Investigation of a novel functionally graded material for the repair of premium hypereutectoid rails using laser cladding technology
Investigation of a novel functionally graded material for the repair of premium hypereutectoid rails using laser cladding technology
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DOI：
10.1016/j.compositesb.2017.07.089
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发表时间：
2017-12-01
影响因子：
13.1
通讯作者：
Soodi, Mehdi
中科院分区：
文献类型：
--
作者：
Lai, Quan;Abrahams, Ralph;Soodi, Mehdi
研究了熔覆方向、预热和后热处理对钢轨激光熔覆修复层组织和力学性能的影响。采用带送粉装置的光纤激光枪对优质过共析钢轨进行了410L不锈钢粉末的激光熔覆。研究了两种不同的熔覆方向和不同的热处理制度。通过改变熔覆方向并采用预热和后热相结合的热处理工艺，在钢轨轨头及其热影响区（HAZ）建立了良好的组织一致性。采用光学显微镜和扫描电镜对熔覆层和热影响区的显微组织进行了分析。采用XRD、EDS、EBSD等分析手段研究了复合材料的相组成和分布。通过剪切试验和维氏压痕试验，得到了与显微组织相关的轮轨接触条件下熔覆层的力学和摩擦学性能指标。皇冠版权所有（C）2017由爱思唯尔有限公司发布。保留所有权利。
In this study, the effects of cladding direction, preheating and post heat treatment on microstructural and mechanical properties of laser cladded rail repairs are presented. Laser cladding of a premium hypereutectoid rails grade with 410L stainless steel powder were conducted using a fibre laser gun with a powder feeder. Two different cladding directions and different heat treatment regimes were investigated. An excellent microstructural consistency was established across the railhead and its heat affected zone (HAZ) by changing cladding direction and using a heat treatment consisting of pre-heating and post-heating. The microstructure of the cladding layer and HAZ were characterized by optical microscopy and SEM. Phase identification and distribution were investigated by using XRD, EDS, and EBSD. Indications of the mechanical and tribological performance of the cladding layer in wheel-rail contact were obtained via shear punch tests and Vickers indentation, which demonstrated great correlation with the obtained microstructure. Crown Copyright (C) 2017 Published by Elsevier Ltd. All rights reserved.