About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques
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Presentation Title |
Multi-physics Modeling of Fluid and Powder Dynamics in Laser Powder Bed Fusion Process |
Author(s) |
Xuxiao Li, Wenda Tan, Cang Zhao, Niranjan Parab, Tao Sun |
On-Site Speaker (Planned) |
Xuxiao Li |
Abstract Scope |
In this work, a numerical model is established to simulate the thermo-fluidic dynamics of molten pool, metal vapor, and ambient gas as well as the powder particle motion in laser powder bed fusion (LPBF) process. The model features (a) level-set interface representation, (b) a unified framework to treat incompressible molten pool flow and compressible gas flow, and (c) a discrete element module to track particle motion. The simulations capture multiple key physical phenomena including keyhole and molten pool evolution, metal vapor expansion and ambient gas entrainment, and particle motion driven by gas flow and particle collision. The simulation results clearly reveal that the gas flow has significant effects on the powder motion, which, in turn, has significant effects on the keyhole and molten pool evolution. The results are consistent with the state-of-the-art high-speed X-ray imaging observations of the LPBF process. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |