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Your stock should be coming already normalized and ready for profiling, grinding the bevels, and drilling the holes. You will still probably want to heat cycle the blades to relieve any stresses, or at least even them out, that occurred during grinding and to refine the grain. The problem is going to be with putting the optimal amount of carbon into solution to hit that sweet spot that will give you maximum hardness without creating retained austenite. As I said, this is a little hard with just trying to spot decalesence and holding at that place for a few minutes. With 1084 you can put all the carbon into solution with the iron and create very little retained austenite. There's just not that much carbon in the alloy.
Yes, you can try to get around the retained austenite problem by soaking the blade in liquid nitrogen. The problem here is that the dewars for the liquid nitrogen are not cheap. I don't know about the liquid nitrogen. People have different opinions if you can get 52100 cold enough to get the retained austenite to convert to martensite with a dry ice/acetone bath. If you try that do it outside and away from flames.
Doug
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