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Meeting Materials Science & Technology 2020
Symposium High Temperature Corrosion and Degradation of Structural Materials
Presentation Title Long-term Oxidation Behavior of Chromia-forming Alloys in High-temperature CO2 and Air
Author(s) Richard P. Oleksak, Casey S. Carney, Gordon R. Holcomb, Omer N. Dogan
On-Site Speaker (Planned) Richard P. Oleksak
Abstract Scope Future power systems require structural alloys that can survive long-term (>20 years) exposure to high-temperature CO2. Most studies have focused on relatively short exposures, and while this has improved mechanistic understanding of alloy oxidation in CO2, concerns remain for extrapolating short-term results to enable realistic lifetime predictions. In this work, several chromia-forming steels and Ni-based alloys were exposed in 500 h cycles to high purity CO2 at 700 C and 1 atm for up to 10,000 h. For comparison, the alloys were also exposed to laboratory air at the same conditions. The exposed samples were characterized using a variety of techniques to assess for extent of oxidation and carburization. Most alloys performed well in pure CO2, forming thin, well-adhered chromia scales throughout the duration of the exposure. Surprisingly, the alloys that formed and maintained chromia scales showed no signs of carburization even after 10,000 h.


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Exploring Materials Options for sCO2 Applications: Steels to Cermets
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Introductory Comments: High-temperature Corrosion and Degradation of Structural Materials
Kinetic Modeling of High-temperature Oxidation of Pure Metals by Incorporating Wagner’s Theory into the CALPHAD Approach
Long-term Oxidation Behavior of Chromia-forming Alloys in High-temperature CO2 and Air
Machine Learning and Data Analytics for Accelerating High-temperature, Corrosion-resistant Materials Design
Metal Dusting of Ni-based Alloys at Elevated Pressure in Different Gas Compositions
The Effect of Surface Treatment on the Formation, Structure, and Chemistry of Protective Oxide Scale on High-temperature Oxidation-resistant Nickel Alloys
Thermochemical Stability of EBC Silicates in High-temperature High-velocity Water Vapor

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