【摘要】 为了确定激光3D打印镍基合金的最优熔覆工艺参数，研究其制备过程中的温度场和应力场.基于ANSYS(采用高斯移动热源),对镍基合金粉末过程进行数值模拟仿真，并对不同激光输出功率下激光制备镍基自熔性合金涂层的温度场(瞬间温度)和应力场进行分析.结果表明，高斯激光中心区域的温度和复合涂层的残余应力都随激光功率的增加而增大，且残余应力是导致激光涂层产生裂纹的主要原因.可以通过调整激光功率到合适的数值来降低热影响区，并制约裂纹、孔洞等缺陷的产生.更多还原

【Abstract】 In order to determine the optimal cladding process parameters of laser 3D printing nickel-based alloy, the temperature field and stress field during the preparation process were studied. Based on ANSYS(using Gaussian moving heat source),this paper intends to simulate the process of nickel-based alloy powder, and analyze the temperature field(instantaneous temperature) and stress field of nickel-based self-fluxing alloy coating prepared by laser under different laser output power. The results show that the temperature of the central area of the Gaussian laser and the residual stress in the composite coating increase with the increase of the output laser power, and the residual stress is the cause of the crack in the cladding material. The heat affected zone can be reduced by adjusting the output laser power to a suitable value, and the defects such as cracks and holes can be restricted.更多还原