Microstructure and properties of bainitic steel for frog used in intercity and high-speed railway track

doi:10.13251/j.issn.0254-6051.2021.08.014

Abstract

Abstract: Microstructure and mechanical properties of bainitic steel for intercity and high-speed railway frog were studied by means of optical microscope, scanning electron microscope, XRD, impact tester and universal tester. The results show that the bainite structure of the tested steel can be obtained under air cooling condition, and the structure is carbide free bainite determined by XRD analysis. The tensile strength of the tested steel is 1410 MPa, and the impact absorbed energy at room temperature is up to 89 J. The steel has a higher hardness, and good match of strength and toughness. The low-temperature impact test results show that the tested steel can meet the application requirements of the frog for intercity and high-speed railway track under low-temperature environment.

Key words: frog used in intercity and high-speed railway track, bainitic steel, microstructure, hardness, strength and toughness

CLC Number:

TG142.1

Li Yuan, Luan Daocheng, Hu Zhihua, Deng Tianxin, Ren Yang, Zuo Chengming, Wang Zhengyun. Microstructure and properties of bainitic steel for frog used in intercity and high-speed railway track[J]. Heat Treatment of Metals, 2021, 46(8): 70-72.

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