About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Materials, Processes and Applications for Energy Industry
|
| Presentation Title |
Effect of Process Atmosphere on Microstructure and Mechanical Performance of Fe-12Cr-6Al Fabricated Via Laser Powder Bed Fusion |
| Author(s) |
Omer Cakmak, Hwasung Yeom, Jung-Wook Cho |
| On-Site Speaker (Planned) |
Omer Cakmak |
| Abstract Scope |
This study investigates the effect of processing atmospheres—argon (Ar) and nitrogen (N₂)—on Fe-12Cr-6Al alloys fabricated using Laser Powder Bed Fusion (L-PBF). Key aspects examined include melt pool morphology, microstructure, precipitate formation, and mechanical properties. Compared to Ar, the N₂ atmosphere led to reduced porosity, wider melt pools, and elimination of Al₂O₃ agglomerates. Chemical analysis showed oxygen content decreased from 0.012 wt.% to 0.0045 wt.%, while nitrogen content increased from 0.013 wt.% to 0.02 wt.%. These changes improved mechanical performance: The N₂-built sample achieved a yield strength of 315 ± 11 MPa, ultimate tensile strength of 401 ± 11 MPa, and total elongation of 7.8 ± 1.1%, compared to 232 ± 15 MPa, 286 ± 10 MPa, and 6.4 ± 1.3% for the Ar-built sample. The results suggest that N₂ is a promising, cost-effective alternative to Ar as a shielding gas for producing high-performance FeCrAl components via L-PBF. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Solidification, Nuclear Materials, Additive Manufacturing |