15N20 steel toughness

Your tests bear out my real-world experiences with 15N20.
Did not understand why my kitchen knives at 60-62 outperformed the 63+ knives. Now I know.
Thanks Larrin.
 
Larrin Larrin Are Si and Ni compatible to achieve even greater toughness?
At least one study found that silicon additions only contribute to better toughness at higher tempering temperatures, which might be less desirable for knife steels. I cited it here: https://knifesteelnerds.com/2018/10/22/silicon-additions-for-improving-steel-toughness/

That said, S5 (2% Si) has been tested to have very high toughness. And to more directly answer the question, 300M is a steel with both high Ni and Si, it is 4340 plus 1.6% Si.
 
At least one study found that silicon additions only contribute to better toughness at higher tempering temperatures, which might be less desirable for knife steels. I cited it here: https://knifesteelnerds.com/2018/10/22/silicon-additions-for-improving-steel-toughness/

That said, S5 (2% Si) has been tested to have very high toughness. And to more directly answer the question, 300M is a steel with both high Ni and Si, it is 4340 plus 1.6% Si.
Can you have an assumption of hardness and toughness of Bohlers K600? Composition in the screenshot. And is it possible to add that much Ni to 420HC to get more toughness without sacrificing hardness?1679758523844.png
 
Can you have an assumption of hardness and toughness of Bohlers K600? Composition in the screenshot. And is it possible to add that much Ni to 420HC to get more toughness without sacrificing hardness?View attachment 2129306
Hardness is in the 54hrc range after temper. I have some big choppers made in this steel. Toughness only Larrin and/or tests can answer, but it’s quite high.
 
If you temper it at 100C, I think so, but you probably will loose a lot of toughness.
 
Can you have an assumption of hardness and toughness of Bohlers K600? Composition in the screenshot. And is it possible to add that much Ni to 420HC to get more toughness without sacrificing hardness?View attachment 2129306
Adding 4% nickel to 420HC would definitely limit its max hardness.
 
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