运用激光熔覆技术在ＡＩＳＩ１０４５钢表面制备了３０ｖｏｌ－％ＳｉＣｐ／Ｎｉ－Ｃｒ－Ｂ－Ｓｉ－Ｃ涂层。ＳＥＭ和ＴＥＭ观察分析表明：ＳｉＣｐ在熔覆过程中完全溶解；涂层结合区组织为共晶结构；涂层组织由初生石墨球Ｇ，分布在γ－Ｎｉ固溶体枝晶中的Ｍ２３（Ｃ，Ｂ）６细小网状树枝晶以及少量Ｎｉ＋Ｎｉ３（Ｂ，Ｓｉ）层片状共晶组成；Ｓｉ在Ｎｉ固溶体中的固溶度显著增大，高达１４．４１ｗｔ－％；Ｍ２３（Ｃ，Ｂ）６含有高密度堆垛层错；Ｎｉ３（Ｂ，Ｓｉ）相具有长周期结构。 A 30vol-% SiCp / Ni-Cr-B-Si-C coating was prepared on AISI1045 steel by laser cladding. SEM and TEM observations show that the SiCp is completely dissolved during the cladding process. The microstructure of the coating is eutectic. The microstructure of the coating is composed of primary graphite spheres G, M23 (C, B ) 6 fine reticular dendrites and a small amount of Ni e Ni3 (B, Si) lamellar eutectic composition; the solid solubility of Si in Ni solid solution increased significantly, up to 14.41 wt-%; M23 (C, B) High-density stacking fault; Ni3 (B, Si) phase has long-period structure.