The ability of quenched steel to resist the decrease in hardness during tempering is called tempering stability. Since the alloy element can hinder or delay the transformation of the quenched steel during tempering, it can delay the decomposition of martensite and the transformation of retained austenite, increase the recrystallization temperature of ferrite, and make it difficult for carbides to aggregate Grow up while maintaining a large degree of dispersion. Therefore, the tempering stability of alloy steel is better than that of carbon steel. A higher tempering temperature can be used for steel with higher tempering stability, the quenching stress can be eliminated more thoroughly, and the comprehensive mechanical properties after tempering can also be better.
