Effect of intercritical quenching temperature on microstructure and properties of Cr-Mn-Si low alloy steel

doi:10.13251/j.issn.0254-6051.2025.01.018

Abstract

Abstract: Effects of intercritical quenching temperature on the microstructure and mechanical properties of Cr-Mn-Si low-alloy ultra-high strength steel were investigated by using optical microscope (OM), scanning electron microscope (SEM), tensile tester and impact tester. The results show that when the tested steel is quenched within 790-850 ℃, the carbides gradually dissolve, the ferrite content decreases, the martensite content increases and the strength increases with the increase of quenching temperature within 790-820 ℃. When the quenching temperature is 830 ℃, the ferrite basically disappears, and the strength reaches the peak. When the quenching temperature is ≥850 ℃, the carbides disappear, and the microstructure is mainly composed of martensite+retained austenite, the strength and toughness basically remain unchanged. The best mechanical properties of the tested steel can be obtained by quenching at 850 ℃+tempering at 230 ℃ with the tensile strength of 1770 MPa, yield strength of 1447 MPa, elongation after fraction of 12%, reduction of area of 53% and impact absorbed energy of 71 J.

Key words: Cr-Mn-Si low-alloy ultra-high strength steel, intercritical quenching, microstructure, mechanical properties

CLC Number:

TG156.1

Gao Xin, Li Mingdong, Su Jie, Jiang Qingwei, Xia Shihong, Zhang Yongqiang, Ning Jing. Effect of intercritical quenching temperature on microstructure and properties of Cr-Mn-Si low alloy steel[J]. Heat Treatment of Metals, 2025, 50(1): 119-125.

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