EFFECT OF LASER QUENCHING ON MICROSTRUCTURE AND PROPERTIES OF THE SURFACE OF TRACK MATERIALS

Xue-Long Ping, Han-Guang Fu, Kai-Ming Wang, Shu-Ting Sun, Jiang Ju, Jian Lin, Da-Wei Yi, Zhen-Guo Xing and Yong-Ping Lei
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Xue-Long Ping: School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, P. R. China
Han-Guang Fu: School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, P. R. China
Kai-Ming Wang: School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, P. R. China
Shu-Ting Sun: School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, P. R. China
Jiang Ju: School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, P. R. China
Jian Lin: School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, P. R. China
Da-Wei Yi: #x2020;School of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, Shaanxi Province, P. R. China
Zhen-Guo Xing: #x2021;Engineering Research Center of Hebei for Abrasion Resistant Metal Matrix Composite, Handan 056000, Hebei Province, P. R. China
Yong-Ping Lei: School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, P. R. China

Surface Review and Letters (SRL), 2018, vol. 25, issue 08, 1-10

Abstract: With the rapid development of rail transit, the wear problem of track has become a serious challenge. Laser quenching is a new surface modification process, and it is expected to improve the service life of the track. Laser quenching was carried on the surface of rails by using 6kW fiber laser. The microstructure, hardness, wear resistance, and contact fatigue resistance (CFR) of the phase transformation hardening layer were studied by optical microscope (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), microhardness tester, and wear tester. The results show that the microstructure of the hardened layer is composed of fine martensite and a small fraction of retained austenite. The microstructure of substrate is pearlite and ferrite. The hardness of rails quenched by the laser increased nearly two times than that of the un-treated track materials. When the laser power is 1000W, the depth of hardened layer reaches 0.8mm, and the wear resistance of hardened layer increases 167% than that of the substrate. The number, length, and depth of fatigue cracks decreased on the cross-section of worn rails after laser quenching, which indicates that laser quenching can improve the CFR of rails.

Keywords: Laser quenching; rails; microstructure; hardness; wear resistance; contact fatigue resistance (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1142/S0218625X19500306

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