Evaluation of pitting corrosion in duplex stainless steel Fe20Cr9Ni for nuclear power application
文献类型：期刊论文
| 作者 | Chen, Yuefeng2; Yang, Bin1,2; Zhou, Yangtao3; Wu, Yuan1; Zhu, Huihui1 |
| 刊名 | ACTA MATERIALIA
 |
| 出版日期 | 2020-09-15 |
| 卷号 | 197页码:172-183 |
| 关键词 | Duplex stainless steel Spinodal decomposition G-phase Pitting corrosion Strain field |
| ISSN号 | 1359-6454 |
| DOI | 10.1016/j.actamat.2020.07.046 |
| 通讯作者 | Yang, Bin(byang@ustb.edu.cn) |
| 英文摘要 | A spinodal decomposition is often carried out in the austenite-ferrite duplex stainless steel Fe20Cr9Ni during long-term service at a temperature in the range from 280 to 320 degrees C, resulting in a decrease of pitting corrosion resistance. Fe-rich alpha phase rather than G-phase has been suggested as the major reason for the deterioration in pitting corrosion resistance of the thermally-aged steel. Here, we found that similar to 76.8% of the decline in pitting resistance for the duplex stainless steel Fe20Cr9Ni was attributed to G-phase, and similar to 23.2% to Fe-rich alpha phase after the spinodal decomposition. In this study, a suitable thermal aging treatment was introduced to obtain a larger size of the G-phase and to study the role of the phase in the corrosion process. Through immersing thermally-aged TEM specimen treated at 475 degrees C for 3000 h in NaCl solution, the preferential position of corrosion pits formed in the ferrite was obtained. The composition changes and strain field distribution around the G-phase were analyzed by TEM-EDS, 3DAPT and GPA techniques. We further found that, although the concentration difference of Cr element between alpha and alpha' phases was as high as 60 at.%, corrosion pits were initiated at the interface between the G-phase and the ferrite matrix rather than in the Fe-rich alpha phase, indicating that the Cr-depleted theory could not explain the aforesaid phenomenon. The strain energy at the interface between the G-phase and the ferrite matrix was found to be the largest. The atoms at the interface have higher energy than in the intracrystalline, and thus easily react with Cl- ions in the solution to form pits finally. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| 资助项目 | Beijing Municipal Natural Science Foundation[2162026] ; National High Technology Research and Development Program of China (863 Program)[2008AA031702] ; National High Technology Research and Development Program of China (863 Program)[2012AA03A507] |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000564767000008 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | Beijing Municipal Natural Science Foundation ; National High Technology Research and Development Program of China (863 Program) |
| 源URL | [http://ir.imr.ac.cn/handle/321006/140412]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Yang, Bin |
| 作者单位 | 1.Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China 2.Univ Sci & Technol Beijing, Collaborat Innovat Ctr Steel Technol, Beijing 100083, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Yuefeng,Yang, Bin,Zhou, Yangtao,et al. Evaluation of pitting corrosion in duplex stainless steel Fe20Cr9Ni for nuclear power application[J]. ACTA MATERIALIA,2020,197:172-183. |
| APA | Chen, Yuefeng,Yang, Bin,Zhou, Yangtao,Wu, Yuan,&Zhu, Huihui.(2020).Evaluation of pitting corrosion in duplex stainless steel Fe20Cr9Ni for nuclear power application.ACTA MATERIALIA,197,172-183. |
| MLA | Chen, Yuefeng,et al."Evaluation of pitting corrosion in duplex stainless steel Fe20Cr9Ni for nuclear power application".ACTA MATERIALIA 197(2020):172-183. |
入库方式： OAI收割
来源：金属研究所
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