Investigation of atypical molten pool dynamics in tungsten carbide-cobalt during laser deposition using in-situ thermal imaging
- Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616 (United States)
- Center for Laser Applications, University of Tennessee Space Institute, Tullahoma, Tennessee 37388 (United States)
- Sandia National Laboratories, Livermore, California 94551 (United States)
- Department of Mechanical and Aerospace Engineering, University of California, Davis, California 95616 (United States)
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.
- OSTI ID:
- 22025412
- Journal Information:
- Applied Physics Letters, Vol. 100, Issue 3; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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