Microstructure and intergranular stress corrosion cracking susceptibility of a SA508-52M-316L dissimilar metal weld joint in primary water

被引：49

作者：

Dong, Lijin ^{[1
,2
]}

Peng, Qunjia ^{[2
]}

Han, En-Hou ^{[2
]}

Ke, Wei ^{[2
]}

Wang, Lei ^{[1
]}

机构：

[1] Northeastern Univ, Minist Educ, Key Lab Anisotropy & Texture Mat, Shenyang 110819, Liaoning, Peoples R China

[2] Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China

来源：

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2018年 / 34卷 / 08期

基金：

中国国家自然科学基金;

关键词：

Dissimilar metal weld joint; Stress corrosion cracking; Microstructure; High temperature water; Slow strain rate tension; HIGH-TEMPERATURE WATER; ENVIRONMENTALLY ASSISTED CRACKING; BWR COOLANT ENVIRONMENTS; FUSION BOUNDARY REGION; HEAT-AFFECTED ZONE; ALLOY; 690TT; STAINLESS-STEELS; BEHAVIOR; GTAW; NI;

D O I：

10.1016/j.jmst.2017.11.051

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Correlation of microstructure and intergranular stress corrosion cracking (IGSCC) susceptibility for the SA508-52M-316L dissimilar metal weld joint in primary water was investigated by the interrupted slow strain rate tension test following a microstructure characterization. The susceptibility to IGSCC in various regions of the dissimilar metal weld joint was observed to follow the order of Alloy 52Mb> the heat affected zone of 316L> the dilution zone of Alloy 52 Mw> Alloy 52 Mw weld metal. The chromium-depletion at the grain boundary is the dominant factor causing the high IGSCC susceptibility of Alloy 52Mb. However, IGSCC initiation in the heat affected zone of 316L is attributed to the increase of residual strain adjacent to the grain boundary. In addition, the decrease of chromium content and increase of residual strain adjacent to the grain boundary increase the IGSCC susceptibility of the dilution zone of Alloy 52 Mw. (C) 2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

引用

页码：1281 / 1292

页数：12

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