We developed a combined finite element and CALPHAD based model of the Laser Powder Bed Fusion (LPBF) process for AA7075 alloy that considers the effect of feedstock composition and print parameters. A single-pass of a laser on a layer of AA7075 alloy powder has been considered. Sensitivity of temperature evolution and melt pool geometry to variation in the stoichiometry of the feedstock powder and laser source characteristics have been studied. Our results indicate that deviation (up to 10%) of the feedstock composition from the AA7075 raises the maximum temperature and increases melt pool size. Excess Cu content shows the largest melt pool width and depth among all the cases. The peak temperature is higher than the standard feedstock composition in all cases, except when the Cu concentration is reduced. Increasing the scan power also results in a higher peak temperature and a larger melt pool size. Furthermore, the temperature's rise time increases by lowering the scan speed.

我们为 AA7075 合金开发了一种基于有限元和 CALPHAD 的激光粉末床融合 (LPBF) 工艺组合模型，该模型考虑了原料成分和打印参数的影响。已经考虑过激光在 AA7075 合金粉末层上的单程。已经研究了温度演变和熔池几何形状对原料粉末和激光源特性的化学计量变化的敏感性。我们的结果表明，原料成分与 AA7075 的偏差（高达 10%）会提高最高温度并增加熔池尺寸。在所有情况中，过量的铜含量显示出最大的熔池宽度和深度。在所有情况下，峰值温度都高于标准原料组成，除非 Cu 浓度降低。增加扫描功率还会导致更高的峰值温度和更大的熔池尺寸。此外，降低扫描速度会增加温度的上升时间。