| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Refractory Metallic Materials
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| Presentation Title |
Impact of Multi-Scale Microstructural Heterogeneities on the Mechanical Behavior of Additively Manufactured and Post-Processed Nb-Based C103 Alloy |
| Author(s) |
Advika Chesetti, Tirthesh Ingale, Sucharita Banerjee, Madhavan Radhakrishnan, Narendra B. Dahotre, Abhishek Sharma, Rajarshi Banerjee |
| On-Site Speaker (Planned) |
Advika Chesetti |
| Abstract Scope |
Laser powder-bed fusion (LPBF) processed Nb-based alloy C103 (Nb-10Hf-1Ti wt.%) develops a complex, hierarchical microstructure comprising a fine-scale solidification cell structure, overlaid with a dense dislocation-network outlining the cell boundaries, within the primary grains. Additionally, sub-grain boundaries and a fine-scale dispersion of nano-sized hafnium oxide precipitates, possibly forming during solidification, decorate the solidification cell boundaries as well as exist within the cells. While there are prior reports of similar microstructures in additively manufactured FCC-based alloys, to the best of our knowledge, this is the very first report in a BCC-based refractory alloy. This complex hierarchical microstructure results in impressive tensile mechanical properties. Post-build stress-relieving annealing and hot isostatic pressing (HIP) largely annihilates the solidification cell structure and associated dislocation network, lowering the strength but with substantial recovery of tensile ductility. Nevertheless, the resulting microstructure offers higher strengths as compared to their wrought counterparts. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Characterization |