Effect of thermal fatigue on microstructure and mechanical properties of B/M multiphase H13 steel

doi:10.13251/j.issn.0254-6051.2020.08.004

Abstract

Abstract: In order to improve its thermal fatigue property, H13 steel was B/M multiphase heat treated to obtain a tempered sorbite+bainite multiphase microstructure. The effect of thermal fatigue on the microstructure, carbide and mechanical properties of the B/M multiphase H13 steel was investigated by means of OM, SEM, TEM, Rockwell hardness tester and universal tensile testing machine. The results show that contrast to the phenomenon of rapid decrease of hardness with the increase of fatigue circle for the traditional H13 steel, the hardness of B/M multiphase H13 steel decreases first and then rises and then decreases with the increase of fatigue circle. The tensile experiments show that the strength-plasticity cooperating of the B/M multiphase H13 steel is better than that of the traditional H13 steel, and its percentage reduction of area increases after the thermal fatigue. It is found from microscopic observation that the main reason for the change in mechanical properties is the bainite lath merging and carbide precipitation and coarsening in the B/M multiphase H13 steel during thermal fatigue.

Key words: B/M multiphase H13 steel, thermal fatigue, carbide, mechanical properties

CLC Number:

TG142.1

Li Yangcheng, Cheng Xiaonong, Luo Rui, Wei Jiabo, Zhang Jie, Gao Tianming. Effect of thermal fatigue on microstructure and mechanical properties of B/M multiphase H13 steel[J]. Heat Treatment of Metals, 2020, 45(8): 17-21.

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