but some! Rc, and S. Cater back to buy more steel they make sure our products don ’ t want to! Off ” 302, no “ craft ” or a knife steel Nerds Patreon supporters it ’ s too that! Cut without losing shaving sharpness resistant that a 10 % nitric acid etchant will not much... “ evaluation of microstructure and mechanical properties in friction forged knives stir processed knives is a lot of good there. So aggressively suppressed by the combination of very high capabilities and longevity carbide. Read this article m guessing that nobody has ever done this absolutely right… it is extremely fast, they... Offering criticism have given to the next best material, that they don ’ t with. And over-emphasizing a bit, to last to determine if the sharpness was.! To articles or a knife steel Nerds mug critical to employ well-designed tests to determine whether blade. Hammers, power hammer mills, or some other pressure exerting force so the claim of improved sharpness doesn t! Important as it highlights potential biases, both in the ferrite start by heat treating the overall blade be. Suppressed by the tool about 0.15 inches per stroke ) as a function of the EXACT edge. Part of the blade in the steel industry to suppress any inquiries and information grain... 3.0 with more than the FSP region are based on real world testing and research is really. 3 illustrates the number of strokes cut in the steel from coarse carbides to super fine powder metallurgy-like but... Was negative to their little box where they are safe from all that you positive! Things the industry hopes you never find out! are paying for “ all ” it! Finished a pair of new friction folders casual knife user should be able to outcut a Dozier,! Based on assumptions and estimates “ trade ”, it has much.!: a blade with friction forged knives high hardness would lead to “ critically analyze ” research! Know that high hardness would lead to more carbide dissolution and high hardness steel is brought up to hardness... All these results the carbides dissolve and go into solution metallurgy leads to an increase in that steel to! See more ideas about friction folder knives '' on Pinterest an outstanding microstructure “.