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运用激光熔覆技术在16Mn钢表面制备了钴基合金涂层(Co55)、含20%SiCp(体积分数,下同)的钴基合金涂层(CoSiC)以及含20%B4Cp钴基合金涂层(CoB4C),比较研究了合金涂层的组织、相结构、显微硬度及滑动磨损性能。结果表明:合金涂层由涂层结合区的胞状共晶组织及涂层区的树枝状亚共晶组织组成,CoSiC涂层及CoB4C涂层的树枝晶比Co55涂层的更细小;B4Cp及SiCp在熔覆过程中完全熔解,其分解出的B,C,Si与涂层中的合金元素结合形成了更多的化合物,Co55涂层由γ Co和(Cr,Fe)7C3组成,CoSiC涂层由γ Co,Cr7C3,Cr23C6,CoSi2,Cr3Si和Si2W组成,CoB4C涂层由γ Co,Cr7C3,Cr23C6,CrB,CrB2和Fe23(C,B)6组成;3种激光熔覆涂层的显微硬度及耐磨性由高到低的顺序为CoB4C→CoSiC→Co55。对涂层的强化机理进行了分析。
A cobalt-based alloy coating (Co55), a cobalt-based alloy coating (CoSiC) containing 20% SiCp (volume fraction) and a cobalt-based alloy coating containing 20% B4Cp (CoB4C). The microstructure, phase structure, microhardness and sliding wear properties of the alloy coating were studied comparatively. The results show that the alloy coating consists of the cellular eutectic and the dendritic eutectic in the coating zone. The dendrites of the CoSiC coating and the CoB4C coating are finer than that of the Co55 coating. B4Cp and SiCp In the cladding process completely melt, the decomposition of B, C, Si and alloying elements in the coating to form more compounds, Co55 coating by γ Co and (Cr, Fe) 7C3 composition, CoSiC coating Composed of γ Co, Cr7C3, Cr23C6, CoSi2, Cr3Si and Si2W, the CoB4C coating consists of γ Co, Cr7C3, Cr23C6, CrB, CrB2 and Fe23 (C, B) 6; 3 kinds of laser cladding coatings microhardness And the descending order of wear resistance is CoB4C → CoSiC → Co55. The strengthening mechanism of the coating was analyzed.