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Transient dynamics and stability of keyhole at threshold in laser powder bed fusion regime investigated by finite element modeling

Article dans une revue avec comité de lecture
Author
MAYI, Yaasin A.
PEYRE, Patrice
BELLET, Michel
301492 Mines Paris - PSL (École nationale supérieure des mines de Paris)
METTON, Charlotte
505477 Safran Tech
MORICONI, Clara
505477 Safran Tech
FABBRO, Remy
ccDAL, Morgan
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

URI
http://hdl.handle.net/10985/19943
DOI
10.2351/7.0000330
Date
2021
Journal
Journal of Laser Applications

Abstract

A Finite element model is developed with a commercial code to investigate the keyhole dynamics and stability at keyhole threshold, a fusion regime characteristic to laser microwelding or to Laser Powder Bed Fusion. The model includes relevant physics to treat the hydrodynamic problems - surface tension, Marangoni stress, and recoil pressure - as well as a self-consistent ray-tracing algorithm to account for the "beam-trapping"effect. Implemented in both static and scanning laser configurations, the model successfully reproduces some key features that most recent x-ray images have exhibited. The dynamics of the liquid/gas interface is analyzed, in line with the distribution of the absorbed intensity as well as with the increase of the keyhole energy coupling. Based on these results, new elements are provided to discuss our current understanding of the keyhole formation and stability at threshold.

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