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    NbC和WC添加量对激光熔覆Stellite6-NbC和Stellite6-WC合金复合涂层组织和性能的影响

    Effect of NbC and WC Addition on Microstructure and Properties of Laser Cladding Stellite 6-NbC and Stellite6-WC Alloy Composite Coating

    • 摘要: 采用正交试验设计法对2Cr13不锈钢表面激光熔覆Stellite6合金涂层的工艺进行优化,采用优化工艺制备Stellite6-NbC和Stellite6-WC合金复合涂层,NbC和WC添加量(质量分数)均分别为1%,3%,5%,7%,10%,研究了复合涂层的显微组织、显微硬度及耐蚀性能。结果表明:激光熔覆Stellite6合金涂层的最佳工艺参数为激光功率1 600 W,送粉量40 g·min−1,扫描速度17 mm·s−1;采用最佳工艺制备的2种合金复合涂层的组织都均匀致密,涂层与基材形成良好的冶金结合,Stellite6-NbC合金复合涂层的组织更均匀细小。随着NbC和WC添加量的增加,2种合金复合涂层的平均显微硬度均增大,且均高于基体和纯Stellite6合金涂层,腐蚀速率均下降,且均低于基材和纯Stellite6合金涂层。相同添加量下Stellite6-NbC合金复合涂层的平均显微硬度和腐蚀速率均比Stellite6-WC复合涂层高,平均显微硬度高10~40 HV。

       

      Abstract: The orthogonal experimental design method was used to optimize the laser cladding process of 2Cr13 stainless steel surface Stellite6 alloy coating. The Stellite6-NbC and Stellite6-WC alloy composite coatings were prepared by the optimized process. The addition amount (mass fraction) of NbC and WC was 1%, 3%, 5%, 7%,10%, respectively. The microstructure, microhardness and corrosion resistance of the composite coatings were studied. The results show that the optimal process parameters of laser cladding of Stellite6 alloy coating were laser power of 1 600 W, powder feeding capacity of 40 g · min−1, scanning speed of 17 mm · s−1. The microstructure of the two alloy composite coatings prepared by the best process was uniform and dense, and the coating formed a good metallurgical bond with the substrate. The microstructure of the Stellite6-NbC alloy composite coating was more uniform and fine. With the increase of the amount of NbC and WC, the average microhardness of the two alloy composite coatings increased, which was higher than the matrix and pure Stellite6 alloy coating, and the corrosion rate decreased, which was lower than the substrate and pure Stellite6 alloy coating. The average microhardness and corrosion rate of Stellite6-NbC alloy composite coating were higher than those of Stellite6-WC composite coating with the same additive amount, and the average microhardness was 10‒40 HV higher.

       

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