Optimization of heat treatment process and analysis of mechanical properties of U76CrRE heavy rail steel

doi:10.13251/j.issn.0254-6051.2022.11.010

Abstract

Abstract: Effect of isothermal treatment process on microstructure and mechanical properties of the U76CrRE heavy rail steel was studied by optimizing the process based on the on-line heat treatment with continuous cooling. The results show that the cooling rate before phase transformation, isothermal temperature and isothermal time jointly affect microstructure and mechanical properties of the U76CrRE heavy rail steel. At the optimum cooling rate of 8 ℃/s before phase transformation, the lower the isothermal temperature and the shorter the isothermal time, the finer the pearlite structure obtained. The tensile strength of the U76CrRE heavy rail steel increases with the decrease of isothermal temperature and isothermal time. Isothermal treatment at 560 ℃ for 30 s is the optimum heat treatment process for the U76CrRE heavy rail steel, under which the comprehensive mechanical properties are the best, the tensile strength is 1370 MPa, the hardness is 390 HBS, the elongation after fracture is 9.33%, the percentage reduction of area is 41.32%, and the impact absorbed energy is 4.4 J.

Key words: isothermal treatment, U76CrRE heavy rail steel, process optimization, microstructure, mechanical properties

CLC Number:

TG156.1

Wang Yeshuang, Liu Xinyu, Su Hang, Duan Yanan, Cen Yaodong, Chen Lin. Optimization of heat treatment process and analysis of mechanical properties of U76CrRE heavy rail steel[J]. Heat Treatment of Metals, 2022, 47(11): 64-69.

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