Effect of cold work on the stress corrosion cracking behavior of Alloy 690 in supercritical water environment
Effect of cold work on the stress corrosion cracking behavior of Alloy 690 in supercritical water environment
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DOI：
10.1016/j.jnucmat.2017.10.003
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发表时间：
2018
影响因子：
3.1
通讯作者：
Kai Chen;Donghai Du;Wenhua Gao;Xianglong Guo;Le-fu Zhang;P. Andresen
中科院分区：
文献类型：
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作者：
Kai Chen;Donghai Du;Wenhua Gao;Xianglong Guo;Le-fu Zhang;P. Andresen
研究了 0、20% 和 30% 冷加工 (CW) 的 690 合金在超临界水 (SCW) 环境中的应力腐蚀开裂 (SCC) 行为，重点是 CW 和 CGR 蠕变 (CGR)。 SCC 和蠕变 CGR 随 %CW 的增加而增加，这与硬度有很好的相关性。裂纹尖端和断裂表面的微观表征显示出明显的空腔特征，这是蠕变攻击的明显证据。惰性气体中的蠕变 CGR 与 SCW 中的 SCC CGR 相当，表明蠕变是裂纹扩展的主要因素。研究发现，增加 CW 水平会增加蠕变敏感性，并且在 500 °C 至 550 °C 之间观察到蠕变裂纹扩展的高活化能。
The stress corrosion cracking (SCC) behavior of Alloy 690 with 0, 20% and 30% cold work (CW) was studied in supercritical water (SCW) environment with an emphasis on CW and creep on the CGRs (CGR). SCC and creep CGRs increased with %CW, which correlated hardness very well. Microscopic characterization of the crack tip and fracture surface showed obvious cavity-like features, which is clear evidence of creep attack. The creep CGRs in inert gas were comparable to the SCC CGRs in SCW, indicating that creep is a major factor in crack growth. Increasing level of CW was found to increase the creep susceptibility, and high activation energies for creep crack growth were observed between 500 °C and 550 °C.