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Powder particle attachment mechanisms onto liquid material

 
: Volpp, Jörg; Prasad, H.S.; Riede, Mirko; Brückner, Frank; Kaplan, A.F.H.

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Fulltext ()

Procedia CIRP 74 (2018), pp.140-143
ISSN: 2212-8271
International Conference on Photonic Technologies <10, 2018, Fürth>
English
Journal Article, Conference Paper, Electronic Publication
Fraunhofer IWS ()
direct metal deposition; powder particle; high speed imaging; laser materials processing; additive manufacturing

Abstract
In order to achieve high powder and energy efficiencies of Direct Metal Deposition processes knowledge about the basic effects of the interaction of the particle on the liquid surface is mandatory. Characteristic zones on the melt pool surface were identified in high-speed images. In the melt pool area around the center of the laser beam illumination, particles immediately enter into the melt pool while in its vicinity the particles float on the melt pool until they incorporate. Closer to the solidification line, particles rest on the liquid surface and remain as surface roughness on the track after solidification.

: http://publica.fraunhofer.de/documents/N-524035.html