Effect of cryogenic treatment on microstructure and mechanical properties of H13 steel

doi:10.13251/j.issn.0254-6051.2024.10.006

Abstract

Abstract: Microstructure evolution and mechanical properties of the H13 steel during cryogenic treatment for different time (0-4 h) were studied. The phases and microstructure were analyzed by XRD and SEM, and the mechanical properties were characterized by hardness, impact and tensile tests. The experimental results show that the cryogenic treatment can refine martensite laths, promote the transformation of retained austenite to martensite and the precipitation of banded carbide. The increase of C content in martensite results in increasing in lattice constant and in lattice distortion effect, and a shift to the left in the XRD diffraction peak. With the prolongation of cryogenic treatment time, the strength and hardness of the steel show an upward trend, while the toughness and plasticity gradually decrease. Under the condition of maintaining the same hardness, the plasticity of the H13 steel after cryogenic treatment is comparable to that of the normal heat treatment, and its strength and toughness are improved.

Key words: hot working mold steel H13, cryogenic treatment, microstructure, impact property, tensile property

CLC Number:

TG156.91

Di Yingnan, Ma Dangshen, Zhou Jian, Chi Hongxiao, Gu Jinbo. Effect of cryogenic treatment on microstructure and mechanical properties of H13 steel[J]. Heat Treatment of Metals, 2024, 49(10): 38-42.

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