Jeremy, some might call it edge quench. But what I did was to carefully heat the edge to critical temperature with a torch and then just quench the whole blade.
I mean no disrespect when I say this, but this needs to be done very carefully. I don't recommend just anyone to do it. I have seriously considered the possibility that I can overheat the edge causing the grain to enlarge leading to an inferior blade. Point is that I don't just grab up a torch and do it. All sound rules of steel treatment should be followed. Heating by forge, oven, or torch has to be in a controlled manner to get the best results. This is not a disclaimer. It's fact. Experiment and test.