Modeling and numerical studies of selective laser melting: Multiphase flow, solidification and heat transfer
Modeling and numerical studies of selective laser melting: Multiphase flow, solidification and heat transfer
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选择性激光熔化的建模和数值研究：多相流、凝固和传热
DOI：
10.1016/j.matdes.2020.109115
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发表时间：
2020-11-01
影响因子：
8.4
通讯作者：
Lin, Shengxiang
中科院分区：
文献类型：
--
作者：
He, Qiyang;Xia, Huanxiong;Lin, Shengxiang
建立了一个考虑流体流动、液化和传热的多相多物理场选区激光熔化模型。离散元法和流体体积法分别用于生成粉末床和捕获熔体的自由表面。被认为是物理行为，如表面张力，Marangoni效应，蒸汽反冲，和辐射。提出了一种允许热源自适应地跟随熔池自由液面沿着运动且无功率泄漏的策略。发现并分析了熔池和凝固轨迹的基本特征。预测了水平和垂直两个相邻轨迹之间的重熔区，研究了扫描间距和激光功率对重熔区宽度和深度的影响。结果表明，熔池和重熔区的尺寸与工艺参数各向异性相关，改变激光能量输入可以改变熔池的动态状态，当采用大扫描间距时，相邻轨迹之间会出现气孔缺陷。(c)2020作者（S）爱思唯尔有限公司出版
A multiphase and multi-physics model is developed for the selective laser melting process, where fluid flow, lidification, and heat transfer are included. The discrete-element and volume-of-fluid methods are applied generate the powder bed and capture the free surface of the melts, respectively. Physical behaviors like surface tension, Marangoni effect, vapor recoil, and radiation are considered. A strategy that the heat source is allowed adaptively following the free surface of a molten pool along with power leakage-free is developed for the moving laser. The fundamental characteristics of the molten pool and solidified tracks are found and analyzed. The remolten region between two neighboring tracks in the horizontal and vertical directions is predicted, and effects of the scanning spacing and laser power on the width and depth of the remolten region are investigated. The results indicate that both the dimensions of the molten pool and remolten region depend on the process rameters anisotropically, varying the laser energy input could change the dynamic regime of a molten pool, and the pore defect can appear between adjacent tracks when using a large scanning spacing. (c) 2020 The Author(s). Published by Elsevier Ltd.