Corrosion and Mechanical Performance of Grade 92 Ferritic-Martensitic Steel After Exposure to Supercritical Carbon Dioxide

Journal Article · 25 February 2020 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI: https://doi.org/10.1007/s11661-020-05691-7 · OSTI ID:1614778

Brittan, Andrew ^[1]; Mahaffey, Jacob ^[2]; Anderson, Mark ^[1]

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1. Univ. of Wisconsin, Madison, WI (United States)
2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Grade 92 ferritic-martensitic steel is a candidate alloy for medium temperature (< 550 °C) components for the supercritical carbon dioxide (s-CO₂) Brayton cycle. 1000 hours exposures were performed on base and welded material in s-CO₂ at temperatures of 450 °C or 550 °C and compared to samples aged in Ar at 550 °C. Both s-CO₂ exposures resulted in a duplex oxide growth and carburization, with 450 °C exhibiting carburization in a power law diffusion profile up to a depth of 200-250 µm, while 550 °C showed a linear profile up to a depth of 100 µm. The different profiles indicate much slower precipitation and coarsening of carbides at the lower temperature, allowing carbon to diffuse deeper into the material. However, 450 °C produced improved mechanical properties while 550 °C produced deteriorated properties. This was due to the higher density of carbon near the metal–oxide interface which leads to significant carbide coarsening and, subsequently, crack initiation and early failure. Finally, additional exposure at 450 °C is predicted to increase deposited carbon, but further study would be needed to understand if and when carburization will produce a negative mechanical effect.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: AC04-94AL85000; NA0003525
• OSTI ID: 1614778
• Report Number(s): SAND-2020-3761J; 685137
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 51, Issue 5; ISSN 1073-5623
• Publisher: ASM InternationalCopyright Statement
• Country of Publication: United States
• Language: English