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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。
By applying the combination of dynamic boundary conditions and ultrasonic vibrational thermal effect transformation, the ultrasonic vibration boundary conditions are approximated. The residual stress of laser cladding SiC / 316L composite coating under ultrasound is studied. The effect of ultrasonic amplitude and scanning speed on the composite coating Layer residual stress. The SiC / 316L composite coatings were prepared by ultrasonic assisted laser cladding according to the optimization results. The results show that the ultrasonic amplitude and scanning speed have significant effects on the x-direction stress, y-direction stress, interfacial shear stress and von Mises stress. The SiC / 316L composite coating has good residual stress relaxation effect when the ultrasonic amplitude is 10μm and the scanning speed is 10mm / s. Ultrasonic cavitation or mechanical effect and acoustic flow promote the microstructure of SiC / 316L composite coating to be obviously refined, and SiC particles are uniformly distributed.