Heat treatment process of 600 MPa hydroelectric steel based on orthogonal analysis method

doi:10.13251/j.issn.0254-6051.2024.07.047

Abstract

Abstract: Based on the orthogonal test analysis method, the effects of quenching temperature, quenching time, tempering temperature and tempering time on tensile strength and low temperature impact property of a 600 MPa hydroelectric steel were analyzed. The mechanical properties and microstructure evolution of the experimental steel under different heat treatment processes were studied. The results show that the main order of the influence on tensile strength of the experimental steel is quenching time, tempering temperature, quenching temperature and tempering time, and the main order of the influence on low temperature impact property is quenching time, tempering temperature, tempering time and quenching temperature. Prolonging the quenching time and increasing the quenching temperature are conducive to the increase of bainite content in the microstructure, which leads to the in strength of the experimental steel increase. The impact property of the experimental steel is positively correlated with the ferrite content in the microstructure. Under the heat treatment process of quenching at 900 ℃, holding for 75 min and tempering at 570 ℃, holding for 150 min, the microstructure of the experimental steel is lath bainite, granular bainite and a small amount of polygonal ferrite, which can achieve the optimal matching of strength and impact property.

Key words: 600 MPa hydropower steel, orthogonal experiment, heat treatment, mechanical properties

CLC Number:

TG142.7

Chen Jie, Gao Tianyu, Wang Shuang, Wang Yong, Wang Liangliang. Heat treatment process of 600 MPa hydroelectric steel based on orthogonal analysis method[J]. Heat Treatment of Metals, 2024, 49(7): 307-312.

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