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

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...

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Bibliographic Details
Published in:Additive manufacturing 2020-12, Vol.36, p.101467, Article 101467
Main Authors: Choi, Gwanghyo, Choi, Won Seok, Han, Jeongho, Choi, Pyuck-Pa
Format: Article
Language:English
Subjects:
Additive manufacturing
Anisotropy
Direct energy deposition
Powder blend
Ti-based alloys
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Summary: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.
ISSN:2214-8604
2214-7810
DOI:10.1016/j.addma.2020.101467