Study on Heat Treatment Process of H13 Hot Work Die Steel
The effects of quenching and tempering temperatures on the microstructure and mechanical properties of H13 hot work die steel were investigated by using metallographic microscopy,scanning electron microscopy,microhardness testing,and tensile testing.The findings revealed that secondary tempering treatment and appropriate reduction in tempering temperature result in the effective precipitation of finer and more dispersed carbides and the complete release of quenching stress.As a result,the hardness and toughness of H13 hot work die steel were significantly improved.Notably,when the quenching temperature was 1 000 ℃ and the tempering temperature was 520 ℃,the mechanical properties are superior,characterized by smaller tempering martensite size and more uniform structural distribution.Under these conditions,the hardness measureed 487 HV,the tensile strength reached 1 779 MPa,and the elongation was 11.5％.The analysis of the tensile fracture morphology reveals the presence of numerous dimples in the specimen after the tempering process,indicative of typical ductile fracture characteristics.Furthermore,a model was developed to describe the softening behavior of H13 steel during tempering in the temperature range of 520 ℃ to 600 ℃.
H13 hot work die steelmicrostructuremechanical propertiesheat treatment
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