Effect of Surface Scratch on Corrosion Behavior of Alloy 690TT Heat Exchanger Tubes

被引：0
作者：
Meng F. [1 ]
Wu B. [2 ,3 ]
Lv Y. [4 ]
Ming H. [2 ]
Bao Y. [1 ]
Wang J. [2 ]
Han E.-H. [2 ]
机构：
[1] Shanghai Nuclear Engineering Research & Design Institute Ltd. Co., Shanghai
[2] CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang
[3] School of Materials Science and Engineering, University of Science and Technology of China, Shenyang
[4] Nuclear and Radiation Safety Center, Beijing
来源：
Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | 2021年 / 35卷 / 11期
基金：
中国国家自然科学基金;
关键词：
Alloy; 690TT; Metallic materials; Microstructure; SCC; Surface scratch;
D O I：
10.11901/1005.3093.2021.001
中图分类号：
学科分类号：
摘要：
Three kinds of samples with different scratch depths on the surface of alloy 690TT for heat exchanger tubes are prepared. The microstructure changes caused by scratch and the effect of scratches on the corrosion and SCC behavior were systematically investigated. The results show that severe plastic deformation occurred near the scratch bank and the scratched groove. A large number of sliding steps and tear deformation generated near the scratched bank. The scratch depth had no obvious influence on the morphology, composition and distribution of corrosion products in different areas of scratches. As the scratch depth increased both the number and the length of SCC cracks increased, indicating that the SCC sensitivity of the material increased. Defects such as slip steps and micro cracks produced during the scratching process were likely to be the preferential positions of SCC initiation. © 2021, Editorial Office of Chinese Journal of Materials Research. All right reserved.
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页码：827 / 834
页数：7
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