About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Understanding and Mitigating High Temperature Corrosion Processes Through Synergistic Integration of Experimental, Computational and Manufacturing Techniques
|
| Presentation Title |
Impact of water vapor and hydrogen on oxidation behavior of chromia-forming Ni-based alloys |
| Author(s) |
Marie Romedenne, Yi-Feng Su, Ashok Vayyala, Jonathan Poplawsky, Rishi Pillai |
| On-Site Speaker (Planned) |
Marie Romedenne |
| Abstract Scope |
Water vapor and hydrogen are primary byproducts of various combustion engines and solid oxide fuel cells that pose corrosion challenges for the selection and development of suitable and cost-effective oxidation resistant materials. The impact of water vapor on oxidation lifetime of Ni-based chromia formers has been numerously demonstrated and was observed to accelerate the transition from protective oxidation behavior (e.g. Cr2O3 formation) to non-protective oxidation behavior (e.g., thick mixed oxides). The impact of hydrogen and water on Cr2O3 growth mechanisms has been less studied. In the present study, transmission electron microscopy and Atom Probe Tomography were used to investigate the Cr2O3 grain microstructure and grain boundary segregation formed on Ni-based model alloys with various Mn, Fe and Zr additions after exposure in water vapor and hydrogen containing atmospheres between 800 and 950 °C. |