Effect of Laser-Matter Interaction on Molten Pool Flow and Keyhole Dynamics
Effect of Laser-Matter Interaction on Molten Pool Flow and Keyhole Dynamics
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DOI：
10.1103/physrevapplied.11.064054
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发表时间：
2019-06-24
影响因子：
4.6
通讯作者：
Tan, Wenda
中科院分区：
文献类型：
--
作者：
Kouraytem, Nadia;Li, Xuxiao;Tan, Wenda
激光诱导小孔在添加剂制造和焊接过程中发生，但对小孔的动力学还没有很好的了解。多相多物理数值模型被用来预测实验观测中记录的小孔形状，以及预测过程中激光吸收、温度和流速的瞬时和非均匀分布。与最先进的动态X射线照相技术的数据进行比较，发现小孔形状和气液界面的起伏很好地符合，从而验证了模拟方法。然后详细讨论了激光吸收对小孔前壁和后壁动态行为的影响。定量比较了不同驱动力对小孔动力学的影响，评价了它们对小孔动力学的影响。
Laser-induced keyholing occurs in additive manufacturing and welding processes, but the keyhole dynamics have not been well understood. A multiphase and multiphysics numerical model is used to predict the keyhole shapes recorded in the experimental observations and to predict transient and nonuniform distributions of laser absorption, temperature, and flow velocity in the process. When compared against data from a state-of-the-art dynamic x-ray radiography technique, good agreement is found for the keyhole shapes and fluctuation of the gas-liquid interface, thereby validating the simulation method. A detailed discussion is then given to elucidate the effects of laser absorption on the dynamic behavior of the front and rear keyhole walls. A quantitative comparison of different driving forces on the keyhole is also given to evaluate their significance to the keyhole dynamics.