Effect of quenching process on microstructure and mechanical properties of U75V heavy rail steel

doi:10.13251/j.issn.0254-6051.2020.12.011

Abstract

Abstract: Microstructure, mechanical properties and fracture morphology of U75V heavy rail steel as rolled and as quenched at 3 ℃/s and 5 ℃/s were studied by optical microscope, scanning electron microscope, hardness tester, impact testing machine and universal tensile testing machine. The results show that with the increase of quenching rate, the grain size of the steel is refined gradually, and the pearlite lamellar spacing decreases. Among them, the grain size and lamellar spacing of the steel as rolled are the largest, and that as quenched at 5 ℃/s are the smallest. Meanwhile, the comprehensive mechanical properties such as impact absorbed energy and hardness of the U75V steel are increased. Among them, the impact absorbed energy, hardness and tensile strength of the steel as rolled are the lowest, and that as quenched at 5 ℃/s are the best.

Key words: U75V heavy rail steel, quenching, microstructure, mechanical properties

CLC Number:

TG156.32

Ma Xiao, Cen Yaodong, Chen Lin, Wu Maowen. Effect of quenching process on microstructure and mechanical properties of U75V heavy rail steel[J]. Heat Treatment of Metals, 2020, 45(12): 59-62.

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