I have a couple knives that will not sharpen like the rest. I just heat treated a small cleaver that is a replica of the first I made. The second gets really sharp but the first will not. After looking at the first under the microscope I think the grain size is too big due to the heat treat. The weird thing to me is that the second cleaver that gets sharp was heated a bit hotter than the first. Does the grain size get smaller up until the correct heat is reached and then start growing? I am just curious why the blade heated a lot less would have a larger grain.
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