车轮表面激光熔覆铁基粉末熔覆层组织研究  

Study on the Microstructure of Iron-based Powder Cladding Layer for Laser Cladding on Wheel Surface

作　　者：关天宇 张旭[1] GUAN Tianyu;ZHANG Xu(School of Locomotive and Rolling Stock Engineering,Dalian Jiaotong University,Dalian 116028,China)

机构地区：[1]大连交通大学机车车辆工程学院,辽宁大连116028

出　　处：《机械工程与自动化》2025年第1期160-161,164,共3页Mechanical Engineering & Automation

摘　　要：为了解决车轮磨耗问题,提出了一种新的解决方案,即在车轮上进行激光熔覆,并研究了熔覆后试样的材料性能。首先采用Fe基合金粉末在高速列车车轮所用钢CL60车轮试样上进行激光熔覆试验,涂层完成后,采用扫描电镜和X射线衍射对涂层的微观组织和物相分布进行了分析,发现涂层的微观结构可分为三层:第一层为树枝晶、胞状晶和粗大柱状晶,第二层为细小的胞状晶和树枝晶,第三层为细小的等轴晶;涂层的物相主要由(Fe、Ni)固溶体和碳化物Cr 7C 3组成。之后采用往复摩擦磨损实验分析了涂层的力学性能,发现涂层具有良好的耐磨性,相较于未处理试样,其磨损率降低了89.7%。In order to address the issue of wheel wear,this paper proposes a new solution,which is to conduct laser cladding on the wheels and study the material properties of the cladded samples.Firstly,laser cladding experiments were conducted using Fe-based alloy powder on CL60 steel wheel specimens used in high-speed trains.After the coating was completed,the microstructure and phase distribution of the coating were analyzed using scanning electron microscopy and X-ray diffraction.It was found that the microstructure of the coating can be divided into three layers:the first layer(dendritic crystals,cellular crystals,and coarse columnar crystals),the second layer(fine cellular crystals and dendritic crystals),and the third layer(fine equiaxed crystals).The main phases of the coating are composed of(Fe,Ni)solid solution and Cr 7C 3 carbides.Subsequently,reciprocating friction and wear tests were conducted to analyze the mechanical properties of the coating,and it was found that the coating exhibits excellent wear resistance.Compared to untreated specimens,its wear rate decreased by 89.7%.

关 键 词：车轮磨耗 激光熔覆 铁基合金粉末 材料性能 

分 类 号：TG178[金属学及工艺—金属表面处理]