About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
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Symposium
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Elucidating Microstructural Evolution Under Extreme Environments
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Presentation Title |
Mesoscale Modeling of Dislocation Cell Structure Evolution and Radiation-Induced Segregation in Additively Manufactured Austenitic Stainless Steel |
Author(s) |
Sourabh Bhagwan Kadambi, Wei-Ying Chen, Andrea Jokisaari |
On-Site Speaker (Planned) |
Sourabh Bhagwan Kadambi |
Abstract Scope |
Structural alloys under irradiation develop radiation-induced segregation (RIS) at point defect sinks, which lead to undesired changes in the alloy's properties. Additively manufactured austenitic stainless steels are expected to yield a distinct response to irradiation damage owing to their unique as-printed dislocation cell structure. In this talk, we present the development of a mesoscale model for dislocation cell structure evolution coupled with RIS using the MOOSE framework. The evolution of network dislocations within spatially distinct cells and cell walls are modeled using climb-mediated edge annihilation and generation processes. Starting with initial microstructures of as-printed non-equilibrium segregations at dislocation cell walls, our 2D and 3D simulations explore the effects of irradiation temperature, dose rate, dislocation sink bias, and specimen thickness on microstructure evolution. The results will be compared against experimental characterizations of in-situ and ex-situ ion-irradiated samples, and the implications of evolving cell structure on irradiation damage response will be discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Additive Manufacturing, Nuclear Materials |