Cr12Mo1V1钢表面激光熔覆Fe基合金熔覆层组织与性能的研究  

Research on Microstructure and Performance of Laser Cladding Fe-based Alloy Coating on Surface of Cr12Mo1V1 Steel

作　　者：吴鹏飞 魏昕[1] 屈海艳 李京波 WU Pengfei;WEI Xin;QU Haiyan;LI Jingbo(Faculty of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China;School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学机电工程学院,广东广州510006 [2]广东工业大学材料与能源学院,广东广州510006

出　　处：《热加工工艺》2022年第6期99-102,共4页Hot Working Technology

摘　　要：选用Cr12Mo1V1钢作为基体材料,Fe基合金粉末为熔覆材料,以同步送粉的方式在基体表面进行激光熔覆实验。利用金相显微镜、扫描电镜、显微硬度计和摩擦磨损实验机等分析熔覆层的显微组织和性能。结果表明:熔覆层和基体结合处出现了一道明亮区,底部大多由胞状晶组成,熔覆层中部出现较多的树枝晶和粗大的柱状晶,熔覆层顶部出现较多的等轴晶。测得基体的平均硬度为241.78 HV0.2,熔覆层的平均硬度为493.22 HV0.2,熔覆层的硬度为基体的2.04倍,表明熔覆层的硬度比基体明显提升。基体的平均摩擦系数为0.456,而熔覆层的平均摩擦系数为0.375,比基体的略有减小。Taking Cr12Mo1V1 steel as base material, selecting Fe-based alloy powder as cladding material, the laser cladding test was carried out on the surface of the substrate by synchronous powder feeding. The microstructure and properties of the cladding layer were analyzed by metallographic microscope, scanning electron microscope(SEM), microhardness testers and friction and wear testers. The results show that there is a bright region at the junction between the cladding layer and the substrate. The bottom is mostly composed of cell crystals. There are more dendrites and coarse columnar crystals in the middle of the cladding layer, and more equiaxed crystals appear at the top of the cladding layer. The average hardness of the substrate is measured to be 241.78 HV, the average hardness value of the cladding layer is 493.22 HV, and the hardness of the cladding layer is 2.04 times of that of the substrate, indicating that the hardness of the cladding layer is significantly higher than that of the substrate. The average friction coefficient of the matrix is 0.456, and the average friction coefficient of the cladding layer is 0.375, which indicates that the friction coefficient of the cladding layer is slightly lower than that of the substrate.

关 键 词：激光熔覆 Cr12Mo1V1钢 显微组织 摩擦磨损 

分 类 号：TG174.44[金属学及工艺—金属表面处理]