Formation processes for large ejecta and interactions with melt pool formation in powder bed fusion additive manufacturing View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2019-12

AUTHORS

Abdalla R. Nassar, Molly A. Gundermann, Edward W. Reutzel, Paul Guerrier, Michael H. Krane, Matthew J. Weldon

ABSTRACT

Ejecta with a size much larger than the mean particle size of feedstock powder have been observed in powder bed fusion additive manufacturing, both during post-process sieving and embedded within built components. However, their origin has not been adequately explained. Here, we test a hypothesis on the origin of large (much larger than the mass-median-diameter of feedstock powder) ejecta-that, in part, they result from stochastic, inelastic collisions of ejecta and coalescence of partially-sintered agglomerates. The hypothesis is tested using direct observation of ejecta behavior, via high-speed imaging, to identify interactions between ejecta and consequences on melt pool formation. We show that stochastic collisions occur both between particles which are nearly-simultaneously expelled from the laser interaction zone and between particles ejected from distant locations. Ejecta are also shown to perturb melt pool geometry, which is argued to be a potential cause of lack-of-fusion flaws. More... »

PAGES

5038

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41598-019-41415-7

DOI

http://dx.doi.org/10.1038/s41598-019-41415-7

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1112969582

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30911016


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