| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Refractory Metallic Materials
|
| Presentation Title |
Design and Development of a Reduced Cost, Hf-Free Nb-Based Alloy for Additive Manufacturing Guided by CALPHAD |
| Author(s) |
Andrew O'Connor, Fernando L. Reyes Tirado, Carly Romnes |
| On-Site Speaker (Planned) |
Andrew O'Connor |
| Abstract Scope |
Given the high-cost of C103 and limited used in nuclear applications due to Hf content an alternative alloy is investigated. Ta, W, and Mo were chosen as Hf replacements based upon literature, reduced cost compared to Hf, and minimal neutron absorption. Solid solution yield strength at elevated temperature, solidification cracking susceptibility (using Kou’s criterion), and mass density were predicted using Thermo-Calc®. Ductilizing additions of Ti and Zr were based on expert knowledge. Multi-objective optimization based on the CALPHAD results and a cost metric was used to identify the most compelling compositional spaces to explore in the Nb-Ta-W-Mo-Ti-Zr system. These compositions were arc melted, sectioned, homogenized and tested for hardness as a proxy for mechanical properties. This work has indicated a promising set of compositions for a reduced cost, Hf-free replacement alloy for C103. The most promising compositions were atomized via ultrasonic atomization and additive manufactures using laser powder bed fusion. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, ICME, Additive Manufacturing |