汽车传动轴表面激光熔覆与激光重熔同步修复法的工艺与组织性能研究  

The Process and Microstructure Properties of Laser Cladding and Laser Remelting Synchronous Repair Automobile Drive Shaft Surface

作　　者：张强 莫清烈 周丽云[3] Zhang Qiang;Mo Qinglie;Zhou Liyun(Guangxi Polytechnic Vocational Institute of Technical,Chongzuo,Guangxi 532200,China;Guangxi University of Science and Technology,Liuzhou,Guangxi 545006,China;Guangxi Normal University for Nationalities,Chongzuo,Guangri 532200,China)

机构地区：[1]广西理工职业技术学院,广西崇左532200 [2]广西科技大学,广西柳州545006 [3]广西民族师范学院,广西崇左532200

出　　处：《应用激光》2021年第4期765-772,共8页Applied Laser

基　　金：广西高校中青年教师科研基础能力提升项目(2019KY1662)。

摘　　要：提出一种在汽车传动轴材料上进行边快速熔覆边重熔的修复方法,采用316L不锈钢粉末与纳米SiC颗粒的复合材料作为熔覆粉末,通过试验研究了修复层的孔隙率、显微组织、物相、硬度、残余应力以及抗拉强度。结果表明:修复层孔隙率从底部到顶部依次减小,主要由细小的枝晶与胞晶组成,物相成分包含γ-CrFeNi、M7C3、FeSi、SiC等4种,平均显微硬度最高达到577 HV±9.5 HV;熔覆层的每一层均得到了同步重熔,使应力得到大部分释放形成残余压应力,且修复层的平均抗拉强度、弹性模量、伸长率分别达到835.5 MPa±22.0 MPa、110.6 GPa±17.0 GPa、25.3%±0.6%。A repair method of rapid cladding and remelting on automobile transmission shaft material is proposed. The composite material of 316 L stainless steel powder and nano SiC particles is used as the cladding powder. The porosity, microstructure, phase, hardness, residual stress and tensile strength of the repair layer are studied by experimental characterization. The results show that the porosity decreases from the bottom to the top of the repair layer, which is mainly composed of fine dendrite and cellular crystal, and the phase composition contains γ-CrFeNi、M7C3、FeSi、SiC. Besides, the average microhardness was 577 9.5 HV. Each layer of the cladding has been remelted synchronously, and most of the stress is released to form residual compressive stress. The average tensile strength, elasticity modulus and elongation are 835.5 MPa ± 22.0 MPa, 110.6 GPa± 17.0 GPa and 25.3% ± 0.6%, respectively.

关 键 词：激光熔覆 激光重熔 汽车传动轴 显微组织 力学性能 

分 类 号：TG17[金属学及工艺—金属表面处理]