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Meeting Materials Science & Technology 2020
Symposium High Temperature Corrosion and Degradation of Structural Materials
Presentation Title Exploring Materials Options for sCO2 Applications: Steels to Cermets
Author(s) Bruce A. Pint, Rishi Pillai, James R. Keiser
On-Site Speaker (Planned) Bruce A. Pint
Abstract Scope Supercritical CO2 (sCO2) is being explored for a wide range of applications from fossil to solar energy. Recent work showed that Ni-based alloys and advanced austenitic steels are compatible with sCO2 at 750C for 10 kh. For sCO2 cycles to be cost competitive, conventional steels are needed at 450-650C. Post-exposure room-temperature ductility is being used as a metric for evaluating compatibility of 9-12%Cr steels and type 316 stainless steels at these temperatures. Recent efforts also have explored revolutionary cycles at up to 1200C. Subcritical exposures at 1 and 20 bar CO2 found most materials except CVD SiC were rapidly attacked at 1200C including FeCrAl. NiCrAl-type alloys and other SiO2-forming materials, MoSi2 and MoSiAl, were explored at 1000C but reaction rates were higher than expected. Traditional cermet matrix candidates, Mo and W, were rapidly attacked under these conditions. Research sponsored by the US DOE, Office of Fossil Energy, Crosscutting Research Program

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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