运用激光熔覆技术在４５＃钢表面制备了ＷＣｐ增强Ｎｉ－Ｃｒ－Ｂ－Ｓｉ－Ｃ复合涂层。含量为３０ｖｏｌ－％ＷＣ典型涂层的ＸＲＤ，ＳＥＭ和ＴＥＭ分析表明，ＷＣｐ在熔覆的熔化阶段发生部分溶解和分解。激光熔体凝固时形成的微观组织由Ｎｉ＋Ｎｉ３Ｂ共晶基体上分布的杆（或薄片）状α－Ｗ２Ｃ，块状β－Ｗ２Ｃ和四方形η１碳化物Ｍ６Ｃ相组成。这类碳化物主要含Ｗ，并含大量Ｃｒ。销－环式干滑动磨损试验表明，当ＷＣｐ含量约为３０ｖｏｌ－％时，磨损抗力最大 WCp reinforced Ni-Cr-B-Si-C composite coating was prepared on the surface of 45 steel by laser cladding. XRD, SEM and TEM analysis of the typical coatings with the content of 30vol-% WC show that the WCp partially dissolves and decomposes during the melting phase of the cladding. The microstructure formed during the laser melt solidification consists of rods (or flakes) α-W2C, massive β-W2C and tetragonal η1 carbides M6C phases distributed on the Ni + Ni3B eutectic matrix. This type of carbide contains mainly W and contains a large amount of Cr. Pin-ring dry sliding wear test showed that when the WCp content of about 30vol-%, the wear resistance maximum