采用元胞自动机法和有限元法,将宏观温度场与微观晶粒生长相耦合,建立了激光熔注316L复合涂层晶粒生长模型,研究了非均匀温度场条件下复合涂层的晶粒生长,及增强相颗粒体积分数和颗粒尺寸对晶粒生长的影响。结果表明:激光熔注复合涂层晶粒大小分布随熔池深度方向变化而变化,熔池表面呈细小的等轴晶,熔池底部晶粒粗大;增强相颗粒体积分数含量越高,晶粒生长越慢,晶粒尺寸越小;增强相颗粒尺寸越小,晶粒生长的越慢,晶粒尺寸越小,组织越均匀。 By using the cellular automata method and the finite element method, the macroscopic temperature field is coupled with the microscopic grain growth. The grain growth model of the laser cladding 316L composite coating is established. The crystallization of the composite coating under non-uniform temperature field Particle growth, and enhance the phase particle volume fraction and particle size of the grain growth. The results show that the grain size distribution of the laser cladding composite coating changes with the depth direction of the molten pool. The surface of the molten pool is finely equiaxed and the grains at the bottom of the pool are coarse. The higher the volume fraction of the reinforcing phase particles, The slower the growth, the smaller the grain size; the smaller the grain size of the reinforcing phase, the slower the grain growth, the smaller the grain size and the more uniform the structure.