Effect of quenching temperature on microstructure and mechanical properties of a medium alloy martensitic wear-resistant cast steel

doi:10.13251/j.issn.0254-6051.2021.09.023

Abstract

Abstract: A self-designed medium alloy martensitic wear-resistant cast steel was quenched at 900, 950, 1000, 1050, 1100 ℃ then tempered respectively, and the influence of quenching temperature on microstructure and mechanical properties of the tested steel was studied. The results indicate that the microstructure of the tested steel after quenching and tempering is composed of lath martensite and retained austenite. When the tempering temperature is kept constant at 250 ℃, with the increase of quenching temperature, the martensite structure first becomes finer and then coarser, and the tensile strength, impact properties and residual austenite content increase first and then decrease. The tested steel achieves the best comprehensive mechanical properties at 1050 ℃: tensile strength of 1623 MPa, impact property value of 14.4 J, the corresponding strengthening mechanism is twin martensite and high-density dislocation entanglement. And the wear behavior and the wear mechanism of the tested steel under this process are explained by the impact wear test.

Key words: martensite, wear-resistant cast steel, medium alloy steel, quenching, microstructure

CLC Number:

TG156.3

Yu Hongjun, Chen Zhengjia, Chi Xiaoming, Pei Zhongzheng, Cheng Fuchao, Xu Jie, Wang Yongjin. Effect of quenching temperature on microstructure and mechanical properties of a medium alloy martensitic wear-resistant cast steel[J]. Heat Treatment of Metals, 2021, 46(9): 133-137.

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