Numerical modelling of keyhole formation in selective laser melting of Ti6Al4V

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In the selective laser melting process, the molten pool flow, particularly the keyhole phenomenon, plays an important role in the pore formation and then influences the mechanical properties. In this study, we develop a 3D numerical model to simulate the keyhole mode in SLM. The transient evolutions of the temperature field, fluid flow, molten pool geometry and energy absorption have all been reproduced. The simulated molten pool dimensions agree well with the experimental data, including the fluctuation. More thorough insights into the underlying physical mechanisms are achieved, including the correlation between the keyhole geometry and laser absorption, the influence of manufacturing parameters on the melting mode, and the fluid flow pattern under different melting modes. These understandings can provide guidance for the optimization of manufacturing process parameters to improve the product quality.
Publisher
ELSEVIER SCI LTD
Issue Date
2021-02
Language
English
Article Type
Article
Citation

JOURNAL OF MANUFACTURING PROCESSES, v.62, pp.646 - 654

ISSN
1526-6125
DOI
10.1016/j.jmapro.2021.01.005
URI
http://hdl.handle.net/10203/281480
Appears in Collection
ME-Journal Papers(저널논문)
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