| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Elucidating Microstructural Evolution Under Extreme Environments
|
| Presentation Title |
Influence of Pre-Deformation on Grain Boundary Oxidation of a Model Fe-Cr-Ni Alloy in High-Temperature Hydrogenated Water Environments |
| Author(s) |
Semanti Mukhopadhyay, Dallin J Barton, Tingkun Liu, Pauline G. Simonnin, Hyoju Park, Cheng-Han Li, Ziqing Zhai, Ferdinan Colon, Mychailo Toloczko, Arun Devaraj |
| On-Site Speaker (Planned) |
Semanti Mukhopadhyay |
| Abstract Scope |
The degradation of metallic alloys exposed to high-temperature hydrogenated water is controlled by intergranular stress corrosion cracking (IGSCC), often accelerated by selective oxidation along grain boundaries (GBs). Present work seeks to explore the effect of prior deformation on the oxidation behavior of GBs focusing on random GBs and coherent Σ=3 GBs. Using Scanning Transmission Electron Microscopy and Atom Probe Tomography, we investigated the microstructural evolution and intergranular oxidation in a model Fe-Cr-Ni alloy exposed to hydrogenated high temperature water after tensile deformation. The structure and composition of oxide layers, elemental partitioning including hydrogen segregation at the oxide-metal interfaces and GBs, and deformation-induced defects were characterized. Results from the advanced characterization experiments will be discussed and correlated with molecular dynamics simulations on diffusion induced grain boundary migration. Insights gained from present study are expected to support development of robust alloys to mitigate IGSCC in nuclear and hydrogen energy applications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Iron and Steel, Environmental Effects |