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Examinations of Oxidation and Sulfidation of Grain Boundaries in Alloy 600 Exposed to Simulated Pressurized Water Reactor Primary Water

Published online by Cambridge University Press:  17 April 2013

D.K. Schreiber ,
M.J. Olszta ,
D.W. Saxey ,
K. Kruska ,
K.L. Moore ,
S. Lozano-Perez  and
S.M. Bruemmer
D.K. Schreiber*
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352, USA
M.J. Olszta
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352, USA
D.W. Saxey
Affiliation:
University of Oxford, Department of Materials, Parks Road, Oxford OX1 3PH, UK
K. Kruska
Affiliation:
University of Oxford, Department of Materials, Parks Road, Oxford OX1 3PH, UK
K.L. Moore
Affiliation:
University of Oxford, Department of Materials, Parks Road, Oxford OX1 3PH, UK
S. Lozano-Perez
Affiliation:
University of Oxford, Department of Materials, Parks Road, Oxford OX1 3PH, UK
S.M. Bruemmer
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352, USA
*
*Corresponding author. E-mail: [email protected]
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Abstract

High-resolution characterizations of intergranular attack in alloy 600 (Ni-17Cr-9Fe) exposed to 325°C simulated pressurized water reactor primary water have been conducted using a combination of scanning electron microscopy, NanoSIMS, analytical transmission electron microscopy, and atom probe tomography. The intergranular attack exhibited a two-stage microstructure that consisted of continuous corrosion/oxidation to a depth of ~200 nm from the surface followed by discrete Cr-rich sulfides to a further depth of ~500 nm. The continuous oxidation region contained primarily nanocrystalline MO-structure oxide particles and ended at Ni-rich, Cr-depleted grain boundaries with spaced CrS precipitates. Three-dimensional characterization of the sulfidized region using site-specific atom probe tomography revealed extraordinary grain boundary composition changes, including total depletion of Cr across a several nm wide dealloyed zone as a result of grain boundary migration.

Keywords

atom probe tomographytransmission electron microscopyNanoSIMSscanning electron microscopycorrosionoxidationsulfidationintergranular attack
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 19 , Issue 3 , June 2013 , pp. 676 - 687
Copyright
Copyright © Microscopy Society of America 2013 

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Footnotes

†

Current address: School of Physics, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia

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