About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Developments in Advanced Nuclear Structural Materials
|
| Presentation Title |
Cellular Structure Evolution Comparison of LPBF and LDED 316H SS Following Ion Irradiation at Elevated Temperatures |
| Author(s) |
Ousmane Ndiaye, J F Stubbins |
| On-Site Speaker (Planned) |
Ousmane Ndiaye |
| Abstract Scope |
Stainless Steel (SS) 316H is a promising material for nuclear structural components due to its high-temperature strength, corrosion resistance, and fabricability. Compared to the AM 316L (low-carbon version), there is an insufficient amount of characterization for AM 316H, especially for radiation studies. This study compares Laser Powder Bed Fusion (LPBF) and Laser Direct Energy Deposition (LDED) AM 316H irradiated with 5 MeV Fe+2 ions at 400, 500, and 600 °C. Transmission Electron Microscopy (TEM) studied the cellular structure evolution, and Scanning Transmission Electron Microscopy with Energy Dispersive Spectroscopy (STEM/EDS) analyzed chemical segregation at cell boundaries. Results show LPBF produces finer cellular structures with higher dislocation densities due to rapid solidification rates, while LDED generates dendritic features and lower dislocation densities. LPBF has shown more segregation of Fe, Si, and Mo. The influence of irradiation temperature on microstructural stability and segregation behavior will be discussed to inform performance difference between printing methods. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Nuclear Materials, High-Temperature Materials |