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for sure overheating! been there done that.
got pics of the forge you use?
reducing the heat a but might help prevent this, or inserting something to shield the blade from direct contact of the flame.
as for this one, you could write it off as a learning tool, and snap in in the middle of the hot spot, to see the internal grain structure. or, try several normalizing cycles to get the grain size back to where you want it.
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