About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Cold Spray Additive Manufacturing: Part Quality and Performance
|
Presentation Title |
Cold Spray Additive Manufacturing of High Purity Tantalum and Niobium Rare Metals; Fabrication, Microstructure, Room and High Temperature Mechanical Properties |
Author(s) |
Kee-Ahn Lee, Young-Kyun Kim, Yu-Jin Whang |
On-Site Speaker (Planned) |
Kee-Ahn Lee |
Abstract Scope |
High purity Ta and Nb rare metals, the high melting point refractory ones, were fabricated by using cold spray additive manufacturing (CSAM) and the mechanical properties at various temperatures from room temperature to 950°C were investigated. Microstructural evolution was occurred in the process of accommodating harsher plastic deformation along the powder boundaries. Compression tests confirmed that room temperature yield strengths were ~901 MPa (Ta) and ~660 MPa (Nb), which is three to six times higher than pure rare metals produced using conventional processes. CS rare metals showed excellent mechanical properties even at high temperatures, and such properties were confirmed to be retained up to approximately 950°C. Dynamic recovery and recrystallization started to occur near 800°C, and the surface oxidation and microstructural evolution severely affected to the high temperature fracture behavior of rare metals. The relationship between the microstructure, mechanical properties, and fracture mechanism were also discussed in this study. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Characterization, Mechanical Properties |