| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Refractory Metallic Materials
|
| Presentation Title |
Effects of Oxygen Concentration in Ductile to Brittle Transition Temperature (DBTT) of Niobium C103 Fabricated via Laser Direct Energy Deposition. |
| Author(s) |
Julio C. Ortega Rojas, Saket Thapliyal, Christopher Ledford, Brian Jordan, Michael Kirka |
| On-Site Speaker (Planned) |
Julio C. Ortega Rojas |
| Abstract Scope |
With current needs for higher temperature resistant materials, there is a growing interest in refractory alloys for high temperature applications where current generation Ni and Co-based superalloys have reached their maximum operational temperature (~1000 °C). Due to its high melting point (~2450 °C), good room temperature ductility, relatively low density (8.85 g/cc), and good high temperature strength compared to other refractory alloys, niobium C103 alloy is a promising material for ultra-high temperature applications. However, effects of oxygen content on the AM processability of niobium alloys remain unexplored. In this work, we investigate the effect of oxygen content in feedstock powder on the AM processability, microstructure evolution and mechanical behavior. Charpy-V notch specimens were fabricated via laser-directed energy deposition (L-DED) and tested at varying temperatures. Subsequent microstructure evolution is correlated with DBTT behavior. This work contributes to understanding the processing-structure-property correlation in additively manufactured Nb-based refractory alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Mechanical Properties |