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    Examinations of oxidation and sulfidation of grain boundaries in alloy 600 exposed to simulated pressurized water reactor primary water

    Access Status
    Fulltext not available
    Authors
    Schreiber, D.
    Olszta, M.
    Saxey, David
    Kruska, K.
    Moore, K.
    Lozano-Perez, S.
    Bruemmer, S.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Schreiber, D. and Olszta, M. and Saxey, D. and Kruska, K. and Moore, K. and Lozano-Perez, S. and Bruemmer, S. 2013. Examinations of oxidation and sulfidation of grain boundaries in alloy 600 exposed to simulated pressurized water reactor primary water. Microscopy and Microanalysis. 19 (3): pp. 676-687.
    Source Title
    Microscopy and Microanalysis
    DOI
    10.1017/S1431927613000421
    ISSN
    1431-9276
    School
    John de Laeter CoE in Mass Spectrometry
    URI
    http://hdl.handle.net/20.500.11937/33048
    Collection
    • Curtin Research Publications
    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.

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