Additive manufacturing of titanium-base alloys with equiaxed microstructures using powder blends

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The microstructures and tensile properties of additively manufactured Ti-base alloys were investigated. Ti-6Al-4V and Co-Cr-Mo alloy powders were blended and used for directed energy deposition of bulk samples containing 5 and 10 wt.% Co. The Ti-6Al-4V and 5 wt.% Co samples exhibited an α phase at β grain boundaries, which caused a significant reduction and anisotropy of the tensile ductility. A single-phase β microstructure exhibiting equiaxed grains with a grain size of 36 μm, random texture, and isotropic tensile properties was obtained for the as-deposited 10 wt.% Co sample. These phenomena could be ascribed to the high Co content and the resulting enhanced stability of the β phase and the constitutional supercooling of the melt-pool.
Publisher
ELSEVIER
Issue Date
2020-12
Language
English
Article Type
Article
Citation

ADDITIVE MANUFACTURING, v.36, pp.101467

ISSN
2214-860
DOI
10.1016/j.addma.2020.101467
URI
http://hdl.handle.net/10203/276678
Appears in Collection
MS-Journal Papers(저널논문)
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