High-temperature tribological properties of coatings repaired by laser additive manufacturing on railway wheel tread damage
参考中译:车轮踏面损伤激光添加剂修复涂层的高温摩擦学性能


          

刊名：Wear
作者：Qian Xiao（State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University）
Shiyu Li（State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University）
Wenbin Yang（State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University）
Chunhui Yang（State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University）
Daoyun Chen（State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University）
Haohao Ding（Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University）
Wenjian Wang（Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University）
刊号：780LD003
ISSN：0043-1648
出版年：2023
年卷期：2023, vol.520/521
页码：204674-1--204674-11
总页数：11
分类号：TH117
关键词：Wheel material；Laser additive manufacturing；Partial repair coating；Self-fluxing powder；High-temperature wear
参考中译：车轮材料；激光添加剂制造；局部修复涂层；自熔性粉末；高温磨损
语种：eng
文摘：Heavy-duty train wheels can easily cause local damage. Laser additive manufacturing technology has obvious advantages in repairing local damage to train wheels. The high temperature sliding condition caused by tread braking is a severe test for the coating of damaged wheels repaired by laser additive. In this study, three self-fluxing alloy powders, Fe-, Ni-, and Co-based, which are the most widely used in laser cladding, were selected as repair materials. The sliding friction wear performance at high temperatures was evaluated with an HT-1000 ball-disk wear tester, and the wear mechanisms of the repair area, substrate, and counterpart surfaces of the specimens were analyzed. The results show that the microstructure of the coating after the surface damage of the wheel is repaired by laser additive is mainly composed of dendritic structure and eutectic structure. Compared with the base material, the hardness of Fe-, Ni-, and Co-based alloy cladding coatings is significantly improved. At the same time, the wear resistance of the repaired wheel steel samples was improved to different degrees. The wear mechanism of the repaired area of the Fe-based alloy sample is mainly adhesive wear, and the wear mechanism of the repaired area of the Ni-based alloy sample is adhesive wear and oxidation wear. However, the surface of the wear scar of the Co-based alloy repaired sample is relatively smooth, the damage is slight, and the friction reduction effect is the best.
参考中译：重型火车车轮很容易造成局部损坏。激光附加制造技术在修复火车车轮局部损伤方面具有明显的优势。由于踏面制动引起的高温滑动条件对激光修补剂修复破损车轮的涂层提出了严峻的考验。本研究选择了激光熔覆中应用最广泛的三种自熔性合金粉末Fe、Ni和Co作为修复材料。利用HT-1000型球盘磨损试验机对其高温滑动摩擦磨损性能进行了评价，并对试件的修复区、衬底和副表面的磨损机理进行了分析。结果表明，用激光添加剂修复车轮表面损伤后，涂层组织主要由枝晶组织和共晶组织组成。与母材相比，Fe、Ni、Co基合金熔覆层的硬度显著提高。同时，修复后的车轮钢试件的耐磨性也有不同程度的提高。铁基合金试件修复区的磨损机制主要为粘着磨损，镍基合金试件的修复区磨损机制主要为粘着磨损和氧化磨损。而钴基合金修复后的试件磨痕表面较为光滑，损伤轻微，减摩效果最好。



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