高能脉冲类激光熔覆镍基合金层的组织及性能  

Microstructures and properties of Ni-based alloy cladding coating by high-energy pulsed like-laser

作　　者：张松[1] 李丹[1] 崔文东[2] 谭俊哲[2] 关锰[2] ZHANG Song LI Dan CUI Wen-dong TAN Jun-zhe GUAN Meng(School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China Nuclear Power Pump Industry Co. Ltd., Shenyang Blower Works Group Corporation, Shenyang 110869, China)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870 [2]沈阳鼓风机集团核电泵业有限公司,沈阳110869

出　　处：《沈阳工业大学学报》2017年第2期132-136,共5页Journal of Shenyang University of Technology

基　　金：国家自然科学基金资助项目(51271126);国家重点研发计划项目(2016YFB1100204);国家科技专项基金资助项目(2013ZX06002-002);沈阳市科技局计划项目(F16-032-0-00)

摘　　要：为了提高304不锈钢表面的综合性能,采用高能脉冲类激光熔覆沉积技术在304不锈钢表面制备了镍基合金熔覆层.采用扫描电子显微镜、能谱仪、X射线衍射仪、销-盘磨损试验机与电化学测试系统对镍基合金熔覆层的显微组织、相结构、耐磨损性能和电化学腐蚀性能进行了研究.结果表明,镍基合金熔覆层与304不锈钢基材呈良好的冶金结合,熔覆层的相对耐磨损性为304不锈钢基材的4.4倍.熔覆层组织由γ-Ni基体相、Ni_3Mo、Fe_7Mo_3和Cr_(23)C_6碟状增强相与不规则棒状增强相组成.增强相是提高耐磨损性能的主要原因,增强相与基体相的电极电位差是导致腐蚀电流密度增加的主要原因.In order to improve the comprehensive surface properties of 304 stainless steel,the Ni-based alloy cladding coating was prepared on the surface of 304 stainless steel with the high-energy pulsed like-laser deposition technology. The microstructure,phase constituent,wear resistance and electrochemical corrosion performance of Ni-based alloy cladding coating were studied with scanning electron microscope（ SEM）,energy dispersive spectroscope（ EDS）,X ray diffractometer（ XRD）,pin-disk wear tester and electrochemical test system. The results showthat the Ni-based alloy cladding coating has good metallurgical bonding to 304 stainless steel,and the relative wear resistance of Ni-based alloy cladding coating is 4. 4 times high as that of304 stainless steel. The microstructure of Ni-based cladding coating is composed of γ-Ni matrix phase,Ni3 Mo,Fe7 Mo3and Cr23C6butterfly-like hard reinforcing phases and irregular rod-like hard reinforcing phase. The hard reinforcing phases are the key reason for improving the wear resistance. The electrode potential difference between the hard reinforcing phases and matrix phase is the main reason for the increase of corrosion current density.

关 键 词：高能脉冲类激光 熔覆 镍基合金 组织形貌 显微硬度 磨损 电化学腐蚀 极化曲线 

分 类 号：TG178[金属学及工艺—金属表面处理]