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Cal G

52100 SPLITS IN HALF

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I forged a San Mai blade out of 416SS and 52100. I have made about 20 of these and never had a problem.
I heat treated it 1500 Deg F and tempered at 400 Deg F.
Everything was fine, I looked at the blade two days later and everything was fine on the 3rd day I decided to finish the blade.
When I picked the blade up the handle had split on the end about 2 inch back. The 416 did not spit from the 52100, but the 52100 spit right in half.
Has anyone ever seen this happen or can offer an explanation as to why it would happen ?

SPLIT HANDLE.jpg

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Not uncommon on san-mai with different hardenability.  I haven't seen it do that that long after the quench, though, usually it's instant...  :huh:  It's due to too fast a quench.  The harder steel "freezes" while the softer one doesn't, or at least not as quickly.  Upon later cooling it shrinks after the core steel can't, and boom!

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