Effect of quenching temperature on microstructure and properties of air-cooled bainite-martensite multiphase wear-resistant steel

doi:10.13251/j.issn.0254-6051.2023.03.022

Abstract

Abstract: An air-cooling bainite-martensite multiphase wear-resistant cast steel was designed, smelted, poured and heat treated. The effect of quenching temperature on microstructure and properties were studied by means of mechanical properties test, microstructure and fracture morphology observation, and X-ray diffraction analysis. The results show that after quenching at 900 ℃ for 1 h, air-cooling to room temperature, and then tempering at 300 ℃ for 2 h, and air-cooling to room temperature, the bainite-martensite multiphase wear-resistant cast steel with the best comprehensive mechanical properties is obtained, of which the tensile strength is 1729 MPa, elongation after fracture is 4.3%, Brinell hardness is 454 HBW, and V-notch impact absorbed energy is 19.31 J. Its microstructure contains about 10% retained austenite, which can improve the strength and toughness of the matrix.

Key words: multiphase wear-resistant steel, quenching temperature, mechanical properties, fracture morphology, retained austenite

CLC Number:

TG162.9

Yan Hongtao, Wang Yongjin, Qi Hailong, Huang Yan, Zhang Keming, Zhang Huandou, Mu Rong. Effect of quenching temperature on microstructure and properties of air-cooled bainite-martensite multiphase wear-resistant steel[J]. Heat Treatment of Metals, 2023, 48(3): 129-134.

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