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 |
Modeling premature breakaway oxidation of ferritic stainless steels above 850°C |
| Author(s) |
Anton Chyrkin, Jan Froitzheim |
| On-Site Speaker (Planned) |
Anton Chyrkin |
| Abstract Scope |
Ferritic stainless steels (FSS) comprise a family of materials based on the Fe-Cr system with the Cr content ranging from 12 to 24 wt. %, some grades reaching 30%. FSS find a wide application in the Solid Oxide Fuel Cells (SOFCs) or Electrolyser (SOEC) technology as interconnect material. The commercially available steel grades are designed to form a slow-growing, electrically conductive, protective Cr2O3 scale at 600-850 °C. Thin-walled components made of FSS such as foils, wires or metallic foams have a limited Cr reservoir and, hence, a chemical lifetime. Analytical and numeric models were proposed to predict time to breakaway oxidation. In the present work, the classical lifetime models were extended to account for the alpha-to-gamma transformation occurring in the Fe-Cr system above 850 °C. The novel model is validated by case-studies involving commercial ferritic steels Crofer 22 APU and Crofer 22 H. |