ZG0Cr16Ni5Mo表面电火花熔覆WC-8Co硬面涂层的性能研究  

Performance of WC-8Co Hard Surface Coating on ZG0Cr16Ni5Mo by the Electro-spark Cladding Technique

作　　者：郭鹏[1] 张瑞珠[1] 王建升[1] 严大考[1] 李静瑞[1] 

机构地区：[1]华北水利水电学院,河南郑州450011

出　　处：《稀有金属材料与工程》2013年第S2期545-548,共4页Rare Metal Materials and Engineering

基　　金：水利部948项目(201048);河南省重点科技攻关项目(122102210241)

摘　　要：采用电火花表面熔覆技术,在水轮机材料ZG0Cr16Ni5Mo表面进行修复和强化,形成熔覆层。结合扫描电镜、X射线衍射仪、显微硬度测量仪和摩擦磨损试验机对熔覆层显微组织、物相组成、显微硬度和耐磨性能进行了分析。结果表明,熔覆层组织均匀、连续,与基体材料冶金结合,厚度约30μm;熔覆层主要由Fe3W3C、Co3W3C、W2C和(Fe0.51Mn0.46Ni0.03)6C等相组成;熔覆层显微硬度(HV)最大值达到17695 MPa,比基体硬度3000 MPa高出约5倍,耐磨性能是基体的3.49倍;熔覆层中细小的晶粒和碳化物硬质相的弥散分布是提高硬度和耐磨性的主要因素。经过一个汛期的应用结果表明,电火花表面熔覆技术在水电厂水轮机表面具有巨大的应用价值和广阔的应用前景。The electro-spark cladding technique was used to repair and strengthen the surface of hydraulic turbine material ZG0Cr16Ni5Mo stainless steel,and a new cladding coating was formed.The microstructure,phases,microhardness and wear-resistance of the cladding coating were investigated by means of scanning electron microscopy(SEM),X-ray diffraction(XRD),microhardness test and friction and wear test.The results indicate that the cladding coating is uniform,continuous and metallurgically boned with the substrate.The thickness of the coating is about 30 μm.The coating consists of Fe3W3C,Co3W3C,W2C and(Fe0.51Mn0.46Ni0.03)6C phases.The maximum hardness(HV) is 17695 MPa,which is 5 times higher than that of the substrate(3000 MPa),and its wear resistance is 3.49 times of the substrate.Fine grains and carbine hard phases,which distribute dispersedly in cladding coating,are the main factors of high hardness and better wear resistance.After a flood season,the application results show that the electro-spark cladding technique has great value and board application prospects on hydroelectric turbine surface.

关 键 词：电火花表面熔覆技术 熔覆层 显微组织 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]