【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Nb C/Stellite6和WC/Stellite6合金复合涂层，Nb C和WC添加量（质量分数）均分别为1%,3%,5%,7%,10%，研究了Nb C或WC添加量对复合涂层显微组织、显微硬度及耐蚀性能的影响。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1600W，送粉量40g·min^-1，扫描速度17mm·s^-1；采用最佳工艺制备的2种复合涂层的组织都均匀致密，涂层与不锈钢基体形成良好的冶金结合，Nb C/Stellite6合金复合涂层的组织更均匀细小。随着Nb C或WC添加量的增加，复合涂层的平均显微硬度均增大，且均高于不锈钢基体和未添加WC或Nb C的Stellite6合金涂层，腐蚀速率均下降，且均低于不锈钢基体和未添加WC或Nb C的Stellite6合金涂层。添加Nb C制备的复合涂层的平均显微硬度和腐蚀速率均比添加WC制备的复合涂层高，平均显微硬度高10～40HV。更多还原

【Abstract】 The process of laser cladding Stellite6 alloy coating on 2Crl3 stainless steel surface was optimized by orthogonal experimental design methods.The NbC/Stellite6 and WC/Stellite6 alloy composite coatings were prepared by the optimized process with addition amount（mass fraction） of NbC and WC of 1 %,3%,5%,7%,10 %.The effects of NbC or WC addition on 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 listed as follows:laser power of 1 600 W,powder feeding capacity of 40 g·min^-1 and scanning speed of 17 mm·s^-1.The microstructure of the two composite coatings prepared by the optimal process was uniform and dense,and the coatings formed a good metallurgical bond with the substrate.The microstructure of the NbC/Stellite6 alloy composite coating was more uniform and fine.With the increase of the addition amount of NbC or WC,the average microhardness of the composite coatings increased,which was higher than that of the substrate and Stellite6 alloy coating without WC or NbC,and the corrosion rate decreased,which was lower than that of the substrate and Stellite6 alloy coating without WC or NbC.The average microhardness and corrosion rate of the composite coating prepared by adding NbC were higher than those of the composite coating prepared by adding WC,and the average microhardness was 10-40 HV higher.更多还原