期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 214, 期 11, 页码 2522-2528出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2014.05.002
关键词
Electron beam melting; Lattice-Boltzmann; Free surface; Layer connection defects; Porosity; Additive manufacturing
资金
- DFG [CRC814, SFB814]
During powder bed based additive manufacturing processes a component is fabricated by locally melting of powder layers with a laser or an electron beam. The fast melting process of the stochastic powder bed induces vigorous melt pool movements which sometimes lead to faults acting as starting points for larger defects such as channels bridging many layers. Since the formation of these defects cannot be understood in the framework of a homogenized numerical approach we have developed a mesoscopic numerical model based on the Lattice Boltzmann Method for the local melting process which considers individual powder particles. The model takes into account full hydrodynamics including capillary and wetting effects. It is shown that these effects coinbined with the stochastic powder layer are the origin of fault formation. The numerical results are compared with experiments in order to demonstrate the predictive value of our model. (C) 2014 Elsevier B.V. All rights reserved.
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