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O1 is basically fool proof to heat treat as long as you are getting to the right temperature. If the blades are not hard, e.g. the file is cutting them, then you are not getting hot enough. I...

There could be a number of factors that make it possible for the quench to be the problem. Steel hardens in the quench at the speed of sound (see John Verhoeven's book on heat treatment). First it...

Based on your description, part of the edge was at the correct temperature. The key is to have a uniform temperature over the intended portion to harden. Skip's recommendation for a magnet test...