Abstract
1. Two-stage quenching (with subsequent tempering) provides an increase in the impact toughness, bending strength, and hardness of steel Kh12M compared to single-stage quenching, and especially to standard quenching in oil. Use of two-stage quenching and tempering instead of the standard heat treatment increases the hardness of the steel by 0.5HRCe and doubles the impact toughness and the bending strength. 2. The optimum combination of properties of steel Kh12M (within the study performed) has been provided by two-stage quenching by a regime of 1030°C→250°C 5 min →560°C 60 min. 3. Two-stage quenching by the latter regime increases the tempering resistance of steel Kh12M by suppressing the processes of segregation and coagulation of cementite-type carbides in the range of tempering temperatures of 200–350°C. 4. Two-stage quenching of steel Kh12M has been shown to double the service life of dies relative to the standard heat treatment.
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