. 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. I have finished a pair of new friction folders. Thanks for this site and your involvement in our community. However, the database used for that equation did not have many knives of high hardness so it could be that experimentally the value is somewhat different. Become a patron and gain access to awesome rewards including early access to articles or a Knife Steel Nerds mug! Anyone who reads the article may learn about a knife company they didn’t know about before. With all due respect, the over-all and underlying theme of your article was negative. Required fields are marked *. Take Care, hope you have a pleasant evening. The patent is unclear as to how the conventional D2 blade performed in comparison. Friction Forging® does not involve a “mystery”, or “secret steel”. In some cases it looks like hardness may reach 1-2 Rc higher than conventional processing. In fact the friction forged blade appears to be slightly worse. Yet you flippantly dismissed his expertise by stating “How it all balances out is difficult to predict…” Are you kidding ?? Over the years, the design has adapted to feature an extended … [6] Chen, Y. C., and K. Nakata. 12 (2009): 1471-1475. Ignorance is curable and easy to fix. 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. What is forging? Number of … I assume this is purely due to hardness differences but perhaps some other effect could be in play. When controlled amounts of other elements, especially carbon, are added iron becomes steel. 90 Good evening Nope Hi Clay, I will take your criticisms in order. Perhaps the FSP D2 did no better with the cardstock leading to them looking for an alternative. However, we already know that heat treatment leads to superior corrosion resistance so we would expect the un-processed region to etch more in the acid. [13] https://www.bladeforums.com/threads/friction-forged-test-blade.480424/. 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. Thanks to Keith Coleman, Paul Bruno, Lotiel Vardamir, and Lennart Palkovits for becoming Knife Steel Nerds Patreon supporters! so they quickly run back to their little box where they are safe from all that. They start by heat treating the overall blade to 38-42 Rc, and then friction stir process the edge. “Enhancement in hardness and corrosion resistance of AISI 420 martensitic stainless steel via friction stir processing.” Surface and Coatings Technology 357 (2019): 339-347. 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. It’s all about money. When cooled slowly the grain structures will change to a softer, larger grain sized mixture termed pearlite and cementite, and the steel will be softer. Diamond Blade Knives 6,691 views 4:11 How to Sharpen a Hatchet or Axe to a Scary Sharp Edge! Stupidity is a religious induced stupor, brought about by a misguided allegiance to a false ideal. Your email address will not be published. [5] Pan, L., C. T. Kwok, and K. H. Lo. Metallurgy and Testing of Knives and Steel. This is perhaps one of the more interesting elements of the friction stir processed knives is that a differential heat treatment is possible. Diamondblade Knives has reported somewhat of a carbide refinement from FSP. Word has come down from the Heads of the industry not to pursue the science of grain refinement. May 9, 2020 - Explore Jane Doe's board "Friction Folding Knives" on Pinterest. 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. I don’t know if they perform any tempering of the steel afterward. How much better would our products be if they were based on real world testing and research. Diamondblade Knives are produced with D2 steel. This article (and others) are largely based on your assumptions, suspicions, thermal calculations, opinions, simulations, estimates, and just plain guesses. 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. These are relatively small improvements. Differential heat treatments (soft spine, hard edge) are difficult to achieve with conventional methods on high alloy steels like D2. What would happen if knife makers ever found out that the “Industry Standard” heat treat is actually a “Sub Standard” heat treat that only uses half of what the steel has to offer? 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. 4) I dismissed the results of testing by Phil Wilson. 422-426. I am also surprised at this summary since I spoke to Phil shortly before publishing this article. We have a great online selection at the lowest prices with Fast & Free shipping on many items! “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. “Friction” Forging® is a localized forging process achieving high. Many blade “performance tests” such as cutting a free-hanging rope, cutting plastic bottles filled with water, ping-pong balls, to chopping through a 2x4 board are not just the test of a blade—they are also tests of the tester’s personal ability. Keep on with these great articles and reviews. I just repeated it in the summary. This prevents edge degradation due to corrosion. Thank you kindly for the message. Phil Wilson compared the edge retention of a CPM-154 and CPM-D2 knife both at 62 Rc that he made to a FSP D2 knife [13]. Phil Wilson said he was told 66-68 Rc [13] which was shortly after the knives were released. 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. Have you ever personally visited with DiamondBlade Knives about your doubts and concerns instead of subtly devaluing their product (without factual evidence) in the eyes of all your readers ?? The bending is possible due to the relatively soft spine. 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. 10 $54.99 $54.99 It’s simple…they give us an “Industry Standard” heat treating program that largely ignores grain refinement (toughness) and focuses more on hardness (strength). S30V makes it to about 360. Even very brittle steel can perform relatively impressive feats if given sufficient geometry. 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®. 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. (: Sharpness was nearly equal between the four knives according to the test (higher force in N means lower sharpness). I have resized micrographs of sprayform and powder metallurgy D2 as a comparison between FSP and those steelmaking technologies. I can see now that the community is scientifically suppressed to the point where their is little to no interest about GR…even when one of the most respected and reputable knife makers in the business, conservatively reports a 30% increase in performance. Most knife makers have far more ability and intellect than I do. 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. 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. Hand Forged Knives Minnesota MadeWelcome to NorthStar Forge Minnesota’s premier knife makers for custom made knives, swords, metal jewelry, knife accessories, and more. If sharpened, all would have extremely sharp, hard edges but will not stand much transverse force. Ordinary D2 loses its shaving ability at about 10 inches of rope cut. This process looks promising, I really would like to see some more testing and samples of the knives for more people to try out. All test blades were ground on an American Siepmann VG3 grinder to a .020 edge thickness. However, the Alpha is a pretty small knife so I’m not sure the comparisons are worth very much. 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 . You ought to try it some time…who knows, you might even find out it’s a better product than Parks #50 ?? Wayne Goddard reportedly [1] chopped through a 2×4 and then bent the blade 120 degrees. 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. 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. The experimental evidence is a nitric acid etched cross-section of D2 showing that the un-processed region etched much more than the FSP region. Below I have a summary of a few of the studies that claimed grain refinement in tool steel or stainless steels: In general it looks like friction stir processing can lead to grain sizes in the low single digits. S30V makes it to 100. 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. But the Friction Forged D2 still had a REST value less than 3.0 with more than 250 inches of rope cut. The conclusion that the knife was very small and therefore difficult to compare with the others was provided by those doing the testing. They use conventional … I seek out the same data and science to quantify the capability of knives as Larrin, so I visit and thus value this site. “Forging” is the technique of shaping steel, through pressure and heat by hammering, pressing, or rolling. WOW !!! “Solid state processing of hand-held knife blades to improve blade performance.” U.S. Patent 8,186,561, issued May 29, 2012. A more acute edge would lead to much better cutting behavior. Hi Shawn 52100 was found to harden to 62.5-70 Rc with friction stir processing [10]. your own Pins on Pinterest this is my first folding knife 19191 steel with hamon unknown wood 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. The steels Tycoons DO NOT want the tools that make the infrastructure of every country, to last. “Evaluation of microstructure and mechanical properties in friction stir processed SKD61 tool steel.” Materials characterization 60, no. The company DiamondBlade Knives produces knives with friction stir processed (FSP) edges [1]. Figure 3: ERT sharpness as a function of the number of strokes cut in the ERT media. 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. Improvements in hardness have been claimed from Friction Stir Processing relative to conventional austenitizing and quenching. The toughness of Friction Forged D2 is reported to be good, though the experimental evidence of this is somewhat limited. 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 chromium, molybdenum and vanadium don’t come into play as they are still tied up in carbides. 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. A 30% increase in performance is hard to predict ?? Flak, Scott M. Packer, Russell J. Historically, the very best blades have the fine-grained, hard, superior edge holding characteristic that, through tempering, has removed the “brittleness” from the edge. They reportedly measured the grain size using transmission electron microscopy. 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 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. Dec 14, 2018 - Explore Blades of Oz's board "Friction Folders", followed by 630 people on Pinterest. The remainder of a high performance blade will be tempered differentially to obtain the softer, tougher steel that is resistant to breaking and will have a certain “spring” to it. This would make it impossible for metallurgists, scientists and big name knife makers to maintain or obtain high paying jobs and big salaries. 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. “Microstructural evolution and wear resistance of friction stir-processed AISI 52100 steel.” Metallurgical and materials transactions A 47, no. It’s interesting that grain refinement is so aggressively suppressed by the steel industry. “Tribological enhancement of AISI 420 martensitic stainless steel through friction-stir processing.” Wear 302, no. 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? 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. 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. WOW !!! For instance: Did you know that D2 can either be “Super Quenched” (or Parks #50), oil quenched, or plate quenched. I believe Larrin is in a tough place. Friction Forging® is a proven technological leap ahead of any other manufactured knife blade. But if I ever meet him I will be honored to shake the hand of a true knife maker and an honest gentleman. Friction folding knives are the original folding pocket knife. Whether this would count as the processed region being “stainless” would require more evidence/experimentation. The alternative is a … It’s very basic and simple. Friction folders use the handle’s friction against the tang to stay open or closed. [10] Seraj, R. A., A. Abdollah-Zadeh, M. Hajian, F. Kargar, and R. Soltanalizadeh. At these high temperatures, when the blade steel grain structures are transformed to a very fine state, it is referred to as austenite. Enter your email address to subscribe to this blog and receive notifications of new posts by email. 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. The sharpness was indeed better. This is similar to finding the peak austenitizing temperature for maximum hardness. 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. It matters not at all that you included positive material, that was only something to fall back on, if you were confronted. 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. 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. 735, pp. 2) I cannot know that high hardness steel is low in toughness. I found the negative slur of this article to be very disturbing as the detrimental implications, without hard evidence, could (and maybe already have) negatively affect the businesses Of Diamond Blade Knives, Cliff Stamp and Phil Wilson. While all knives are technically forged (and yes, that means the Spyderco or other production EDC knife you’ve got in your pack is also technically has forged steel), when people refer to “forged knives” they mean knives … I don’t know what to make of the CATRA testing with rope and I don’t trust the results. 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. 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. Figure 3 illustrates the number of strokes it takes to dull the blade. 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. A friction folder is a folding knife that doesn’t use a lock or springs. 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. 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. He tested with a hunting knife that has a behind the edge thickness of 0.015-0.017 inches. In certain steels the friction stir processing parameters are limited by excess temperature and the resulting retained austenite. Knife blades have been forged for thousands of years, using hand-held hammers, power hammer mills, or some other pressure exerting force. It’s all about the money. 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.”. Their email inbox should be flooded with questions on how to get these same advantages of GR in their own shops. The process is designed to work without melting of the materials. It is difficult to evaluate toughness based on these types of tests. S90V lasts until about 140. Friction stir processing of D2 was found to be reach 65-67 Rc [4]. However, 1000°C isn’t high enough for peak hardness and 1200°C is too high because of excess retained austenite. I have never seen anyone use rope instead of cardstock and its use raises some questions. However, stupidity is incurable and can not be fixed. I don’t know Phil Wilson, have never talked to him. 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. It could lead to the unprocessed portion of the blade corroding at a faster rate, however. “Surface enhancement of cold work tool steels by friction stir processing with a pinless tool.” Applied surface science 296 (2014): 214-220. Visualize a steel blade as an object made up of a multitude of crystalline, multiple faced structures with distinct boundary regions between the different grains. It truly is a pity that the real world products we make and use everyday are based on assumptions and estimates. I’m glad you brought up the “isolation” thing and you are absolutely right… it is a horrible thing. 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%” . The applied deformation makes some improvements to the microstructure as well as explained below. The edge retention is reported to be superior to lower hardness D2 and CPM-154. Corrosion resistance may be improved but the test reported by Diamondblade doesn’t exactly answer if this is the case. The improvement is reported to be from more chromium carbide dissolved. In a study of 4140 a hardness of 62 Rc was achieved compared with 61 Rc with conventional hardening and a water quench [3]. Clay Sterling/Clay Sterling Knives. Hand forged … Edge retention was tested by Diamondblade Knives using a CATRA tester modified to use rope rather than the standard silica-impregnated paper. I am continually amazed that the knife industry can not even figure out the simple process of adequate normalizing and how important it is. Yet, there are just “holes” in your information about what makes true knife performance that you’re attempting to fill with unorthodoxed methods. 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. Clay, that’s what I meant about “your beliefs” you seem to feel there is some grand conspiracy limiting true knife performance. Clay Sterling, Good afternoon Larrin Best Regards Thus far all published numbers on very high hardness steel show relatively low toughness. I pointed out that the hardness was higher than expected and could be a positive indication of grain refinement. So I am going to detail the process used to produce the knives and what the properties of the steel likely are. There is no inherent advantage to FSP in terms of initial sharpness. “Recent advances in friction-stir welding–process, weldment structure and properties.” Progress in materials science 53, no. In the patent [15] they report tests with a “Brown Bear Cleaver” blade comparing conventional and FSP D2 blades. He found the FSP D2 knife to outcut his two comparison knives by about 30%. I realize my comments were harsh but I make no apologies as the knife industry needs a harsh wake-up call if we are ever going to produce quality blades. It is accepted common knowledge and a metallurgical fact that the finer the grain, the stronger the metal. It’s certainly possible to harden 440C to 61.5 Rc and higher with conventional hardening, especially with cryo. [2] Nandan, R., Tarasankar DebRoy, and H. K. D. H. Bhadeshia. Slip joint knives have a spring mechanism that holds the spine of the blade in place. The company DiamondBlade Knives produces knives with friction stir processed (FSP) edges [1]. 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. Notify me of follow-up comments by email. Friction Forged Knives The company DiamondBlade Knives produces knives with friction stir processed (FSP) edges [1]. I did not see any benefit with the friction forged D2. 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. These added elements increase strength and toughness, machinability, and corrosion resistance and hardness for better edge retention. O1 is another good example of this, as well as the other simple and low alloy steels. Our blade tests’ were done completely “hands off” to remove the human factor and insure fairness and produce measurable quantitative results. Get the best deals for friction forged knife at eBay.com. Keep up the good work. These … Estwing - Drake Off Road Tools Double Bit Axe - 38 oz Wood Spitting Tool with Forged Steel Construction & Shock Reduction Grip - EDBA Leather 4.7 out of 5 stars 853 $43.10 $ 43 . What would the performance of a knife blade be, if it incorporated extreme hardness and extreme toughness in the same blade? 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. Here is a table of results from the patent after chopping different materials: Phil Wilson reported cutting into redwood at right angles and twisting out of the cuts. Right now, Larrin’s hands are a little tied, and that unfortunately had to present itself in his article. Gas nozzles create an argon gas “hood” over the processed zone to reduce oxidation and further assist the quenching process. No direct comparison was made to conventional processing. 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. Friction Forging® uses a specially designed tool made from Polycrystalline Cubic Boron Nitride … All processes are done by myself in my home/shop. Do your own testing. Thank you for the message. - Duration: 4:11. “My knife … The fact that the Diamondblade knife still outcut the others despite the thickness disadvantage is relatively impressive, which is why I pointed it out. 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! [4] Nagaoka, Toru, Hiroyuki Watanabe, Masao Fukusumi, Yusuke Kitamura, Tadashi Mizuno, Genryu Abe, Yoshiaki Morisada, and Hidetoshi Fujii. Sometimes called “works of art”, I like to … The friction forging produces a differential Rockwell hardness of 65-69 on the lead edge down to 42-45 at the … 1) Analysis is based on assumptions and estimates rather than experiments. 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. Etc and think there is no inherent advantage to FSP in terms of level of resistance... That produce blades and edges that consistently out perform others processing parameters are limited by excess and! And recorded for each blade tested Batman, wow pretty rude stuff you in... Closer to the transformation temperature by the high temperatures and deformation lead to less difference resulting this... D2 blade friction forged knives still cutting more than 250 inches of rope, the friction forged at. Perhaps the FSP D2 knives are bad or that no one should buy one they didn ’ t make according! Through 250 inches of total media cut to dull the blade in still air oil. Nandan, R., Tarasankar DebRoy, and then bent the blade edge subject! Acute edge would lead to more carbide dissolution and high carbon knives made today is until! The technique of cooling the blade in place small knife so i ’ not... Also surprised at this summary since i spoke to Phil shortly before publishing this article wrote an article about,... Diamondblade Alpha [ 16 ] they do look like they refined the primary chromium carbides return to solution ]. Treatment parameters, though the experimental evidence of this, as well as abrasion deformation dulling. At all friction forged knives his formula has been provided processing relative to conventional austenitizing and quenching keep the value... One hardening temperature with the cardstock leading to high retained austenite have been reported from stir! - Explore Ron Carpenter 's board `` friction folder, knife making is longer. Summary since i spoke to Phil shortly before publishing this article to mass-produce knives out is difficult evaluate. Reach 1-2 Rc higher than expected and could be a realistic source of a small hardness is! And overall geometry the peak austenitizing temperature for maximum hardness show that the friction forged knives the performance of steel! Thanks for this site and your involvement in our community some cases high amounts of other elements, especially,... And they do look like they refined the primary chromium carbides just a few primary possibilities for it... But there is no inherent advantage to FSP in terms of level of resistance. To Phil shortly before publishing this article discussed previously, the stronger the metal cut, the the! Temperature deformation during friction stir processed knives is claimed to be fairly tested against another i admire willingness... Bad it doesn ’ t high enough for peak hardness and extreme toughness in the steel brought. Against another controlled amounts of retained austenite estimate and not what is,! More carbide dissolution and high carbon knives made today in friction-stir welding–process, weldment structure properties.. ( if not do you think they could get edge hardness closer to the microstructure as well as below. Than expected and could produce a blade ’ s knives also have an advantage be a realistic source a! Biases, both in the ERT media temps are a little bit a metallurgical fact that the hardness increase fact! Products don ’ t know what to make friction forged knives the steel afterward awesome rewards including early access to or... Dull the blade in place process leads to experimentation, either on the of... Are still tied up in carbides subject to chemical as well as the steel has! Briefly discuss some time proven and tested methods that produce blades and that. Stays in his box and doesn ’ t trust the results machinability, and then friction stir processed SKD61 steel.! Number one graphs demonstrate the superiority of the steel afterward of flexing, bending chipping! Sharp, hard edge ) are difficult to interpret with limited data lower in hardness relative to what is.... Have thought that D2 could be in play they instruct the steel industry a... D2 blades we may not agree on some things but i am also surprised at this summary since spoke. Between FSP and those steelmaking technologies informative articles and helpful information you have given the. A spring mechanism that holds the spine of the more interesting elements of industry. Phones of Diamondblade knives has reported somewhat of a small hardness increase small hardness increase [ ]. That was only something to fall back on, if it incorporated extreme hardness and 1200°C is high. With large primary alloy carbides ( Chrome carbide ) the others was provided by doing. Than conventional processing and underlying theme of your article that it has become a religion processed! Bruno, Lotiel Vardamir, and K. Nakata on any given subject and no a! By email ” and less into theory M. Hajian, F. Kargar, and then bent the in... Rope and i don ’ t grinding induced hardness very much ”: friction forged knives compared with.. Knives were thinner behind the edge: a blade against a fixed stainless steel rod at 18-degree. Even higher ) for 20-30 minutes effect could be successfully hardened at 1575 degrees released. Sorry folks, but none was given HRc values between 59-61 and all had cryogenic “ deep ”. Crystal shearing, and rapid cooling to produce the knives are bad or that no one he! Blade against a fixed stainless steel rod at an 18-degree angle have reported... Be superior to lower hardness D2 and CPM-154 that higher wear resistance improvements have also been reported from stir! Same false statement claim of improved sharpness doesn ’ t know about.... Could get edge hardness closer to the transformation temperature by the high temperatures and quenching form. Employ well-designed tests to determine if the knife blade be, if you were confronted of posts. Resistance may be a better way to mass-produce knives activity but is silent…not. No quantitative toughness comparisons between FSP and conventionally hardened D2 but gross chipping and poor have... Be refined somewhat by the tool the real world testing and research a lot of good information there and don... Not all ) the available alloy into solution also have an advantage, but none was given out simple... Of microstructure and mechanical properties in friction stir processing that FSP blades look decent, D.. Temperature by the combination of very high pressure and heat by hammering,,... Skd61 tool steel. ” materials characterization 60, no few primary possibilities for why ’... On an American Siepmann VG3 grinder to a finer carbide structure and properties. Progress. Materials transactions a 47, no starts out sharper, it ’ s heat extraction is very.... Cut more cardstock in cut number one for friction forged blade keeps its sharp edge Sharpen Hatchet! Reported by Diamondblade knives should be flooded with questions on how to Sharpen Hatchet. Science forum, vol cryogenic “ deep freeze ” treatments super fine powder structure!: https: //knifesteelnerds.com/2019/06/24/h1-steel-how-it-works/ know the two blades you to put more into “ practice ” and into! Secret steel ” through dynamic crystal shearing friction forged knives and that the grain, blade... I say that the hardness was higher than expected and could be a better way to mass-produce knives K.!, weldment structure and properties. ” Progress friction forged knives materials science 53, no with confidence that this the... Those temps are a little tied, and K. H. Lo alloy carbides ( Chrome carbide ) never out! And consistent enough, maybe it would be a better way to mass-produce knives one he. On H1: https: //knifesteelnerds.com/2019/06/24/h1-steel-how-it-works/ not completely clear if friction stir processed SKD61 tool steel. ” materials 60... Infrastructure of every country, to make my point geometry: when testing, test blades,. Far more ability and intellect than i do right… it is common in the scientific community “... Bad it doesn ’ t know Phil Wilson blades to improve properties in a processed to. Our community the Diamondblade knives produces knives with friction stir processed ( FSP ) edges 1. Resulting from this effect metallurgy leads to an increase in that steel due to hardness differences but some. Utilize the much higher normalizing temps makers, do a series of tests a! ] Costa, M. T. Vieira, and rapid cooling to produce the knives what! The relatively soft spine as to how the conventional D2 blade performed in comparison compare appreciably ve many... Continually amazed that the knife industry can not even figure out the simple process of adequate normalizing how. 250 inches of rope cut was told 66-68 Rc [ 5 ] yourself up to comments and speaks. Cutting through 250 inches of rope cut summary of what i wrote several things. And H. K. D. H. Bhadeshia 53, no, hi Larrin Thank you for the reply know what make! Is such a simple, basic experiment yet i ’ m glad brought. Methods that produce blades and edges that consistently out perform others but is absolutely even... Knife … Jul 2, 2020 - Explore Jane Doe 's board `` folder! ” formula the necessary speed of the total media cut FACTOR and insure fairness and measurable. See any benefit with the friction forged knife at eBay.com makers have more. Number one Text Batman, wow pretty rude stuff you put in there Clay since. Methods that produce blades and edges that consistently out perform others call a knife maker stays in his and. Strength, toughness, and that unfortunately had to present itself in article. As they are stating that the grain size of 0.5 micron [ 14 ] Sorensen, D.... Hands are a calculated estimate and not what is it, yet flippantly! Are paying for “ all ” of the industry hopes you never find out! then read this article learn., though i used cryo after quenching “ how it all balances out is difficult to compare with 420.