Retained austenite can improve toughness, but beyond certain amounts it gives us problems. Low yield strength (the steel deforms like it is lower in hardness) and difficulty in deburring.GarageBoy wrote: ↑Tue Nov 24, 2020 10:25 am"However, this steel has high hardness and corrosion resistance which can mean excess retained austenite which sometimes leads to inflated toughness values. This behavior was seen with M390 when austenitizing too high. And with some users reporting difficulty in deburring S110V (usually means high retained austenite), I’m not sure I would actually recommend heat treating S110V from 2150°F despite the apparent superior hardness-toughness balance."
So the higher austenitizing temperature leads to more hardness for the same toughness (which sounds good), but that is offset with too much retained austenite?
Hopefully the advancements keep coming!
Titanium carbide steels are definitely not unheard of, it is especially common as a "microalloy" element. I don't see any titanium alloyed tool steels though apart from scattered journal articles. It is an even stronger carbide former than niobium which means it is even more limited in how much you can use before the carbide size starts to shoot up.The Mastiff wrote: ↑Tue Nov 24, 2020 12:31 pmI've had S110v at rc 64.5 and the highest S90V hardness I've tried was around rc 59 ish. I had always thought the S110v was designed to perform at the higher hardnesses. It's one of the few stainless steels I really respect and has been since I bought a high performing custom from Phil at http://www.seamountknifeworks.com/
Larrin, is there any serious work being done with titanium carbide steels and with what results?
You did a good job using language, which is linear/sequential, to describe the complex interrelated properties of various alloying elements, which is most definitely not strictly linear. That is tough to map onto language.