About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
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Understanding and Mitigating High Temperature Corrosion Processes Through Synergistic Integration of Experimental, Computational and Manufacturing Techniques
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| Presentation Title |
Predicting Internal to External Oxidation in High-Temperature Ni-Cr Alloys Using a CALPHAD-Informed Phase-Field Model |
| Author(s) |
Ziming Zhong, Peichen Wu, Rishi Pillai, Kumar Ankit |
| On-Site Speaker (Planned) |
Ziming Zhong |
| Abstract Scope |
In Ni–Cr alloys, the critical shift from protective external oxide scales to detrimental internal precipitation hinges on a competition between oxygen diffusion and reactive phase formation. This transition governs whether corrosion damage remains localized at the surface or penetrates the inner regions of Ni-Cr microstructure. To reduce costs of exhaustive high-temperature testing, we present a CALPHAD-informed phase-field model with experimentally measured Gibbs free energy and atomic mobility. The framework not only reproduces classical 1-D Wagner kinetics but extends to 2-D simulations, resolving the dynamic competition between external scale growth and internal oxide precipitation across industrially relevant Cr concentrations at 1000 °C. By mapping the internal-to-external oxidation transition boundary, our calculations quantify critical thresholds in alloy composition and environmental conditions, while tracking scale thickness and precipitate evolution over time. This approach replaces laborious experimental matrices with rapid, tunable simulations, enabling predictive screening of oxidation-resistant alloys and coatings. |