Comparison of the stress corrosion cracking growth behavior of cold worked Alloy 690 in subcritical and supercritical water
Comparison of the stress corrosion cracking growth behavior of cold worked Alloy 690 in subcritical and supercritical water
复制标题
冷加工合金690在亚临界和超临界水中的应力腐蚀裂纹扩展行为比较
DOI：
10.1016/j.jnucmat.2019.04.017
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发表时间：
2019
影响因子：
3.1
通讯作者：
Lefu Zhang
中科院分区：
文献类型：
--
作者：
Kai Chen;Jiamei Wang;Zhao Shen;Donghai Du;Xianglong Guo;Bin Gong;Jinhua Liu;Lefu Zhang
研究了冷加工690合金在高温高压水中360 ~ 550 ℃的应力腐蚀裂纹扩展行为。在惰性氩气环境下，测量了各测试温度下的蠕变诱发裂纹。实验结果表明，在450 °C以上温度下，蠕变对裂纹扩展速率的贡献超过80%，而在360 °C温度下，蠕变对裂纹扩展速率的贡献仅为8%。定量鉴定了测试后标本的敏化程度，敏化程度随测试温度的升高而增加。敏化程度的增加也可能在总裂纹扩展速率中起一定作用。结果表明，冷加工690合金在亚临界温度和超临界温度下的主要开裂方式是不同的。在亚临界水环境中，腐蚀诱发裂纹控制裂纹扩展速率，而在超临界水环境中，蠕变是主导裂纹扩展速率的主要因素。
The stress corrosion cracking growth behavior of cold worked Alloy 690 has been studied in high temperature pressurized water at temperatures between 360 °C and 550 °C. Creep induced cracking was measured at each testing temperature in inert argon environment. Experimental results showed that creep contributed to more than 80% of the overall crack growth rate at temperatures above 450 °C, while only 8% at 360 °C. Sensitization of the post-tested specimens was quantitatively identified, which increased with the testing temperature. The increased degree of sensitization may also contribute to a portion in the overall crack growth rate. It was clearly proved that the dominant mode of cracking from subcritical to supercritical temperatures are different for cold worked Alloy 690. Corrosion induced cracking controls the crack growth rate in subcritical water environment, while creep is the major factor that dominates the cracking in supercritical water.