中文摘要：

通过施加动态边界条件和超声振动热效应转化相结合的方法近似处理超声振动边界条件,研究了超声作用下激光熔覆SiC/316L复合涂层的残余应力,并探讨了超声振幅和扫描速度对复合涂层残余应力的影响。根据优化结果采用超声辅助激光熔覆制备SiC/316L复合涂层。结果表明：超声振幅和扫描速度对涂层表面x方向应力、y方向应力、界面处剪切应力和von Mises应力均有明显影响。当超声振幅为10μm,扫描速度为10mm/s时,SiC/316L复合涂层有较好的残余应力缓和效果。超声空化或机械效应及声流作用促使SiC/316L复合涂层组织得到明显细化,且SiC颗粒均匀分布。

英文摘要：

By combining ultrasonic vibration thermal effects conversion with dynamic boundary conditions imposed,the ultrasonic vibration boundary conditions were made approximation.The residual stress of SiC/316 Lcomposite coating with ultrasonic vibration in laser cladding was investigated,and the influence of ultrasonic amplitude and scanning speed on residual stress of composite coating was studied.According to the optimization results,SiC/316 L composite coating was prepared by ultrasonic aided laser cladding.The results show that ultrasonic amplitude and scanning speed have significant effects on x-stress,y-stress,shear stress at the interface and von Mises stress on the coating surface.The residual stress relaxation of SiC/316 Lcomposite coating is excellent when the ultrasonic amplitude is 10μm and scanning speed is 10mm/s.The structure of coating is obvious refinement,and SiC particles is uniform distributed for the ultrasonic cavitation or mechanical effect and acoustic streaming effect.