in the blade for fear of cracking someone else's knife blade, lessening the liability and lessening the performance overall. This hasn't gone unnoticed in the musical instrument field, and many instruments and bells are now cryogenically treated. He can fit the cryo portion of the process into a more convenient time schedule. If a knife blade is in transformation (in ANY part of the heat treating process or has been hit by a hammer, heated by a torch, or deformed any way during or after heat treating, here's what will happen: There will be substantial and detrimental. The steel should come out of the process clean, and only slightly discolored (from heat only). Pearlite in the whole is not a phase; it's a combination of two phases: one layer is of the iron carbide cementite, and the other layer of ferrite (alpha-ferrite). There is no standard recipe for steels; even the process itself can vary. That's fine, but don't expect him to create a knife better than any other mass-marketed product, and don't expect to be successful at it, unless he's building a company about cheaper and easier.
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Where is the line? It's clearly hypoeutectoid, and the exact percentage keys me into the fact that though hardenable, the martensite finish temperature is just about at room temperature, so in hardening operations, simply heating it up and quenching it in water would bring it to its maximum hardness. 52100 is a hypereutectoid alloy steel, with much higher carbon than AEB-L. Even to finish martensite transformation, the temperature of -150F must be reached, and this cannot be done with dry ice or even with shallow cryogenics. Martensite contributes greatly to the strength and wear resistance of the steel. Page Topics The Straw Man of Toughness straw man (str man noun intentionally misrepresented proposition that is set up because it is easier to defeat than an opponent's real argument. I'm going to go into a detailed critique of this book, but after studying it thoroughly, and discussing it with other metallurgists and engineers, it's clearly written to sell a very particular type of steel to knifemakers. Also, consider that heat treatment contractors do not typically know who the manufacturer or foundry of the steel is, and there are some variations of treatment between steel blades coming from different sources. If a ten thousand dollar processor and hundreds of dollars of liquid nitrogen per heat treat is not in your budget, there are other means and reasons to build your own equipment for this procedure. They are designated by the identifier "PH." The only one that is classified as martensitic is 17-4PH, so let's look at the very best precipitation hardening alloy content for some real education. Sigma phase ( -Phase ).