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

Abstract

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.

Authors:
 [1];  [2];  [1]
  1. Univ. of Wisconsin, Madison, WI (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1614778
Report Number(s):
SAND-2020-3761J
Journal ID: ISSN 1073-5623; 685137
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
Additional Journal Information:
Journal Volume: 51; Journal Issue: 5; Journal ID: ISSN 1073-5623
Publisher:
ASM International
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Brittan, Andrew, Mahaffey, Jacob, and Anderson, Mark. Corrosion and Mechanical Performance of Grade 92 Ferritic-Martensitic Steel After Exposure to Supercritical Carbon Dioxide. United States: N. p., 2020. Web. https://doi.org/10.1007/s11661-020-05691-7.
Brittan, Andrew, Mahaffey, Jacob, & Anderson, Mark. Corrosion and Mechanical Performance of Grade 92 Ferritic-Martensitic Steel After Exposure to Supercritical Carbon Dioxide. United States. https://doi.org/10.1007/s11661-020-05691-7
Brittan, Andrew, Mahaffey, Jacob, and Anderson, Mark. Tue . "Corrosion and Mechanical Performance of Grade 92 Ferritic-Martensitic Steel After Exposure to Supercritical Carbon Dioxide". United States. https://doi.org/10.1007/s11661-020-05691-7. https://www.osti.gov/servlets/purl/1614778.
@article{osti_1614778,
title = {Corrosion and Mechanical Performance of Grade 92 Ferritic-Martensitic Steel After Exposure to Supercritical Carbon Dioxide},
author = {Brittan, Andrew and Mahaffey, Jacob and Anderson, Mark},
abstractNote = {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.},
doi = {10.1007/s11661-020-05691-7},
journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
number = 5,
volume = 51,
place = {United States},
year = {2020},
month = {2}
}

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