About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
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Symposium
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Additive Manufacturing: Processing, Microstructure and Material Properties of Titanium-based Materials
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Presentation Title |
Laser Additive Manufacturing Under Reactive Atmosphere: An Approach to Fabricate Ultra-high Strength Commercially Pure Titanium Without Sacrificing Ductility |
Author(s) |
Dawei Wang, Yangping Dong, Ming Yan |
On-Site Speaker (Planned) |
Dawei Wang |
Abstract Scope |
This study presents a novel approach for the additive manufacturing (AM) of commercially pure Titanium (CP-Ti). Through introducing the Ar−N2 reactive atmosphere into the laser powder bed fusion (LPBF) processing, the approach confers superb strength to CP-Ti without sacrificing its ductility. A yield strength of 807 MPa combined with a 19.15% elongation-at-fracture has been achieved by incorporating solute atoms from the Ar−N2 atmosphere. The mechanical performance and microstructure of the as-printed CP-Ti have been systematically investigated. Transmission electron microscopy, electron backscatter diffraction, and atom probe tomography have been employed to reveal the in-situ reaction mechanism between CP-Ti and reactive Ar−N2 atmosphere. Results suggest that nitrogen is generally dissolved in the α′-Ti matrix as interstitial solute atoms. The beneficial N content has a critical limit of ~0.43 wt.%. We believe our work has important significance in advancing the applications of CP-Ti/Ti alloys as biomedical or structural materials. |