Effect of isothermal quenching on microstructure, hardness and tensile properties of H13 steel

doi:10.13251/j.issn.0254-6051.2023.10.020

Abstract

Abstract: Effects of isothermal quenching and tempering on microstructure, hardness and tensile properties of H13 steel were studied. The results show that with the decrease of isothermal temperature, the martensitic lath in microstructure of the H13 steel is segmented and refined by the increasing of the lower bainite. The hardness of the steel decreases with the increase of lower bainite. The tensile strength and elongation have the same variation trend, that is, with the increase of lower bainite, the tensile strength and elongation increase first and then decrease, and both reach the maximum value after isothermal holding at 340 ℃ for 75 min and then tempering at 560 ℃ for 2 h and at 540 ℃ for 2 h, which are increased by 23.5% and 36.2%, respectively, compared with that of the ordinary quenching. This indicates that there is a critical lower bainite volume fraction value for the effect of lower bainite in mixed microstructure of martensite and lower bainite(M/B_L) on the tensile properties of the H13 steel.

Key words: H13 steel, isothermal quenching, M/B_L mixed microstructure, tensile properties

CLC Number:

TG156.31

Zhang Jianping, Wei Jicheng, Fan Yingqing, Yong Hao. Effect of isothermal quenching on microstructure, hardness and tensile properties of H13 steel[J]. Heat Treatment of Metals, 2023, 48(10): 138-142.

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