Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 214, Issue 11, Pages 2627-2636Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2014.06.001
Keywords
Additive manufacturing; Selective laser melting; Fluid dynamics; Heat transfer; First-principles simulation
Funding
- U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- Laboratory Directed Research and Development Program at LLNL [13-SI-002]
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A 3D mesoscopic model is developed to simulate selective laser melting processes using the ALE3D multiphysics code. We study the laser-induced melting of a random bed of stainless steel 316 particles on a solid substrate (1000 mu m x 300 mu m x 50 mu m) and its solidification into either a continuous track or a discontinuous track as a result of Plateau Rayleigh instability. Our approach couples thermal diffusion to hydrodynamics and accounts for temperature dependent material properties and surface tension, as well as the random particle distribution. The simulations give new physical insight that should prove useful for development of continuum models, where the powder is homogenized. We validate our approach against the experiment and find that we match the main laser track characteristics. Published by Elsevier B.V.
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