期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 254, 期 -, 页码 72-78出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2017.11.032
关键词
Additive manufacturing; Selective laser melting; Discrete element method; Evaporation; Keyhole formation
资金
- Ministry of Science and Technology [MOST 106-2218-E-006-006-]
A three dimensional selective laser melting process simulation is developed to investigate the melt-pool behavior of a randomly-distributed powder bed with keyhole formation by Nd-YAG laser. In order to simulate a randomly packed powder bed, the discrete element method is introduced to ensure a close match with real conditions. Also, to show the importance of evaporation during laser melting, the melt pool temperature, melt pool dimensions and the surface morphology are used as metrics for comparison. Numerical results show that the keyhole was formed as evaporation occurred, and the shape of the melt pool was narrow and deep, which implied the main direction of heat transfer had changed to being vertical. Through simulation, the transition from keyhole formation to the final convex surface at a local area was discovered. The simulation results are validated via good agreement with the experiment.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据