期刊
POWDER TECHNOLOGY
卷 409, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.powtec.2022.117789
关键词
Powder recoating; Melt pool; Laser powder bed fusion; Particle scale modelling; Defects formation
资金
- Australian Research Council Industrial Transformation Research Hubs Scheme [IH140100035]
- Australian Government
This paper provides a review of the multi-physics problems involved in laser powder bed fusion (LPBF), including metal powder recoating, melting and solidification processes. The applications of discrete element method and computational fluid dynamics in studying these processes are discussed.
Particle scale modelling of the process physics involved in laser powder bed fusion (LPBF) is a recent research hotspot, and many efforts have been made in the literature. However, a comprehensive review of the physics in LPBF and the effects of key variables such as powder-and operation-related parameters, and the mechanisms of defects formation is still lacking. This paper aims to offer a state-of-the-art review on multi-physics related to metal powder recoating and further melting and solidification process. The studies on powder bed recoating explored by discrete element method are presented first, including model theory and validation, effects of process parameters, and physics of particle flow and size segregation. Then powder melting approach based on computational fluid dynamics and the involved phenomena such as melt pool dynamics, keyhole dynamics, defects formation mechanisms of pores, and balling and spattering are described. The needs for future research are also discussed.
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