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Microstructural study on the stress corrosion cracking of alloy 690 in simulated pressurized water reactor primary environment

科研成果: 书/报告/会议事项章节会议稿件同行评审

4 引用 (Scopus)

摘要

This study was aimed at investigating the intergranular attack near a stress corrosion crack (SCC) of alloy 690 in simulated pressurized water reactor (PWR) primary water environment. Solution annealed alloy 690 was evaluated for its SCC initiation susceptibility in 360, °C hydrogenated pure water using slow strain rate tensile technique. After the test, a grain boundary showing SCC initiation was sampled with Focused Ion Beam (FIB) milling. The microstructure and elemental distribution near the crack tip were studied using transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). The results show that intergranular oxidation occurs ahead of the crack tip and is preceded by diffusion induced grain boundary migration. The oxides at the crack tip are mainly composed of NiO and Cr2O3 which maintain rigid orientations with the neighboring grains. The adjacent migration zone is free of oxidization as a compact layer of Cr2O3 dominates at the oxide/substrate interfaces and the very tip region.

源语言英语
主期刊名Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors
编辑Denise Paraventi, Michael Wright, John H. Jackson
出版商Springer International Publishing
535-545
页数11
ISBN(印刷版)9783319672434
DOI
出版状态已出版 - 2018
已对外发布
活动18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017 - Portland, 美国
期限: 13 8月 201717 8月 2017

出版系列

姓名Minerals, Metals and Materials Series
Part F9
ISSN(印刷版)2367-1181
ISSN(电子版)2367-1696

会议

会议18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017
国家/地区美国
Portland
时期13/08/1717/08/17

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