激光功率与底面状态对选区激光熔化球化的影响

doi:10.7527/S1000-6893.2019.23089

Abstract

Abstract: This study proposes a Powder Spreading (PS) model and a Computational Fluid Dynamics (CFD) model to investigate the influence of laser power and surface condition on balling behavior for Selective Laser Melting (SLM). Metal powders are spread on a flat surface and an as-built surface. The simulated powder bed is then imported into a molten pool of the SLM-CFD model based on the finite volume method. The effect of laser power and substrate surface condition on the flow behavior of the molten pool and induced single track morphology are studied. To verify the PS and SLM-CFD models on both substrate surfaces, an SLM experiment is also conducted. The results show that the balling number decreases with the increase of laser power. Due to the poor wettability and disturbance in the molten pool induced by the as-built surface, the balling behavior on the as-built surface becomes more serious. The simulated results has a good agreement with experimental results. The study provides a theoretical guide to the selection of the processing parameters for SLM processes.

Key words: selective laser melting, balling behavior, discrete element method, computational fluid dynamics, melt pool flow

CLC Number:

V261.8

FENG Yiqi, XIE Guoyin, ZHANG Bi, QIAO Guowen, GAO Shang, BAI Qian. Influence of laser power and surface condition on balling behavior in selective laser melting[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019, 40(12): 423089-423089.

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Influence of laser power and surface condition on balling behavior in selective laser melting

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