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Title: 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.

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
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}
}

Journal Article:
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Cited by: 1 work
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Figures / Tables:

Figure-1 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 » MPa IG sCO2 for four other Ni-based alloys are shown.« less

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Works referenced in this record:

Carburization of Fe-Cr Alloys During Oxidation in Dry Carbon Dioxide
journal, January 1967

  • Fujii, C. T.; Meussner, R. A.
  • Journal of The Electrochemical Society, Vol. 114, Issue 5
  • DOI: 10.1149/1.2426622

The role of metal nanoparticles and nanonetworks in alloy degradation
journal, July 2008

  • Zeng, Z.; Natesan, K.; Cai, Z.
  • Nature Materials, Vol. 7, Issue 8
  • DOI: 10.1038/nmat2227

Effect of pressure on supercritical CO 2 compatibility of structural alloys at 750 °C : Effect of pressure on supercritical CO
journal, April 2016

  • Pint, B. A.; Brese, R. G.; Keiser, J. R.
  • Materials and Corrosion, Vol. 68, Issue 2
  • DOI: 10.1002/maco.201508783

Oxidation and carburizing of FBR structural materials in carbon dioxide
journal, July 2015


Characterization of chromia scales formed in supercritical carbon dioxide
journal, October 2017


Initial Assessment of Ni-Base Alloy Performance in 0.1 MPa and Supercritical CO2
journal, September 2015


Water Vapor Effects on the Oxidation Behavior of Fe–Cr and Ni–Cr Alloys in Atmospheres Relevant to Oxy-fuel Combustion
journal, May 2012


Benchmarking supercritical carbon dioxide cycles against steam Rankine cycles for Concentrated Solar Power
journal, March 2015


Limiting Factors for Fe-Cr-Al and NiCr in Controlled Industrial Atrmospheres
journal, October 1997


U.S. Program on Materials Technology for Ultra-Supercritical Coal Power Plants
journal, June 2005

  • Viswanathan, R.; Henry, J. F.; Tanzosh, J.
  • Journal of Materials Engineering and Performance, Vol. 14, Issue 3
  • DOI: 10.1361/10599490524039

Factors in the oxidation assessment of AISI type 310 steels in high pressure carbon dioxide
journal, January 1982


Corrosion of iron-, nickel-, and cobalt-base alloys in atmospheres containing carbon and oxygen
journal, April 1982

  • Meier, G. H.; Coons, W. C.; Perkins, R. A.
  • Oxidation of Metals, Vol. 17, Issue 3-4
  • DOI: 10.1007/BF00738385

Differences in growth mechanisms of oxide scales formed on ODS and conventional wrought alloys
journal, August 1989

  • Quadakkers, W. J.; Holzbrecher, H.; Briefs, K. G.
  • Oxidation of Metals, Vol. 32, Issue 1-2
  • DOI: 10.1007/BF00665269

Corrosion of Alloy Haynes 230 in High Temperature Supercritical Carbon Dioxide with Oxygen Impurity Additions
journal, October 2016


A study on the solubility and distribution of carbon in oxides
journal, April 1985


The supercritical thermodynamic power cycle
journal, September 1968


A review of the oxidation behaviour of structural alloys in steam
journal, May 2010


Steam Oxidation Evaluation of Fe–Cr Alloys for Accident Tolerant Nuclear Fuel Cladding
journal, March 2017


High-Performance Supercritical Carbon Dioxide Cycle for Next-Generation Nuclear Reactors
journal, June 2006

  • Dostal, Vaclav; Hejzlar, Pavel; Driscoll, Michael J.
  • Nuclear Technology, Vol. 154, Issue 3
  • DOI: 10.13182/NT154-265

Effects of cerium and manganese on corrosion of Fe–Cr and Fe–Cr–Ni alloys in Ar–20CO2 gas at 818°C
journal, November 2013


Corrosion Behavior of Different Metallic Materials in Supercritical Carbon Dioxide at 550°C and 250 bars
journal, September 2011

  • Rouillard, F.; Charton, F.; Moine, G.
  • CORROSION, Vol. 67, Issue 9
  • DOI: 10.5006/1.3628683

Oxidation behaviour of cast Ni–Cr alloys in steam at 800°C
journal, July 2013


A Comparison of the Oxidation of Fe&?Cr, Ni?Cr and Co?Cr alloys in oxygen and water vapour
journal, November 1970

  • Wood, G. C.; Wright, I. G.; Hodgkiess, T.
  • Materials and Corrosion/Werkstoffe und Korrosion, Vol. 21, Issue 11
  • DOI: 10.1002/maco.19700211105

Supercritical CO2 Brayton cycles for solar-thermal energy
journal, November 2013


On the breakaway oxidation of Fe9Cr1Mo steel in high pressure CO2
journal, May 2017


Influence of chromium content on carburization of chromium-nickel-iron alloys in carbon dioxide
journal, May 1965


Alloys SS316 and Hastelloy-C276 in Supercritical CO2 at High Temperature
journal, September 2015


Type 304 Stainless Steel vs Flowing CO 2 At Atmospheric Pressure and 1100-1800F
journal, March 1965


Chromium-depleted zones and the oxidation process in stainless steels
journal, June 1976

  • Evans, H. E.; Hilton, D. A.; Holm, R. A.
  • Oxidation of Metals, Vol. 10, Issue 3
  • DOI: 10.1007/BF00612157

Penetration of protective chromia scales by carbon
journal, April 2014


    Works referencing / citing this record:

    Effect of pressure and impurities on oxidation in supercritical CO 2
    journal, April 2019

    • Pint, Bruce A.; Lehmusto, Juho; Lance, Michael J.
    • Materials and Corrosion, Vol. 70, Issue 8
    • DOI: 10.1002/maco.201810652

    Effect of Surface Finish on High-Temperature Oxidation of Steels in CO2, Supercritical CO2, and Air
    journal, October 2019

    • Oleksak, Richard P.; Holcomb, Gordon R.; Carney, Casey S.
    • Oxidation of Metals, Vol. 92, Issue 5-6
    • DOI: 10.1007/s11085-019-09938-6