为了分析超声冲击强化激光熔覆层工艺过程的应力场变化规律,建立了超声冲击强化镍基高温合金GH4169基材熔覆镍基高温合金粉末GH95熔覆层过程的仿真模型,使用Marc有限元分析软件分析了超声冲击强化过程中的应力场的变化,并进行了试验验证.结果表明:超声冲击后激光熔覆层残余应力显著减小,局部区域残余拉应力得到完全消除;超声冲击后熔覆层表层形成一定深度的压应力区域,熔覆层X方向形成最大压应力值为－263.9 MPa,残余应力消除率达126.98%.仿真结果为超声冲击激光熔覆层工艺试验提供了理论指导.

In order to analyze the variation of laser cladding layer stress field with UIT,a simulation model of strengthening process of the cladding layer with UIT is established by finite element method,and the layer is nickel-based superalloy GH4169 laser cladding with GH95 powder.The stress field of strengthening process with UIT has been analyzed by Marc software,and verification experimental was conducted.The results shows that the residual stress of strengthened laser cladding layer has significantly reduced,the partial residual tensile stress got completely eliminated.A depth of compressive stress cladding layer region has been formed.The maximum compressive stress formed was －263.9 MPa in X direction of cladding layer,resulting in the residual stress elimination rate of 126.98%.A theoretical guidance for the laser cladding process with UIT has been provided.