Investigation of atypical molten pool dynamics in tungsten carbide-cobalt during laser deposition using in-situ thermal imaging

An atypical "swirling" phenomenon observed during the laser deposition of tungsten carbide-cobalt cermets by laser engineered net shaping (LENS ® ) was studied using in-situ high-speed thermal imaging. To provide fundamental insight into this phenomenon, the thermal behavior of pure cobalt...

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Bibliographic Details
Published in:Applied physics letters 2012-01, Vol.100 (3), p.034101-034101-4
Main Authors: Xiong, Yuhong, Hofmeister, William H., Smugeresky, John E., Delplanque, Jean-Pierre, Schoenung, Julie M.
Format: Article
Language:English
Subjects:
CERMETS
COBALT
COMPARATIVE EVALUATIONS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CONVECTION
EMISSIVITY
ENERGY BEAM DEPOSITION
MATERIALS SCIENCE
POWDERS
SPECIFIC HEAT
SURFACES
THERMAL CONDUCTIVITY
TUNGSTEN CARBIDES
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Summary:An atypical "swirling" phenomenon observed during the laser deposition of tungsten carbide-cobalt cermets by laser engineered net shaping (LENS ® ) was studied using in-situ high-speed thermal imaging. To provide fundamental insight into this phenomenon, the thermal behavior of pure cobalt during LENS was also investigated for comparison. Several factors were considered as the possible source of the observed differences. Of those, phase difference, material emissivity, momentum transfer, and free surface disruption from the powder jets, and, to a lesser extent, Marangoni convection were identified as the relevant mechanisms.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3676420