Effects of quenching and tempering temperature on microstructure and mechanical properties of Cr-Mo wear-resistant steel

doi:10.13251/j.issn.0254-6051.2025.01.014

Abstract

Abstract: Effects of quenching temperature and low temperature tempering temperature on microstructure and mechanical properties of a Cr-Mo wear-resistant steel were investigated. The results show that the lath of tempering martensite of the tested steel after tempering is coarsened with the increase of quenching temperature, leading to the decrease of the strength, ductility and toughness. The hardness of the steel after quenching at 1060 ℃ and tempering is higher than that of quenching at 860 ℃ and tempering, which is due to the higher solution strengthening caused by more solution element during quenching isothermal stage. When the quenching temperature is 860 ℃, the strength and toughness first increase and then decreases with the increase of tempering temperature. The optimal tensile strength and impact absorbed energy at -40 ℃ are obtained when tempered at 200 ℃, which are 1607 MPa and 43.9 J, respectively, while the product of strength and elongation decreases to the lowest grade when tempered at 280 ℃. With the tempering temperature further increasing, the strength and toughness increase slightly. When the quenching temperature is 1060 ℃, the strength gradually decreases with the tempering temperature increasing, while the toughness first decreases and then has a little increment. The optimal tensile strength and impact absorbed energy at -40 ℃ are obtained when tempered at 160 ℃, which are 1494 MPa and 45.4 J, respectively.

Key words: quenching temperature, tempering temperature, hardness, impact property, carbides

CLC Number:

TG142.1

Li Zhongbo, Hu Haijiang, He Ping, Ren Ke, Yuan Qing, Wu Run. Effects of quenching and tempering temperature on microstructure and mechanical properties of Cr-Mo wear-resistant steel[J]. Heat Treatment of Metals, 2025, 50(1): 88-96.

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