铁基材料表面的激光熔覆工艺与显微组织及耐磨性研究  

Research on the Microstructure and Wear Resistance of Laser Cladding WC-Ni Composite Coating of the Fe-based Materials Surface

作　　者：顾正[1] 张光钧[1] 祝辉[1] 

机构地区：[1]上海工程技术大学激光工业技术研究所,上海201620

出　　处：《应用激光》2009年第6期481-488,共8页Applied Laser

基　　金：上海市重点学科建设项目(项目编号:J51402);国家自然科学基金面上资助项目(项目编号:50772066)

摘　　要：针对球墨铸铁与40Cr两种不同基体,采用不同的激光熔覆工艺,对其表面熔覆镍基纳米碳化钨,形成一种高耐磨的复合涂层。通过扫描电镜(SEM)分析了其显微组织,并利用X射线衍射仪(XRD)和能谱仪(EDS)对其组织成分、组织中存在的相进行了分析。结果表明,选择合适的激光处理参数,可在激光熔覆层内形成以WC为主的碳化物强化相,该强化相主要以网络状均匀分布于铁镍合金基体组织中,碳化物强化相尺寸相当一部分在纳米或微纳米量级,形成了一种组织细小并且显微组织软硬相间的熔覆层,明显提高了耐磨性。The composite layers with good wear resistance were formed by different parameters of laser cladding on the substrates of nodular cast iron and 40Cr. The microstructure of the layers were characterized by scanning electron microscopy （SEM）, the compositions and phases were determined by X-ray diffraction （XRD） and energy dispersive spectrometer （EDS）. The strengthening phase which was constituted mostly by WC particle, were uniformly distributed around matrix and Nickelbased materials in the layers with mesh pattern. The particles are nanometer or sub-nanometer size and improved the wear resistance of the cladding layers for they contribute to the microstructure alternated with hard and soft phase.

关 键 词：激光熔覆 碳化钨 复合涂层 耐磨性 

分 类 号：TG156.99[金属学及工艺—热处理] TG146.21[金属学及工艺—金属学]