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Originally Posted by Martyn4802
I've made a bunch of knives out of CPM 440V, and have not had any problems with brittleness, and blade chipping. I use Paul Bos for all of my heat treating
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This is a very important aspect of steel and knife making.
The Graham brother knife I dsiplayed is one of Paul's (S30V), as are my Striders. My wife has a two-inch Buck mini-Alpha Hunter heat treated by Paul, and they are all excellent, serviceable knives that produce keen edges.
Now, you also mention CPM-440V and the good luck you have with it. That proves the point. My example is my wife's Boa, an early example. Rumor has it that those blades had a
Rc hardness in the low to mid 60's. I doubt Paul had a hand in that.
(BTW, I had concoidal fracture in the bevel, itself.)
But as Martyn4802 underlines, we have to do research.