The effect of high-temperature microstructure degradation (thermal ageing) on the corrosion resistance of austenitic stainless steels in supercritical water (SCW) was evaluated in this study. Mill-annealed (MA) and thermally treated (TT) samples of Type 316L and Type 310S stainless steel were exposed in 25 MPa SCW at 550°C with 8 ppm dissolved oxygen in a flowing autoclave testing loop. The thermal treatments applied to Type 316L (815°C for 1000 hr + water quench) and Type 310S (800°C for 1000 hr + air cool) were successful in precipitating the expected intermetallic phases in each alloy, both within the grains and on the grain boundaries. It was found that a prolonged time at relatively high temperature was sufficient to suppress significant compositional variation across the various intermetallic phase boundaries. This paper presents the results of the gravimetric analysis and oxide scale characterization using scanning electron microscopy (SEM) coupled with X-ray energy-dispersive spectroscopy (EDS). The role played by the fine precipitate structure on formation of the oxide scale, and thus corrosion resistance, is discussed. The combined role of dissolved oxygen and flow (revealed by examining the differences between Type 316L samples exposed in a static autoclave and in the flowing autoclave loop) is also addressed. It was concluded that formation of intermetallic phase precipitates during high-temperature exposure is not likely to have a major effect on the apparent corrosion resistance because of the discontinuous nature of the precipitation.
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e-mail: Wenyue.Zheng@NRCan-RNCan.gc.ca
e-mail: David.Guzonas@cnl.ca
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January 2016
Research Papers
Effect of Thermal Pretreatment on the Corrosion of Stainless Steel in Flowing Supercritical Water
Yinan Jiao,
Yinan Jiao
Department of Materials Science and Engineering,
e-mail: jiaoyn@mcmaster.ca
McMaster University
, 1280 Main Street West, Hamilton, ON L8S 4L7
, Canada
e-mail: jiaoyn@mcmaster.ca
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Joseph R. Kish,
Joseph R. Kish
1
Department of Materials Science and Engineering,
e-mail: kishjr@mcmaster.ca
McMaster University
, 1280 Main Street West, Hamilton, ON L8S 4L7
, Canada
e-mail: kishjr@mcmaster.ca
1Corresponding author.
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Graham Steeves,
Graham Steeves
Department of Chemical Engineering,
e-mail: graham.steeves@unb.ca
University of New Brunswick
, 15 Dineen Drive, Fredericton, NB E3B 5A3
, Canada
e-mail: graham.steeves@unb.ca
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William G. Cook,
William G. Cook
Department of Chemical Engineering,
e-mail: wcook@unb.ca
University of New Brunswick
, 15 Dineen Drive, Fredericton, NB E3B 5A3
, Canada
e-mail: wcook@unb.ca
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Wenyue Zheng,
e-mail: Wenyue.Zheng@NRCan-RNCan.gc.ca
Wenyue Zheng
CanmetMATERIALS, Natural Resources Canada
, 183 Longwood Road South, Hamilton, ON L8P 0A5
, Canada
e-mail: Wenyue.Zheng@NRCan-RNCan.gc.ca
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David A. Guzonas
e-mail: David.Guzonas@cnl.ca
David A. Guzonas
Canadian Nuclear Laboratories, Chalk River Laboratories
, ON K0J 1J0
, Canada
e-mail: David.Guzonas@cnl.ca
Search for other works by this author on:
Yinan Jiao
Department of Materials Science and Engineering,
e-mail: jiaoyn@mcmaster.ca
McMaster University
, 1280 Main Street West, Hamilton, ON L8S 4L7
, Canada
e-mail: jiaoyn@mcmaster.ca
Joseph R. Kish
Department of Materials Science and Engineering,
e-mail: kishjr@mcmaster.ca
McMaster University
, 1280 Main Street West, Hamilton, ON L8S 4L7
, Canada
e-mail: kishjr@mcmaster.ca
Graham Steeves
Department of Chemical Engineering,
e-mail: graham.steeves@unb.ca
University of New Brunswick
, 15 Dineen Drive, Fredericton, NB E3B 5A3
, Canada
e-mail: graham.steeves@unb.ca
William G. Cook
Department of Chemical Engineering,
e-mail: wcook@unb.ca
University of New Brunswick
, 15 Dineen Drive, Fredericton, NB E3B 5A3
, Canada
e-mail: wcook@unb.ca
Wenyue Zheng
CanmetMATERIALS, Natural Resources Canada
, 183 Longwood Road South, Hamilton, ON L8P 0A5
, Canada
e-mail: Wenyue.Zheng@NRCan-RNCan.gc.ca
David A. Guzonas
Canadian Nuclear Laboratories, Chalk River Laboratories
, ON K0J 1J0
, Canada
e-mail: David.Guzonas@cnl.ca
1Corresponding author.
Manuscript received April 8, 2015; final manuscript received July 17, 2015; published online December 9, 2015. Assoc. Editor: Thomas Schulenberg.
ASME J of Nuclear Rad Sci. Jan 2016, 2(1): 011015 (9 pages)
Published Online: December 9, 2015
Article history
Received:
April 8, 2015
Revision Received:
July 17, 2015
Accepted:
August 5, 2015
Citation
Jiao, Y., Kish, J. R., Steeves, G., Cook, W. G., Zheng, W., and Guzonas, D. A. (December 9, 2015). "Effect of Thermal Pretreatment on the Corrosion of Stainless Steel in Flowing Supercritical Water." ASME. ASME J of Nuclear Rad Sci. January 2016; 2(1): 011015. https://doi.org/10.1115/1.4031125
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