Did you remember to remove the decarb layer before testing hardness after your quenching attempts?
I emphasize this to my students as they have often twice as many (or more) heats in than I do when I do a piece and so it's more of a problem for them.
Brian, the oil is a mixture of hardening oil (that I bought from a steel company) and ATF transmission fluid. I haven't had problems hardening with it before.
Thomas, I ground the faces before hardening. So there shouldn't have been any significantly decarb layer? At the last time the file skated on the faces, at the previous tries it did not.
Attempt on a hammer; failure
in Heat Treating, general discussion
Posted
Brian, the oil is a mixture of hardening oil (that I bought from a steel company) and ATF transmission fluid. I haven't had problems hardening with it before.
Thomas, I ground the faces before hardening. So there shouldn't have been any significantly decarb layer? At the last time the file skated on the faces, at the previous tries it did not.
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