Spattering and denudation in laser powder bed fusion process: Multiphase flow modelling
By Hui Chen, Wentao Yan. 2020
174 citations recorded by the source corpus.
Abstract To understand the physical mechanisms of the spattering and denudation phenomena in the laser powder bed fusion process, we develop a multiphase flow model by bi-directionally coupling the discrete element method and finite volume method, where the exchanges of both momentum and energy between the powder particles and gases are incorporated. It is the first time that the dynamic behaviours of both the gas phase and powder particles during the spattering and denudation phenomena are reproduced in computational modelling, which agree well with the published experimental observation. The metal vapour spouts out and decelerates sharply along the jetting direction while expanding radially, which induces remarkable vortex flows of the ambient gas. With comparative simulation cases, the vapour jetting and the consequent vortex flow are demonstrated to be dominant in the spattering and denudation phenomena, and the thermal buoyancy effect is proved to be negligible. Moreover, the influence of the jetting angle is investigated: no remarkable effect within the range of 60° - 120°; while larger than 150°, the accumulation zone is eliminated leading to a completely exposed denudation zone.
Subfields: Computational Mechanics, Mechanical Engineering, Ocean Engineering
View Paper: https://www.semanticscholar.org/paper/8513b7b70e750eb503cd8b0ab9ee894cf1380248
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In Computational Mechanics
In Mechanical Engineering
Citations in the corpus
- Material-structure-performance integrated laser-metal additive manufacturing (2021, background): “Spattering is a combined effect of the jetting vapor and attendant vortex flow of ambient gas, whereas denudation is driven by the vortex flow of ambient gas, where particles close to the vapor jet are entrained inward (145).”