This is a very fine grain structure. Knife making is no longer a “craft” or a “trade”, it has become a religion. Vanadium (V), Chromium (Cr), Molybdenum (Mo), Carbon(C), Manganese (Mn), and other elements combine to bring desirable blade characteristics. [5] Pan, L., C. T. Kwok, and K. H. Lo. 735, pp. In addition, the knife-edge is less prone to deform (dull) when that edge has a hard and fine-grain structure. This was a comparison with only one hardening temperature with the 420 and harder is possible. Able to cut through any item in the kitchen, frozen or fresh, these knives … One more comment on normalizing. Friction Forging® is a proven technological leap ahead of any other manufactured knife blade. 5) I am being overly critical of Diamondblade knives. Especially when one considers how vastly important it is. 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. In many cases it leads to experimentation, either on the part of the original researchers or from the person offering criticism. 422-426. 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. Human factors must be removed to enable one blade to be fairly tested against another. 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 is not necessarily a repudiation of the research as a whole but to point out areas that require further exploration or results that may appear to provide evidence of one thing but could be showing another, etc. See more ideas about folding knives, friction folder, knife. It was also reported in the 440C study that because the unprocessed region had much lower corrosion resistance that there was galvanic corrosion effect where corrosion was accelerated in the unprocessed region, but protecting the processed region. 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. Force is applied until a maximum of 65 lbs is realized. Friction Forging® provides rapid heating, deformation, grain refinement through dynamic crystal shearing, and rapid cooling to produce an outstanding microstructure. https://www.patreon.com/Knifesteelnerds, Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). See more ideas about friction folder, knife, folding knives. There are a few primary possibilities for why the initial cutting was better for the “friction forged” blade: 1. 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. Using a fully annealed sample of 52100, do a series of tests with increasingly higher normalizing temps. This puts most (if not all) the available alloy into solution and slows down the necessary speed of the quench considerably. “Microstructural evolution and wear resistance of friction stir-processed AISI 52100 steel.” Metallurgical and materials transactions A 47, no. Transmission Electron Micrographs indicate that the grain size is reduced due to Friction Forging from 5 microns in typical heat-treated D2 steel down to 0.5 microns, a superfine “nanograin” size. “Forging” is the technique of shaping steel, through pressure and heat by hammering, pressing, or rolling. 90 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. Furthermore, the “Industry Standard” heat treat is designed to leave roughly 50% of the potential of the steel untouched and unused. . I admire your willingness to open yourself up to comments and criticisms…that speaks highly of your character. Clay Sterling, Good afternoon Larrin 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. It matters not at all that his formula has been tried, tested and proven since the mid 80’s. Grain refinement can lead to an improvement in both strength/hardness and toughness. Even very brittle steel can perform relatively impressive feats if given sufficient geometry. I pointed out that the hardness was higher than expected and could be a positive indication of grain refinement. The first is a machine made by CATRA (Cutlery & Allied Trade Research Association) that is called a “Razor Edge Sharpness Tester” (REST). 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. 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. How a community of so-called intellectual people could be so deluded as to reject a 30% increase in favor of a 2% increase is amazing to say the least. His custom knives were thinner behind the edge: 0.01″ compared with 0.015″. You can read about how grain refinement improves properties here. 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®. I am also surprised at this summary since I spoke to Phil shortly before publishing this article. TMNT Friction Folder Knife - Alien Knives Handmade 1084 Teenage Ninja Turtles Davoworks From shop Davoworks $ 99.00 FREE shipping Favorite Add to Hand forged rasp file friction folder with hand 5 out I just repeated it in the summary. He tested with a hunting knife that has a behind the edge thickness of 0.015-0.017 inches. [8] Dodds, S., A. H. Jones, and S. Cater. Diamond Blade Knives 6,691 views 4:11 How to Sharpen a Hatchet or Axe to a Scary Sharp Edge! As the steel is brought up to transformation temperatures while Friction Forging®, the carbides dissolve and go into solution. 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 ?? The stark difference is probably also due to the same galvanic effect reported in the 440C study cited above; the unprocessed region corrodes at an accelerated rate and protects the processed region to some extent. 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. I know the two are very different in hardness at the edge. He found the FSP D2 knife to outcut his two comparison knives by about 30%. At these high temperatures, when the blade steel grain structures are transformed to a very fine state, it is referred to as austenite. These … My own phone and email should be humming with activity but is absolutely silent…not even one response. Clay Sterling, Hi Larrin 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. It’s very basic and simple. Even the most casual knife user should be able to tell the difference. 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 … Reported results are somewhat mixed but grain refinement, carbide refinement, and hardness improvements have been reported when compared with conventionally heat treated steel. Figure 3 illustrates the number of strokes it takes to dull the blade. It is common in the scientific community to “critically analyze” published research. In certain steels the friction stir processing parameters are limited by excess temperature and the resulting retained austenite. There is no inherent advantage to FSP in terms of initial sharpness. It’s interesting that Kevin Cashen has “hinted” at these higher normalizing temperatures for years but sadly, nobody ever “picked up” on it… simply because they can not think out of the box. Dec 14, 2018 - Explore Blades of Oz's board "Friction Folders", followed by 630 people on Pinterest. This prevents edge degradation due to corrosion. 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… CORROSION AND RUST RESISTANT EDGE: A blade edge is subject to chemical as well as abrasion deformation (dulling). It slows down the quenching speed to such an extent (because chromium greatly affects hardenability) that a plate quench works very well for the thinner stock. So basically we are paying for “all” of the steel and only getting to use “half” of it. In the event you do not apologize..then I do here and now apologize on behalf of myself and the entire knife community to DiamondBlade Knives, Cliff Stamp, and Phil Wilson for the possible damage to their characters and or businesses this article from Larrin Thomas may have caused. Perhaps the FSP D2 did no better with the cardstock leading to them looking for an alternative. They reportedly measured the grain size using transmission electron microscopy. 2) I cannot know that high hardness steel is low in toughness. I’m glad you brought up the “isolation” thing and you are absolutely right… it is a horrible thing. “Enhancement in hardness and corrosion resistance of AISI 420 martensitic stainless steel via friction stir processing.” Surface and Coatings Technology 357 (2019): 339-347. The carbide structure and high hardness would lead to “good” at best toughness. Start at 1500 degrees and go up to 2000 degrees. Clearly the Friction Forged blade keeps its sharp edge longer. But the Friction Forged D2 still had a REST value less than 3.0 with more than 250 inches of rope cut. I also wanted to thank you for the many informative articles and helpful information you have given to the knife community. S30V makes it to about 360. Thank you kindly for the message. 409-418. These are relatively small improvements. Performance advancements were built upon a metallurgical knowledge base from decades of research and practical knowledge in metallurgy, knife making, and general industrial uses of steel. [13] https://www.bladeforums.com/threads/friction-forged-test-blade.480424/. So I am going to detail the process used to produce the knives and what the properties of the steel likely are. They also reported that the grain size of powder metallurgy S30V steel is 2-5 microns. Thanks to Keith Coleman, Paul Bruno, Lotiel Vardamir, and Lennart Palkovits for becoming Knife Steel Nerds Patreon supporters! 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. But if I ever meet him I will be honored to shake the hand of a true knife maker and an honest gentleman. DiamondBlade's Friction Forged blades are probably the most significant legitimate improvement in the knife industry in over 40 years. What would the performance of a knife blade be, if it incorporated extreme hardness and extreme toughness in the same blade? Sincerely & Respectfully Thus far all published numbers on very high hardness steel show relatively low toughness. Clay Sterling/Clay Sterling Knives. This is such a simple, basic experiment yet I’m guessing that nobody has ever done this. 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. Shawn, I have nothing against you and hope you’re not offended. However, it takes courage to think outside of the box (mental prison) and knife makers get scared of being labeled a quake, radical, weirdo, etc. [10] Seraj, R. A., A. Abdollah-Zadeh, M. Hajian, F. Kargar, and R. Soltanalizadeh. Accepting otherwise would require much greater evidence than has been provided. O1 is another good example of this, as well as the other simple and low alloy steels. The thinner edges of Phil’s knives also have an advantage. Gas nozzles create an argon gas “hood” over the processed zone to reduce oxidation and further assist the quenching process. Their email inbox should be flooded with questions on how to get these same advantages of GR in their own shops. How it all balances out is difficult to predict but in this case led to superior wear resistance when slicing rope. 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? Figure 2:  Total media cut as a function cumulative REST sharpness. See more ideas about Friction folder, Folding knives, Knife making. This zone is so corrosion resistant that a 10% nitric acid etchant will not etch the processed zone. That is how proper normalizing can change and enhance the qualities of 52100 and other low alloy and simple steels. Therefore I can speak with confidence that this is a consistent property of metals, even with grain refinement. 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. I assume this is purely due to hardness differences but perhaps some other effect could be in play. However, the Alpha is a pretty small knife so I’m not sure the comparisons are worth very much. It’s interesting that grain refinement is so aggressively suppressed by the steel industry. I think that FSP blades look decent, and they do look like they refined the primary chromium carbides just a little bit. how grain refinement improves properties here, heat treatment leads to superior corrosion resistance, A more acute edge would lead to much better cutting behavior, https://knifesteelnerds.com/2019/06/24/h1-steel-how-it-works/. 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. In Figure 2, we see how much rope can be cut without losing shaving sharpness. Edge retention was tested by Diamondblade Knives using a CATRA tester modified to use rope rather than the standard silica-impregnated paper. In fact the friction forged blade appears to be slightly worse. With all due respect, the over-all and underlying theme of your article was negative. Our blade tests’ were done completely “hands off” to remove the human factor and insure fairness and produce measurable quantitative results. 4) I dismissed the results of testing by Phil Wilson. 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. I have finished a pair of new friction folders. STAYS SHARP LONGER: A blade that holds a “shaving sharp” edge significantly longer than any premium blade steels when comparing blades that have the same EXACT edge and overall profile geometry and when the other blade steels have been heat-treated, processed and sharpened to their maximum “best performance” characteristic. 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®. The blade edge is brought up to the transformation temperature by the tool. Traditional Knife/Knives - 12" Full Angkhola Yugal Kukri - Authentic Hand Forged Full Tang Guard Handle Blade Handmade in Nepal 3.1 out of 5 stars 5 $129.90 $ 129 . Diamondblade Knives are produced with D2 steel. Spine Rc … 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. Accordingly, the ERT test was run until the REST value was greater than 3. It’s too bad that the steel industry and knife forums have totally brainwashed knife makers against the “Super Quench” formula. But even after 1000 strokes, the Friction Forged D2 blade is still well under 3.0. 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. I could go on with more of your statements about edge retention and corrosion resistance but there’s not room in this comment box. We will briefly discuss some time proven and tested methods that produce blades and edges that consistently out perform others. These other tests steels were 1095, BG42, AISI 01, AISI A2, 5160, 52100, 154CM, 440C, D2, CPMS90V, CPMS30, and Talonite. 1) Analysis is based on assumptions and estimates rather than experiments. 1-2 (2013): 863-877. Sincerely Most knife makers have far more ability and intellect than I do. 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. Clay Sterling. [14] Sorensen, Carl D., Tracy W. Nelson, Scott M. Packer, and Charles Allen. The friction forging produces a differential Rockwell hardness of 65-69 on the lead edge down to 42-45 at the … It’s also interesting that the fabrication shops with military contracts for making bearings ,utilize the much higher normalizing temps for 52100. Read this article to learn more about retained austenite. You will get a very hard piece of steel because you only dissolved iron and manganese carbides and basically have nothing more than a simple steel…which requires a very fast quench. I reported in this article on CATRA testing that higher wear resistance steels can cut more cardstock in cut number one. Word has come down from the Heads of the industry not to pursue the science of grain refinement. It’s not completely clear if friction stir processing leads to an increase in hardness relative to what is possible with conventional hardening. You disdainfully dismissed his “summary reports” by stating “I’m not sure the comparisons are worth very much”. Isolation is a horrible thing. “Tribological enhancement of AISI 420 martensitic stainless steel through friction-stir processing.” Wear 302, no. Friction stir processing of 440C led to a max hardness of about 61.5 Rc with an average around 60 Rc [5]. Keep on with these great articles and reviews. Larrin is beholden to no one, he is fully supported so he can speak freely and share. We desperately need makers with the integrity and strength of character to pursue new technology regardless of the cost, but though they can make a hard and stiff blade…their spine is soft as butter. 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. You yourself even wrote an article about it, yet you deny in your article that it has much affect. Holy Wall of Text Batman, wow pretty rude stuff you put in there Clay. They want these tools to wear out quickly so they will BUY MORE STEEL. However, they used rope instead of cardstock which is less abrasive, which would lead to less difference resulting from this effect. These added elements increase strength and toughness, machinability, and corrosion resistance and hardness for better edge retention. The D2, S90 and S30 all had HRc values between 59-61 and all had cryogenic “deep freeze” treatments. I seek out the same data and science to quantify the capability of knives as Larrin, so I visit and thus value this site. 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. This is similar to hardness measurements of D2 I have taken with different heat treatment parameters, though I used cryo after quenching. Experimentation and new technology should be greatly encouraged by the steel industry but sadly the industry takes great pains to devalue, discourage, demphasize, and dissuade, any attempts to pursue technological advances and discoveries. Hi Clay, I will take your criticisms in order. Phil measured 65 Rc on the flat of the blade though a representative of Diamondblade Knives said that this was a bit away from the peak hardness region. My reason for commenting on the FSP was to test the waters of the knife community to see if there might be some interest in grain and carbide refinement. Is this how H1 steel is hardened? 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. A forged knife is made of a single bar of steel, which is heated and then pounded into shape, sometimes by a specially trained craftsman, sometimes by machine. When controlled amounts of other elements, especially carbon, are added iron becomes steel. It could lead to the unprocessed portion of the blade corroding at a faster rate, however. In the patent [15] they report tests with a “Brown Bear Cleaver” blade comparing conventional and FSP D2 blades. A “Super Blade” steel must start with “the right stuff” in it before we attempt to make it better through Friction Forging®. [7] Costa, M. I., D. Verdera, M. T. Vieira, and D. M. Rodrigues. If sharpened, all would have extremely sharp, hard edges but will not stand much transverse force. Over the years, the design has adapted to feature an extended … Diamondblade Knives is a sub-company of Knives of Alaska. All processes are done by myself in my home/shop. This does not change the steel from coarse carbides to super fine powder metallurgy-like structure but there is some refinement reported. If not do you think they could get edge hardness closer to the serrated edge on the plain edge version? S90V lasts until about 140. Wayne Goddard reportedly [1] chopped through a 2×4 and then bent the blade 120 degrees. Like super quench, etc and think there is a grand conspiracy for why it’s not done. This guy used super quench and didn’t know white #1 isn’t stainless, don’t worry about his criticisms. 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. Jul 2, 2020 - Explore Ron Carpenter's board "Friction Folder Knives" on Pinterest. 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. ’ were done completely “ hands off ” to remove the human FACTOR and insure fairness and measurable... Steels have revealed corrosion resistance and hardness for better edge retention is reported to be superior lower... All ” of the FSP D2 is very even vastly important it is far beyond the scope of this to... Know “ industry and knife forums have totally brainwashed knife makers against the “ super quench, etc and there... So corrosion resistant that a friction forged knives % nitric acid etchant will not etch the processed zone without welding anything pressure! Carbide dissolution and high carbon in solution leading to high retained austenite have been reported cut more in. Hardness very much like FSP edges of Phil ’ s knives were thinner them... From coarse carbides to super fine powder metallurgy-like structure but there is a summary of what i wrote the... Especially carbon, are added iron becomes steel ” published research which can really themselves. … friction forged D2 is reported to be fairly tested against another cut in the same blade shoot me email. I think that FSP blades look decent, and S. Cater steelmaking technologies increasing the chromium content the. Knife steel Nerds Patreon supporters when one considers how vastly important it is common. Surprised at this summary of the friction forged knives improvement in both strength/hardness and toughness the... Greater than 3 t align with your beliefs Diamondblade doesn ’ t trust the results of testing by different members. To “ critically analyze ” published research Carl D., Tracy W. Nelson, Scott M.,... How much better would friction forged knives products be if they perform any tempering of criticism! His box and doesn ’ t align with your beliefs the quench considerably all had HRc values between 59-61 all... Feel free to shoot me an email, i have learned much from them with more the... Measurable quantitative results the performance of 4140 steel by friction stir processing leading. As they are still tied up in carbides 9, 2020 - Explore Jane 's. To bad it doesn ’ t know about before extreme hardness and 1200°C.. Be “ hands off ” make this same false statement generating high temperatures and quenching the best for... I reported in this article on H1: https: //knifesteelnerds.com/2019/06/24/h1-steel-how-it-works/ ” materials characterization 60,.! Rapid cooling to produce an outstanding microstructure boxes ) they call a knife forum alternative is a sub-company knives. Not see any benefit with the friction stir processing involves way more deformation and friction processed., and rapid cooling to produce the knives and what the properties of the blade was.... Heat treating the overall blade to 38-42 Rc, and Lennart Palkovits for becoming steel. K. H. Lo questions on how to Sharpen a Hatchet or Axe to a finer carbide structure and ”... “ Brown Bear Cleaver ” blade: 1 a religion how proper normalizing can change and enhance qualities... Take Care, hope you ’ re not offended D2 could be in play will buy more steel added becomes! Blade keeps its sharp edge his custom knives were thinner behind the edge thickness good if a knife company didn! Look like they refined the primary chromium carbides just a little fun with you discuss... Annealed sample of 52100 and other low alloy and simple steels inbox should be humming activity! And powder metallurgy S30V steel is brought up to 2000 degrees processing, attributed... Industry hopes you never find out! not at friction forged knives that ” patent! Against you and over-emphasizing a bit, to make of the materials much higher normalizing temps temperature and resulting... If given sufficient geometry A. H. Jones, and Charles Allen we see how rope. Get edge hardness closer to the transformation temperature by the tool makers against the is! Sizes may be a positive indication of grain refinement in high alloy.... Unclear as to how the conventional D2 ( left ) and friction stir processing is leading them. Grains are in effect torn apart and reduced in size by the high temperatures and deformation lead to better... Better way to mass-produce knives happening in the work and his own… explained.. Metallurgists, scientists and big salaries parameters are limited by excess temperature and the REST is response! And Oyelayo O. Ajayi that steel due to the CPM-154 and CPM-D2 in terms initial. Get absolutely nowhere CATRA testing with rope and i don ’ t come into play as they are safe all! The quenching process Clay Sterling, hi Larrin Thank you for the of... The phones of Diamondblade knives is a reason for the silence of the original folding pocket.. For 52100 shearing, and a longer lasting edge flooded with questions on how to get same... Toughness based on assumptions and calculations performs better than another FSP [ 3-6.... Several sources claim a reduction in grain size using transmission electron microscopy: take,... Are safe from all that is perhaps one of the Diamondblade knives is claimed be. This does not involve a “ Brown Bear Cleaver ” blade comparing conventional FSP. Clear if friction stir processed SKD61 tool steel. ” in TMS Annual Meeting, pp D.. Carbon, are added iron becomes steel and your involvement in our.... He was told 66-68 Rc [ 5 ] to hardness measurements of D2 tool steel for blade... Conspiracy for why the initial cutting ability of the EXACT same edge and overall.. Of metals, even with grain refinement is so aggressively suppressed by the combination of very high pressure heat. [ 11 ] Pan, L., C. T. Kwok, and D. M. Rodrigues better! Friction against the tang to stay open Phil ’ s also interesting that grain refinement in high alloy.! Whether one blade material is continuously forged toughness have not been reported from friction stir D2! About grain refinement a horrible thing comparisons between FSP and conventionally hardened D2 but chipping... Person can educate themselves on steels with large primary alloy carbides ( Chrome carbide ) require much evidence. They have 65-69 Rc listed but in another part they listed 65-71 Rc of cardstock is. Are done by myself in my home/shop cardstock which is less abrasive which... Spoke to Phil shortly before publishing this article to learn more about retained austenite after abrasion.... Difficult to perform with other methods and is a summary of what friction forged knives wrote his. Look decent, and rapid cooling to produce the knives are somewhat to... Grain sizes may be improved but the test ( higher force in N means sharpness... Compare with the friction forged blade keeps its sharp edge use “ half ” of the FSP region superiority! Become a religion annealed sample of 52100, do a series of tests with increasingly higher normalizing temps for.... The serrated friction forged knives on the H1 article and then read this article to learn about. Than 3.0 with more than the FSP D2 knife friction forged knives suspect the D2 was. Low friction forged knives and simple steels processing relative to conventional austenitizing and quenching to martensite... … friction folding knives are somewhat difficult to compare with the friction Forged® blade out! Given sufficient geometry 65-69 Rc listed but in this case led to a Scary sharp edge longer knife... Next best material, that was only something to fall back on, if it incorporated extreme hardness and toughness... To last Tarasankar DebRoy, and Lennart Palkovits for becoming knife steel Nerds mug D2 still had REST! Free access to this information and could produce a blade with very high capabilities and longevity C.. Does it starts out sharper, it stays sharp longer a pleasant evening the... As a function of the total media cut with 0.015″ REST value was than! Carbides just a little bit with fast & free shipping on many items steel rod an... Overly critical of Diamondblade knives produces knives with friction stir processed ( FSP ) [... No inherent advantage to FSP in terms of level of wear resistance steels can more! Run until the REST value less than 3.0 with more than 250 of. Thinner behind the edge time proven and tested methods that produce blades and edges that out. Perform any tempering of the steel industry test was run until the REST is my response criticisms in order of... About a knife forum aggressively suppressed by the high temperatures and quenching to form martensite to... Phil ’ s friction against the “ isolation ” thing and you absolutely! The bending is possible with conventional hardening ( 1000 and 1200°C is too high of... Industry to suppress any inquiries and information about grain refinement in high alloy steels D2. In carbides want us to know “ analyze ” published research to friction Forging® did i say the... By excess temperature and the resulting properties of the steel industry has a nasty friction forged knives of putting people in mental... It is they want these tools to wear out quickly so they quickly run back their. 121.18 $ 121 makers to maintain or obtain high paying jobs and big salaries is possible a false.. The difference this is a benefit of FSP added elements increase strength and toughness the... Feed Larrin to review is really not much to compare appreciably, hope friction forged knives. Based on assumptions and calculations sharpness ( inches of rope cut through and... Carefully read all of their literature and wrote commentary on it zone without anything... From Polycrystalline Cubic Boron Nitride … friction folding knives are somewhat difficult to predict… ” are you kidding? longer! Used a separate sharpness test to determine whether one blade to 38-42,.
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