针对选区激光熔化单层316L, 采用ABAQUS软件, 利用DFLUX子程序编译移动双椭球热源并结合USDFLD子程序实现材料属性转变的方法数值模拟SLM过程, 考虑了材料由粉体转化为实体的热物性参数和相变潜热对SLM的影响, 分析了单层扫描过程中温度场的变化规律, 包括扫描轨道中点的温度变化、熔池存在时间以及熔池结构。研究结果发现, 随着扫描轨道逐渐增加, 扫描轨道中点的峰值温度、熔池存在时间及熔池结构在初始阶段增幅较大, 之后变得相对平缓并达到稳定状态。表明在SLM过程中, 随着扫描轨道增加, 扫描区域的温度场会逐渐处于动态稳定状态。

The process of selective laser melting single layer 316L is studied. The DFLUX subroutine to compile the moving double ellipsoid heat source and the USDFLD subroutine to change the material properties in ABAQUS software to numerically simulate SLM process. The influence of thermal physical properties parameters of material from the powder into the solid and the latent heat of phase change on SLM are considered. The temperature field variation during single layer scanning is analyzed, including the temperature change at the midpoint of the scanning track, the molten pool lifetime and the molten pool dimension. The results show that as the scanning track gradually increases, the peak temperature at the midpoint of the scanning track, the molten pool lifetime and the molten pool dimension increase greatly in the initial stage, and then become relatively flat and reach a stable state. Indicating that during the SLM process, with the scanning track increases, the temperature field of the scanning area will gradually be in a dynamic stable state.