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Thanks Stuart.
I guess all I was saying is the toughness got better and the best, Best O1 knives I ever made were cryo'd spent 3 days under dry ice. There is some science behind it, but I first encountered dry ice for HT 4140 parts. The results were remarkable, but I spent days trying to find out how to do it.
Do AEB-L steel with dry ice. It is called for and the steel won't work right without it.
HT to this day has some fuzzy edges. Some are solid, but some are fuzzy like O1 cryo. What I read a long time ago is that any steel with chrome will cryo. Why the article focused on chrome is not something I know, but there was a time after reading that article I thought that all steels with minute amounts of chrome needed cryo and cryo for knives just barely came out.
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