划伤690TT合金在高温含氧水中应力腐蚀裂纹萌生的研究

中国腐蚀与防护学报

2013, Vol. 33

Issue (5): 413-418

研究报告

本期目录 | 过刊浏览

划伤690TT合金在高温含氧水中应力腐蚀裂纹萌生的研究

孟凡江^1,2, 王俭秋², 韩恩厚², 柯伟²

1. 上海核工程研究设计院上海 200233; 2. 中国科学院金属研究所沈阳 110016

Stress Corrosion Crack Initiation for Scratched Alloy 690TT in Oxygenated High Temperature Water

MENG Fanjiang¹, WANG Jianqiu², HAN En-Hou², KE Wei²

1. Shanghai Nuclear Engineering Research and Design Institute，Shanghai，200233，China;
2. Institute of Metal Research，Chinese Academy of Sciences，Shenyang，110016，China

全文: PDF(5463 KB)

摘要: 利用划伤技术研究了690TT合金在325 ℃高温含氧硼锂水中的裂纹萌生和生长情况。试样表面和截面显微分析的结果表明，划伤沟槽底部局部萌生了典型的沿晶应力腐蚀裂纹。由于应力集中，在慢速率拉伸阶段划伤沟槽底部产生了机械裂纹，而机械裂纹成为恒载过程中690TT合金沿晶应力腐蚀裂纹萌生和生长的先导。尖端非常接近晶界或者沿着晶界的机械裂纹可继续形成沿晶应力腐蚀裂纹。690TT合金在恒载荷条件下对应力腐蚀开裂仍有一定的敏感性。

关键词 ： 690TT合金, 划伤, 应力腐蚀

Abstract：The stress corrosion crack (SCC) initiation of Alloy 690TT was studied by using scratch technique in oxygenated water at 325 ℃. The SEM results show that intergranular stress corrosion cracks were initiated at the bottom of the scratch groove，and the relevant mechanism was discussed. Mechanical cracks which were produced during slow strain rate tensile stage and tips ofthem highly approached to or were along grain boundaries，could be the precursor for stress corrosion crack initiation and growth in the following constant loading stage. Therefore，Alloy 690TT is susceptible to stress corrosion cracking in high temperature oxygenated water.

Key words： Alloy 690TT scratch SCC

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孟凡江, 王俭秋, 韩恩厚, 柯伟. 划伤690TT合金在高温含氧水中应力腐蚀裂纹萌生的研究[J]. 中国腐蚀与防护学报, 2013, 33(5): 413-418.
MENG Fanjiang, WANG Jianqiu, HAN En-Hou, KE Wei. Stress Corrosion Crack Initiation for Scratched Alloy 690TT in Oxygenated High Temperature Water. Journal of Chinese Society for Corrosion and protection, 2013, 33(5): 413-418.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2013/V33/I5/413

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