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

被引：46

作者：

Schreiber, D. K. ^{[1
]}

Olszta, M. J. ^{[1
]}

Saxey, D. W. ^{[2
]}

Kruska, K. ^{[2
]}

Moore, K. L. ^{[2
]}

Lozano-Perez, S. ^{[2
]}

Bruemmer, S. M. ^{[1
]}

机构：

[1] Pacific NW Natl Lab, Richland, WA 99352 USA

[2] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

来源：

MICROSCOPY AND MICROANALYSIS | 2013年 / 19卷 / 03期

基金：

英国工程与自然科学研究理事会;

关键词：

atom probe tomography; transmission electron microscopy; NanoSIMS; scanning electron microscopy; corrosion; oxidation; sulfidation; intergranular attack; 3-DIMENSIONAL ATOM-PROBE; STRESS-CORROSION CRACKING; SPECIMEN PREPARATION; HOT CORROSION; SEGREGATION; TOMOGRAPHY; SULFUR; TEM; NI; MECHANISM;

D O I：

10.1017/S1431927613000421

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High-resolution characterizations of intergranular attack in alloy 600 (Ni-17Cr-9Fe) exposed to 325 degrees 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 similar to 200 nm from the surface followed by discrete Cr-rich sulfides to a further depth of similar to 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.

引用

页码：676 / 687

页数：12

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