Experimental and computational thermal analysis of Ti-based alloy produced by laser metal deposition technique.
Kanyane, Rudolf L. Malatji, Nicholus Poopola, Patricia A. Raji, Abiola S. Pityana, Sisa Shongwe, Brendon M. Tlotleng, Monnamme
Kanyane, Rudolf L.
Malatji, Nicholus
Poopola, Patricia A.
Raji, Abiola S.
Pityana, Sisa
Shongwe, Brendon M.
Tlotleng, Monnamme
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Abstract
A Ti-Fe-Si-Cr-Nb alloy was fabricated using laser metal deposition (LMD) technique. The laser power and scanning speed were varied during fabrication to optimize the processing parameters. The thermal behavior during LMD processing was modeled and simulated by means of COMSOL Multiphysics 6.0 software. The samples produced were characterized using an optical microscope, X-ray diffractometer, and scanning electron microscope coupled with energy dispersive spectroscopy. The microhardness and wear behavior of the alloy were tested using a diamond indenter and ball-on-disk wear machine. The results obtained showed that the alloys exhibited similar dendritic microstructure for all processing parameters. The formation of cracks and pores were evident mainly in samples that were produced at high scanning speed and low laser power. A decrease in microhardness was noticed when the laser power was increased, while an increase in scanning speed yielded samples with high microhardness values. The alloy showed good tribological behavior, but no clear relationship between the wear resistance of the alloy and the variation of the laser processing parameters could be established.
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Date
2024-02-02
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Springer and Minerals, Metals and Materials Society (TMS)
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Keywords
Computational thermal analysis, Ti-based alloy, Laser metal deposition