熔烧状态对Co基合金涂层显微结构及硬度的影响

Effect of melting state on microstructure and microhardness of Co-based alloy coating

采用高频感应真空熔覆技术,制备钴基合金涂层。使用扫描电子显微镜观察涂层在不同深度的组织结构,用X射线能谱仪(EDS)探测涂层的化学元素组成,用显微硬度计测量涂层不同深度的显微硬度值。试验结果表明,熔烧状态的不同对涂层和基体化学元素之间扩散程度有显著的影响。熔烧时间越长,扩散程度越大。钴基合金涂层的硬度显著高于Q235钢基体,其显微硬度随着熔烧时间的延长而略有降低,但其硬度更均匀。

Co-based alloy coating was prepared by high-frequency vacuum induction cladding technology. Microstructure of the coatings was observed by use of scanning electron microscope, the chemical composition were analyzed by EDS and the microhardness was measured at different depths of the coating. Experimental results show that the melting state has a significant effect on diffusion of chemical elements between the coating and substrate, and the diffusion intensity increases with melting time prolonging. Hardness of the cobah-based alloy coating is significantly higher than that of the substrate Q235 steel, however its microhardness decreases with melting time prolonging, but the hardness distribution is more uniform.