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Details

Autor(en) / Beteiligte
Titel
In situ X-ray imaging of defect and molten pool dynamics in laser additive manufacturing
Ist Teil von
  • Nature communications, 2018-04, Vol.9 (1), p.1355-9, Article 1355
Ort / Verlag
England: Nature Publishing Group
Erscheinungsjahr
2018
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
  • The laser-matter interaction and solidification phenomena associated with laser additive manufacturing (LAM) remain unclear, slowing its process development and optimisation. Here, through in situ and operando high-speed synchrotron X-ray imaging, we reveal the underlying physical phenomena during the deposition of the first and second layer melt tracks. We show that the laser-induced gas/vapour jet promotes the formation of melt tracks and denuded zones via spattering (at a velocity of 1 m s ). We also uncover mechanisms of pore migration by Marangoni-driven flow (recirculating at a velocity of 0.4 m s ), pore dissolution and dispersion by laser re-melting. We develop a mechanism map for predicting the evolution of melt features, changes in melt track morphology from a continuous hemi-cylindrical track to disconnected beads with decreasing linear energy density and improved molten pool wetting with increasing laser power. Our results clarify aspects of the physics behind LAM, which are critical for its development.
Sprache
Englisch
Identifikatoren
ISSN: 2041-1723
eISSN: 2041-1723
DOI: 10.1038/s41467-018-03734-7
Titel-ID: cdi_doaj_primary_oai_doaj_org_article_9fdafac95ba34ae3b8efb256e556d473

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