The third machine tests a blade’s strength by resting a blade against a fixed stainless steel rod at an 18-degree angle. Sincerely Cliff Stamp summarized reports of testing by different forum members on their experiences with Diamondblade Alpha [16]. So I am going to detail the process used to produce the knives and what the properties of the steel likely are. - Duration: 4:11. It matters not at all that you included positive material, that was only something to fall back on, if you were confronted. I assume this is purely due to hardness differences but perhaps some other effect could be in play. Thank you for the reply. So it appears that the grain refinement from friction stir processing is leading to a hardness increase. Figure 1 shows that the Friction Forged® blade starts out sharper, cutting 50% more material per stroke at the outset. WOW !!! The first sentence in each numbered paragraph is a summary of the criticism and the rest is my response. -blade is friction forged D2 -edge is 0.030" thick, 14-15 dps -blade is 0.105" thick, 2.57" long -weighs 2.5 oz. 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.”. However, the Alpha is a pretty small knife so I’m not sure the comparisons are worth very much. I can guarantee, you will get absolutely nowhere. 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. When combined with the REST data, this can be used to determine the depth of rope cut and the number of cuts before the shaving sharp edge is lost. Whether this would count as the processed region being “stainless” would require more evidence/experimentation. Friction folding knives are the original folding pocket knife. REMOVE THE HUMAN FACTOR: Be “hands off”. Get the best deals for friction forged knife at eBay.com. Diamondblade Knives is a sub-company of Knives of Alaska. After cutting through 250 inches of rope, the blade is still cutting more than 0.2 inches per stroke. Extreme examples are flint, ceramic and glass. 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. Friction stir processing is used to improve properties in a processed zone without welding anything. The carbide structure and high hardness would lead to “good” at best toughness. 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. 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. 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 normalizing temperature for highly spheroidized 52100 is 1900 degrees f (or even higher) for 20-30 minutes. Using a fully annealed sample of 52100, do a series of tests with increasingly higher normalizing temps. Read this article to learn more about retained austenite. Friction Forging® is a proven technological leap ahead of any other manufactured knife blade. This process looks promising, I really would like to see some more testing and samples of the knives for more people to try out. Spine Rc … Obviously this brings up some questions. What if the forgers ever realized that O1 with the proper heat treat could make S7 look like a brittle steel…and do so at a high hardness? Their email inbox should be flooded with questions on how to get these same advantages of GR in their own shops. Even very brittle steel can perform relatively impressive feats if given sufficient geometry. 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. [3] Lorenzo-Martin, Cinta, and Oyelayo O. Ajayi. Sharpness was nearly equal between the four knives according to the test (higher force in N means lower sharpness). I don’t know Phil Wilson, have never talked to him. 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? WOW !!! 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. Friction Forging® plasticizes the forged area and Chromium carbides return to solution. Our research has developed techniques and made technological advances that take manufactured knife-edge performance to the next level. Figure 3 illustrates the number of strokes it takes to dull the blade. 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. 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. When friction stir processing steel, the high heat that is generated in combination with rapid cooling leads to a process similar to hardening steel: the steel is “austenitized” and quenched to form hard martensite. The article claims that “all blades had identical edge geometry.” However, based on the resulting edge retention test this doesn’t seem likely. Friction Forged Knives. “Friction stir processing of D2 tool steel for enhanced blade performance.” In TMS Annual Meeting, pp. 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 commented on the H1 article and then read this and have to ask isn’t grinding induced hardness very much like FSP? 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. The grain structures are extremely fine “nanosized” at less than 0.5 microns and thus allow a super hard, tough edge that will hold a “shaving sharp edge” longer than any other knife blade material tested under strict laboratory conditions. We will briefly discuss some time proven and tested methods that produce blades and edges that consistently out perform others. 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 alternative is a … I am also surprised at this summary since I spoke to Phil shortly before publishing this article. Friction stir processing of D2 was found to be reach 65-67 Rc [4]. 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. There is no inherent advantage to FSP in terms of initial sharpness. We as knife makers, do not want your assumptions and calculations. 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. Hand forged … This prevents edge degradation due to corrosion. Blades are forged, shaped, reground and heat treated, handles are fitted and a custom leather sheath is made. 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. Hand Forged Knives Minnesota MadeWelcome to NorthStar Forge Minnesota’s premier knife makers for custom made knives, swords, metal jewelry, knife accessories, and more. 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. If all you have is Parks #50, it will probably get you by in a pinch…but if at all possible I would suggest “Super Quench”. Performance Forged in Steel: How DiamondBlade Knives are made! It could lead to the unprocessed portion of the blade corroding at a faster rate, however. Steel, and Hobie Smith. Here is another interesting statement in your article: “At such high hardness the toughness of D2 is not expected to be very high, and I wouldn’t think that grain refinement would significantly change that.” That statement has two assumptions (“is not expected to be” and “I wouldn’t think”) and a bald-faced lie. : ERT Sharpness (inches of rope cut per stroke) as a function of the total media cut. This is important as it highlights potential biases, both in the work and his own…. You ought to try it some time…who knows, you might even find out it’s a better product than Parks #50 ?? Different edge angle. The steel industry is the Denomination…the Industry Standard is the bible, doctrines, covenants and by-laws…and the forums and colleges are the churches where the members congregate freely to receive their daily dose of stupidity. I got 65-67 Rc with heat treatments of D2 that utilized cryo, and Diamondblade Knives is claiming a similar or even higher hardness value without using cryo. The chromium, molybdenum and vanadium don’t come into play as they are still tied up in carbides. 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. I don’t know what to make of the CATRA testing with rope and I don’t trust the results. so they quickly run back to their little box where they are safe from all that. It truly is a pity that the real world products we make and use everyday are based on assumptions and estimates. Any normal person can educate themselves on any given subject and no longer be ignorant. No amount of justifying on your part will change that. But not only does it starts out sharper, it stays sharp longer. So the claim of improved sharpness doesn’t make sense according to their own data: 2. Keep on with these great articles and reviews. CLiff Stamp had a pass around with a knife, but there was an unrelated issue if I remember right that led to the termination of the pass around. They reportedly measured the grain size using transmission electron microscopy. Accordingly, the ERT test was run until the REST value was greater than 3. Before the invention of slipjoint and locking knives, all folding knives used the friction of the blade tang against the handle and the pressure of your … But the Friction Forged D2 still had a REST value less than 3.0 with more than 250 inches of rope cut. Knife blades have been forged for thousands of years, using hand-held hammers, power hammer mills, or some other pressure exerting force. Ordinary D2 loses its shaving ability at about 10 inches of rope cut. It is difficult to evaluate toughness based on these types of tests. [7] Costa, M. I., D. Verdera, M. T. Vieira, and D. M. Rodrigues. It is an excellent product and works very well for the simple steels. [16] http://www.cliffstamp.com/knives/evaluations/alpha_1.html, Hi Larrin The next best material, S90V, was reduced to cutting only 0.2 inches per stroke at about 75 inches of total media cut. Corrosion experiments in FSP-processed steels have revealed corrosion resistance improvements. Diamond Blade Knives 6,691 views 4:11 How to Sharpen a Hatchet or Axe to a Scary Sharp Edge! Thanks to Keith Coleman, Paul Bruno, Lotiel Vardamir, and Lennart Palkovits for becoming Knife Steel Nerds Patreon supporters! 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