The Effect of CO2 Pressure on Chromia Scale Microstructure at 750°C
Abstract
To understand and model performance in supercritical CO2 (sCO2) for high-efficiency, concentrating solar power (CSP) and fossil energy power cycles, reaction rates are compared at 750°C in 0.1 MPa CO2 and 30 MPa sCO2 as well as laboratory air as a baseline on structural materials such as Ni-based alloy 625. Due to the thin reaction products formed even after 5000 h, scanning transmission electron microscopy was used to study the Cr-rich surface oxide scale. The scales formed in CO2 and sCO2 had a much finer grain size with more voids observed in CO2. However, the observations on alloy 625 were complicated by Mo and Nb-rich precipitates in the adjacent substrate and Al internal oxidation. To simplify the system, a binary Ni-22Cr alloy was exposed for 1000 h in similar environments. After exposure in sCO2, there was an indication of carbon segregation detected on the Cr2O3 grain boundaries. After exposure in air, metallic Ni precipitates were observed in the scale that were not observed in the scale formed on alloy 625. The scale formed in air on a second Ni-22Cr model alloy with Mn and Si additions did not contain Ni precipitates, suggesting caution when drawing conclusions from model alloys.
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Fossil Energy (FE)
- OSTI Identifier:
- 1471923
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- JOM. Journal of the Minerals, Metals & Materials Society
- Additional Journal Information:
- Journal Volume: 70; Journal Issue: 8; Journal ID: ISSN 1047-4838
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Pint, B. A., and Unocic, K. A. The Effect of CO2 Pressure on Chromia Scale Microstructure at 750°C. United States: N. p., 2018.
Web. doi:10.1007/s11837-018-2963-4.
Pint, B. A., & Unocic, K. A. The Effect of CO2 Pressure on Chromia Scale Microstructure at 750°C. United States. doi:10.1007/s11837-018-2963-4.
Pint, B. A., and Unocic, K. A. Mon .
"The Effect of CO2 Pressure on Chromia Scale Microstructure at 750°C". United States. doi:10.1007/s11837-018-2963-4. https://www.osti.gov/servlets/purl/1471923.
@article{osti_1471923,
title = {The Effect of CO2 Pressure on Chromia Scale Microstructure at 750°C},
author = {Pint, B. A. and Unocic, K. A.},
abstractNote = {To understand and model performance in supercritical CO2 (sCO2) for high-efficiency, concentrating solar power (CSP) and fossil energy power cycles, reaction rates are compared at 750°C in 0.1 MPa CO2 and 30 MPa sCO2 as well as laboratory air as a baseline on structural materials such as Ni-based alloy 625. Due to the thin reaction products formed even after 5000 h, scanning transmission electron microscopy was used to study the Cr-rich surface oxide scale. The scales formed in CO2 and sCO2 had a much finer grain size with more voids observed in CO2. However, the observations on alloy 625 were complicated by Mo and Nb-rich precipitates in the adjacent substrate and Al internal oxidation. To simplify the system, a binary Ni-22Cr alloy was exposed for 1000 h in similar environments. After exposure in sCO2, there was an indication of carbon segregation detected on the Cr2O3 grain boundaries. After exposure in air, metallic Ni precipitates were observed in the scale that were not observed in the scale formed on alloy 625. The scale formed in air on a second Ni-22Cr model alloy with Mn and Si additions did not contain Ni precipitates, suggesting caution when drawing conclusions from model alloys.},
doi = {10.1007/s11837-018-2963-4},
journal = {JOM. Journal of the Minerals, Metals & Materials Society},
number = 8,
volume = 70,
place = {United States},
year = {2018},
month = {6}
}
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Figures / Tables:
Figure-1: Specimen mass gain at 750°C in 500-h cycles for alloy 625 in three different environments. The lines show median values for 6-10 specimens in each condition. The box and whiskers show the distribution of values at each measurement in 30 MPa IG sCO2. For comparison, median values in 30more »
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Works referencing / citing this record:
Effect of pressure and impurities on oxidation in supercritical CO 2
journal, April 2019
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- Materials and Corrosion, Vol. 70, Issue 8
Effect of Surface Finish on High-Temperature Oxidation of Steels in CO2, Supercritical CO2, and Air
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Figures / Tables found in this record:
Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.