About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
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Computational Thermodynamics and Kinetics
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Presentation Title |
Unraveling the Combined Impact of Stress and Hydrogen on Stress Corrosion Cracking of Fe-based Alloys: A Synergistic Experimental and Computational Study |
Author(s) |
Arun Devaraj, Semanti Mukhopadhyay, Venkata Bhuvaneswari Vukkum, Zehao Li, Tingkun Liu, Dallin Barton, Sten Lambeets, Maria Sushko, Prashant Singh, Matthew Olszta |
On-Site Speaker (Planned) |
Arun Devaraj |
Abstract Scope |
Simultaneous application of tensile stress and high-temperature corrosive water environment on stainless steels cause hydrogen and oxygen interactions, leading to intergranular stress corrosion cracking (SCC). Although predictive models for these combined effects are currently unavailable, we hypothesize that altering the grain boundary structure and chemistry of stainless steels can control hydrogen embrittlement and intergranular oxidation, thereby mitigating SCC mechanisms. To test this, we used cryogenic-transfer atom probe tomography, transmission electron microscopy, and in-situ synchrotron high-energy X-ray diffraction experiments. The experimental findings were correlated with Density Functional Theory and thermodynamic linear-response theory calculations of the phase stability and short-range ordering as well as Coupled Poisson–Nernst–Planck transport kinetics and classical density functional theory simulations for oxidation mechanisms of Fe-based alloys. These insights aim to guide predictive model development and steel microstructure design for enhanced SCC and hydrogen embrittlement resistance in nuclear applications. |
Proceedings Inclusion? |
Planned: |
Keywords |
Iron and Steel, Nuclear Materials, Environmental Effects |