高速动车组EA4T车轴激光增材修复研究  

Research on Laser Additive Repair Technology for EA4T Axle of High-Speed Rolling Stock

作　　者：何广忠 郑成功 刘伟亮 HE Guangzhong;ZHENG Chenggong;LIU Weiliang(CRRC Changchun Railway Vehicles Co.,Ltd.,Changchun 130062,China)

机构地区：[1]中车长春轨道客车股份有限公司,吉林长春130062

出　　处：《电焊机》2022年第10期37-44,共8页Electric Welding Machine

摘　　要：为验证激光增材修复技术在高速动车组车轴损伤修复应用中的可行性,在车轴基材上开展了激光修复工艺试验,重点研究激光功率和扫描速度对熔覆质量的影响,通过分析研究不同激光功率、扫描速度下所得试样的宏观熔覆形貌、宏观金相分析、显微硬度、金相组织等,筛选出较优的工艺参数,并进一步对熔覆试样的拉伸性能、冲击性能、应力腐蚀及疲劳试验等多项力学性能检测。结果表明,采用优化后的工艺参数在EA4T上激光熔覆IN625镍基粉末,其熔覆试样拉伸性能优于母材标准要求,冲击性能优于基材的冲击性能,疲劳寿命与基材相当,达到了车轴服役性能的要求,可用于后续高速动车组EA4T车轴上的修复。To verify the feasibility of laser additive repair technology in the application of high-speed rolling stock axle damage repair, this paper carried out experiments on the relevant laser repair process on the axle substrate, focusing on the influence of laser power and scanning speed on the melt quality, designing different parameter combinations to improve the melt layer morphology during the melting process, and obtaining melt specimens with good surface forming condition respectively. By analyzing and studying the macroscopic cladding morphology, macroscopic metallographic analysis, microhardness, metallographic organization, etc., and the better process parameters were selected, and further mechanical properties such as tensile properties, impact properties, stress corrosion, and fatigue tests were performed on the clad specimens. The result show that, when the optimized process parameters are used to laser cladding IN625 nickel base powder on EA4T, the tensile properties of the cladding specimen are better than the standard requirements of the base material, impact properties better than the impact properties of the base material, and fatigue life comparable to that of the base material, meeting the requirements of the axle service performance, which can be used for the subsequent repair of EA4T axles of high-speed rolling stock.

关 键 词：激光增材修复 EA4T车轴 微观组织 力学性能 

分 类 号：TF124[冶金工程—粉末冶金]