A finite element model of Laser Powder Bed Fusion (LPBF) process applied to metallic alloys at a mesoscopic scale is presented. This Level-Set model allows to follow melt pool evolution and track development during building. A volume heat source model is used for laser/powder interaction considering the material absorption coefficients, while a surface heat source is used to consider the high laser energy absorption by dense metal alloys. An energy solver is applied considering convection and conductivity evolution in the system. Shrinkage during consolidation from powder to dense material is modelled by a compressible Newtonian constitutive law. An automatic remeshing strategy is also used to provide a good compromise between accuracy and computing time. Different cases are investigated to demonstrate the influence of the vaporisation phenomena, of material properties and of laser scan strategy on bead morphology.

提出了以介观尺度应用于金属合金的激光粉末床熔合（LPBF）工艺的有限元模型。该级别集模型允许在构建过程中跟踪熔池的演变并跟踪其发展。考虑材料吸收系数，将体热源模型用于激光/粉末相互作用，而表面热源模型用于考虑致密金属合金对激光能量的高吸收。考虑系统中的对流和电导率演变，应用能量求解器。从粉末到致密材料的固结过程中的收缩率通过可压缩的牛顿本构定律进行建模。自动重定格策略还用于在准确性和计算时间之间提供良好的折衷。研究了不同的情况以证明汽化现象的影响，