| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Elucidating Microstructural Evolution Under Extreme Environments
|
| Presentation Title |
Evolution of Dislocation Structure and Defects in Additively Manufactured 316 Stainless Steels Under Ion Irradiation – A Cluster Dynamics Study |
| Author(s) |
Sanjoy Kumar Mazumder, Wei-Ying Chen, Mathew Swisher, Stephen Taller, Andrea Jokisaari |
| On-Site Speaker (Planned) |
Sanjoy Kumar Mazumder |
| Abstract Scope |
A mean-field cluster dynamics (CD) framework for the evolution of ion-irradiated additively manufactured (AM) 316 stainless steel microstructure is presented with a focus on dislocation cells and voids. Such steels are potential structural materials for modern fast reactors. TEM analysis of AM316, irradiated with 4 MeV Ni ions to 10 dpa at 300 and 600°C, showed the cellular microstructure evolves into network dislocations, with both nucleation and growth of a spatially heterogenous void population at the former cell walls. The CD framework couples the evolution of irradiation defects, i.e., point defects, small clusters, dislocation loops and voids, with concurrent annihilation of cell walls by a dislocation climb-glide mechanism. Interaction of irradiation-induced dislocation loops with cell walls and network dislocations are also considered. Preliminary results show a steady decline in the dislocation density at cell walls, up to 1 dpa. Also, the preferential distribution of voids near cell walls are predicted. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Nuclear Materials, Additive Manufacturing |