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Laser powder bed fusion in high-pressure atmospheres.

Authors :
Bidare, P.
Bitharas, I.
Ward, R. M.
Attallah, M. M.
Moore, A. J.
Source :
International Journal of Advanced Manufacturing Technology. Oct2018, Vol. 99 Issue 1-4, p543-555. 13p.
Publication Year :
2018

Abstract

High-speed imaging and schlieren imaging were used to investigate the interaction of the laser beam with the powder bed at pressures up to 5 bar, in argon and helium atmospheres. The entrainment of powder particles in the flow of shielding gas generated by the laser plume, and hence denudation, was reduced at high pressure for both gases. However, for argon, high pressure increased the temperature of both the melt pool and the laser plume, which significantly increased the generation of spatter and ionisation of the metal vapour with degraded surface smoothness and continuity. For helium, the formation of spatter and plasma did not increase with the increase in pressure above that observed at atmospheric pressure: its higher thermal conductivity and thermal diffusivity limited the laser plume temperature. Layers built at 5 bar in helium had a surface smoothness and continuity comparable to those built in argon at atmospheric pressure, but achieved at a higher laser scan speed, suggesting that a high-pressure helium atmosphere may be used to enhance the build rate. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
02683768
Volume :
99
Issue :
1-4
Database :
Academic Search Index
Journal :
International Journal of Advanced Manufacturing Technology
Publication Type :
Academic Journal
Accession number :
133898488
Full Text :
https://doi.org/10.1007/s00170-018-2495-7