Effect of Ta addition on irradiation resistance properties of austenitic stainless steels for reactor pressure vessel internals

Yun Wang, Hideo Watanabe, Dongyue Chen, Junya Kaneda, Naoto Shigenaka

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

抄録

In order to elevate the resistance against irradiation-assisted stress corrosion cracking (IASCC) of reactor pressure vessel internals (RINs) in the environment of boiling water reactor (BWR), austenitic stainless steels (SSs) with tantalum (Ta) addition have been examined. The oversized element Ta is considered to reduce the concentration of free vacancy due to trapping effect. It is expected that radiation-induced grain boundary (GB) segregation of constituent element such as chromium (Cr) can be suppressed by Ta addition. In this study the irradiation tests were performed with Fe2+ ion in a dose range from 0.1 to 3 dpa on the specimens sampled from base materials and heat-affected zone (HAZ) of welding joint plates. Considering the Cr segregation might also occur during the heat history of welding process, we first confirmed and discussed the effect of Ta addition to SUS310S on irradiation resistance properties in the HAZ. The radiation-induced segregation (RIS) on random GBs in HAZ after the irradiation tests was evaluated by scanning transmission electron microscope (STEM) and X-ray energy dispersive spectroscopy (XEDS). The improvement of resistance against RIS by Ta addition was evaluated. Further the effect of Ta addition on radiation induced hardening was investigated on the base materials, but from the results of nanoindentation test the obvious relief of radiation-induced hardening was not confirmed. The corrosion properties after heavy ion irradiation were also discussed on the base materials in the conditions of electrochemical potentiokinetic reactivation (EPR) test. GB corrosion was observed on the ion-irradiated surface of commercial material of SUS310S. However, no GB corrosion was observed on the irradiated surface of SUS310S with 0.4 % Ta addition, indicating the effect of Ta addition on the improvement of resistance against IASCC.

本文言語英語
ホスト出版物のタイトルProceedings of the 27th International Conference on Nuclear Engineering, ICONE 2019 - "Nuclear Power Saves the World!"
出版社American Society of Mechanical Engineers (ASME)
ISBN(電子版)9784888983051
出版ステータス出版済み - 5 18 2019
イベント27th International Conference on Nuclear Engineering: Nuclear Power Saves the World!, ICONE 2019 - Tsukuba, Ibaraki, 日本
継続期間: 5 19 20195 24 2019

出版物シリーズ

名前International Conference on Nuclear Engineering, Proceedings, ICONE
2019-May

会議

会議27th International Conference on Nuclear Engineering: Nuclear Power Saves the World!, ICONE 2019
Country日本
CityTsukuba, Ibaraki
Period5/19/195/24/19

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering

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