About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Metals: Multiscale and Non-Equilibrium Solidification Fundamentals
|
| Presentation Title |
Solidification driven Hf segregation and concomitant dislocation cell formation during additive manufacturing of Nb-Hf-Ti alloys |
| Author(s) |
Advika Chesetti, Tirthesh Ingale, Sucharita Banerjee, Bhargav Sudhalkar, Vikram Chavan, Abhishek Sharma, Sudip Kumar Sarkar, Indradev Samajdar, Narendra B Dahotre, Rajarshi Banerjee |
| On-Site Speaker (Planned) |
Advika Chesetti |
| Abstract Scope |
Refractory metals are promising for high-temperature applications, and additive manufacturing (AM) provides new ways to process them. This study focuses on laser powder bed fusion (LPBF) of the Nb-based alloy C103 (Nb-10Hf-1Ti wt%). Multi-scale characterization of printed layers representing various thermal cycling stages reveals a cellular microstructure with Hf-enriched inter-cellular channels showing extensive dislocation activity. The results indicate dislocations agglomerate more at Hf- and O-enriched inter-cellular channels with increased thermal cycling and eventually form a dislocation cell-like network overlapping with the solidification cells. While the influence of such a dislocation structure on strengthening and deformation is extensively studied, there is very little understanding on the evolution of the dislocation cell structure in LPBF printed BCC alloys. Therefore, microstructural characterization is carried out on single and multi-tracks to understand the nature of the dislocations getting hindered at the Hf and O-rich inter-cellular channels because of thermal cycling. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Solidification, Characterization |