After vacuum gas quenching D2 tool steel, even if the surface hardness reaches HRC 58-60, the microstructure may still contain 15% - 25% Retained Austenite.
Since austenite is a soft and unstable phase, it leads to two major technical issues:
1. Hardness Limitation:Prevents the material from reaching its maximum potential of 62+ HRC.
2. Dimensional Instability:Over time, retained...
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