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利用5kW连续波CO2激光器在16Mn钢基材表面对预置的添加20vol%SiCP的Co基合金粉末进行激光熔覆得到Co基SiC合金涂层(CoSiC)。研究了合金涂层的组织形貌及相结构,并与激光熔覆钴基合金涂层(Co55)进行了显微镜硬度及滑动磨损性能的对比试验。结果表明,CoSiC合金涂层组织由涂层底部的细密胞状共晶组织和涂层中上部的树枝状亚晶共晶组织所组成,主要组成相为γ-Co,Cr7C3,Cr23C6,CoSi2,Cr3Si及Si2W等。添加SiCp被完全溶解。激光熔覆CoSiC涂层比Co55涂层具有更高的硬度和耐磨性,并分析了其强化机理。
A Co-based SiC alloy coating (CoSiC) was obtained by laser cladding a preset 20 vol% SiCP Co-based alloy powder on a surface of a 16 Mn steel substrate by using a 5 kW continuous wave CO2 laser. The microstructure and phase structure of the alloy coating were investigated. The microstructure and phase structure of the alloy coating were compared with that of Co55 coated by laser cladding. The results show that the microstructure of CoSiC coating is composed of fine-celled eutectic microstructure at the bottom of the coating and dendritic eutectic microstructure in the upper part of the coating. The main phases of the coating are γ-Co, Cr7C3, Cr23C6, CoSi2, Cr3Si and Si2W and so on. Add SiCp is completely dissolved. Laser cladding CoSiC coating has higher hardness and wear resistance than Co55 coating, and its strengthening mechanism is analyzed.