Effect of intercritical quenching and tempering on microstructure and mechancial properties of 600 MPa HSLA steel

doi:10.13251/j.issn.0254-6051.2021.06.012

Abstract

Abstract: A 600 MPa high strength low alloy (HSLA) steel was heat treated by quenching and tempering, and influence of different tempering temperature and different quenching temperature on its microstructure and mechanical properties were investigated. The results show that the tensile strength, yield strength and yield ratio of the steel decrease with the increase of tempering temperature, but the elongation increases gradually. Type II temper brittleness appears when the tempering temperature is above 620 ℃, which result in sharp decrease of the impact performance. When the quenching temperature reaches 820 ℃, ferrite+granular bainite microstructure is obtained, which is conducive to preventing the crack propagation and ensure high impact performance.

Key words: high strength low alloy (HSLA) steel, intercritical quenching, microstructure, mechanical properties

CLC Number:

TG156

Yang Peng, Zhang Pengyan, Ji Jiuzhang. Effect of intercritical quenching and tempering on microstructure and mechancial properties of 600 MPa HSLA steel[J]. Heat Treatment of Metals, 2021, 46(6): 59-64.

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