基于316L过渡层的431不锈钢激光熔覆层组织与性能研究  

Study on microstructure and properties of 431 stainless steel laser cladding layers based on 316L transition layers

作　　者：高玉龙 周礼龙 付娟[3] 赵勇[3] 冯乃强 许海洋 杨明 GAO Yulong;ZHOU Lilong;FU Juan;ZHAO Yong;FENG Naiqiang;XU Haiyang;YANG Ming(CRRC Qingdao Sifang Rolling Stock Co.LTD.,Qingdao 266000,China;Aerospace Engineering Equipment(Suzhou)Co.LTD.,Suzhou 215104,China;School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China;Jiangsu Yangzi Mitsui Shipbuilding Co.Ltd.,Taizhou 225300,China)

机构地区：[1]中车青岛四方机车车辆股份有限公司,青岛266000 [2]航天工程装备(苏州)有限公司,苏州215104 [3]江苏科技大学材料科学与工程学院,镇江212003 [4]江苏扬子鑫福造船有限公司,泰州225300

出　　处：《江苏科技大学学报（自然科学版）》2024年第4期32-35,48,共5页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：国家重点研发计划资助项目(2018YFC0310400);江苏省高等学校自然科学研究面上项目(18KJB460007);工信部高技术船舶“中型邮轮设计建造技术研究”资助项目(MC-201917-C09)。

摘　　要：采用激光熔覆技术制备316L不锈钢涂层作为过渡层,在过渡层表面激光熔覆431马氏体不锈钢作为表面熔覆层.通过OM和SEM观察分析了熔覆层截面的微观组织特征,并借助XRD分析了熔覆层和过渡层的物相组成,利用显微硬度仪和电化学工作站测试熔覆层的硬度分布和耐腐蚀性.试验结果表明:加入过渡层后获得的熔覆层表面光滑平整,没有气孔裂纹等缺陷;表面熔覆层由马氏体、铁素体和少量残余奥氏体组成,过渡层由奥氏体组成;整个熔覆层的硬度从顶端向下呈现出梯度减小,表面熔覆层的硬度为538 HV,比基材提高了3倍,过渡层的平均硬度为300 HV;熔覆层的腐蚀电流为0.9569×10^(-6) A/cm^(2),腐蚀电位为-0.16644 V,熔覆层的耐腐蚀性优于基材.316L stainless steel was prepared as the transition layer by laser cladding technology,and 431 martensitic stainless steel was used as the surface cladding layer on the transition layer.The microstructure of the cladding layer was analyzed by OM and SEM,and the phase composition of the cladding layer and transition layer was analyzed by XRD.The hardness distribution and corrosion resistance of the cladding layer were tested by microhardness tester and electrochemical workstation.The test results show that the surface of the cladding layer obtained by adding the transition layer is smooth and flat,and there are no porosity cracks and other defects.The surface cladding layer is composed of martensite,ferrite and a small amount of residual austenite,and the transition layer is composed of austenite.The hardness of the cladding layer decreases gradually from the top to the bottom.The hardness of the surface cladding layer is 538HV,which is 3 times higher than that of the substrate,and the average hardness of the transition layer is 300HV.The corrosion current of the cladding layer is 0.9569×10^(-6) A/cm^(2),the corrosion potential is-0.16644 V,and the corrosion resistance of the cladding layer is better than that of the substrate.

关 键 词：激光熔覆 马氏体不锈钢 过渡层 硬度梯度 耐腐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]