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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.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Corrosion Study of Stainless Steel 316 with Different Coatings in MgCl2-KCl Heat Transfer Fluid
Effect of Al Addition on Oxidation Behavior of a New Mo-Si-B Alloy
Elucidating Influence of Alloy Composition, Thermal Cycling and Environment on Oxidation Behavior of Engine Exhaust Valve Materials
Environmental Resistance and Microstructure Design in Mo-Si-B Alloys
Exploring Materials Options for sCO2 Applications: Steels to Cermets
Influence of the Water Vapor on Oxide Scale and Alpha Case Layer in Ti6Al4V
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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