Journal
WEAR
Volume 330, Issue -, Pages 592-599Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.wear.2015.02.053
Keywords
Laser cladding; Wheel/rail materials; Lanthanum oxide; Fe-based alloy; Wear
Funding
- National Natural Science Foundation of China [51174282]
- Sichuan Province Science and Technology Support Program [2014GZ0009-6]
- Innovative Research Teams in University [IRT1178]
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The aim of this study is to investigate the influence of laser cladding Fe-based alloy on microstructure and wear characteristic of wheel/rail materials using a rolling-sliding wear testing apparatus. Especially, the effect of lanthanum oxide on the properties of laser cladding coating was explored in detail. The results show that the laser cladding Fe-based alloy coating consists of dendrites and eutectic and is composed of (Fe, Ni) solid solution and Cr7C3 carbide. The hardness and wear-resistance of wheel/rail materials are enhanced using laser cladding. The wear and surface damage of wheel/rail rollers dramatically alleviate owing to the refinement of the microstructure when adding lanthanum oxide into laser cladding coating. The wear mechanism of wheel/rail rollers turns from severe spalling and delamination wear (untreated specimens) to slight peeling (with 1.2% La2O3). Furthermore, the plastic deformation of wheel/rail rollers undergoing laser cladding is significantly thinner than that of untreated rollers. In summary, laser cladding Fe-based alloy coating can be used to prolong the wear life of wheel and rail materials. (C) 2015 Elsevier B.V. All rights reserved.
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