材料科学
融合
离散元法
钼
图层(电子)
激光器
计算流体力学
磁道(磁盘驱动器)
选择性激光熔化
维数(图论)
复合材料
机械
冶金
机械工程
微观结构
光学
哲学
语言学
物理
数学
纯数学
工程类
作者
Yuhang Wu,Qiong Wu,Meng Li,Ju Wang,Dengzhi Yao,Hao Luo,Xizhong An,Haitao Fu,Hao Zhang,Xiaohong Yang,Qingchuan Zou,Shujun Li,Haibin Ji,Xing Zhang
标识
DOI:10.1016/j.addma.2023.103783
摘要
In this article, three-dimensional discrete element method (DEM) and computational fluid dynamics (CFD) coupled numerical simulations were carried out to investigate the single/multi-track and multi-layer printing of Molybdenum (Mo) powder using laser powder bed fusion (LPBF) approach at meso-scale. In the whole process, the effects of powder spreading and selective melting in multi-layer fabricating were analyzed, through which a mathematical correlation was derived to quantify the final stable dimensions of the powder bed and the printed region. Results show that appropriate laser scanning velocity, laser power and adequate powder bed density are indispensable for a smooth and continuous molten track. The scanning hatch distance should not exceed the molten pool width. The application of a certain preheating temperature can improve the inter-track connectivity. During multi-layer melting, the established quantitative correlations in the steady state between the set gap height (HN), actual layer thickness (hA), molten layer thickness (hM) and fusion ratio (ρF) are hA=HN/ρF and hM=HN, respectively, which have been verified by the results through both physical experiments and numerical simulations. The results obtained have both theoretical significance and practical value in optimizing the process parameters for Mo material in LPBF.
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