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

D.K. Schreiber, M.J. Olszta, David Saxey, K. Kruska, K.L. Moore, S. Lozano-Pérez, S.M. Bruemmer

Research output: Contribution to journalArticle

45 Citations (Scopus)

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. Copyright © Microscopy Society of America 2013 Â.
Original languageEnglish
Pages (from-to)676-687
JournalMicroscopy and Microanalysis
Volume19
Issue number3
DOIs
Publication statusPublished - 2013

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