Stress Corrosion Cracking Behavior of 508Ⅲ LAS for RPV in High Temperature and High Pressure B/Li Water Environment
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摘要: 通过直流电压降法在线测量了反应堆压力容器用508Ⅲ低合金钢在模拟压水堆高温高压硼锂水环境中应力腐蚀开裂的裂纹扩展曲线，评估了其在含氧含氯离子环境中的应力腐蚀开裂敏感性。结果表明：在较低的恒载荷条件下，508Ⅲ低合金钢在含氧或除氧的300 ℃硼锂水环境中的裂纹扩展速率均低于BWRVIP-60 Line 1预测曲线，且对氧化性介质和低含量的杂质离子具有较高的应力腐蚀开裂容忍度，但腐蚀性介质或载荷的突变会造成裂纹扩展速率激增的现象；在含氧及除氧水环境中该合金的应力腐蚀开裂均由穿晶开裂主导，且裂纹尖端存在剧烈的金属溶解和氧化，大量的氧化物形成是造成裂纹尖端变“钝”，裂纹扩展速率降低的主要原因。Abstract: The stress corrosion crack growth curves of 508Ⅲ low alloy steel (LAS) for reactor pressure vessel (RPV) in a high temperature and high pressure boron-lithium water environment simulating pressurized water reactor (PWR) were measured online by direct current potential drop method. The stress corrosion cracking susceptibility of the LAS in an oxygen-containing and chloride-containing environment was evaluated. The results show that under relatively low constant load conditions, the crack growth rate of the 508Ⅲ LAS was lower than the predicted curve of BWRVIP-60 Line 1 in a 300 ℃ boron-lithium water environment whether it contained oxygen or not. And the 508Ⅲ LAS had a high stress corrosion cracking tolerance to oxidizing media and low concentration impurity ions, but the sudden change of corrosive medium or load resulted in a rapid increase in crack growth rate. The stress corrosion cracking of the LAS in oxygen-containing or de-oxygenated water environment was dominated by transcrystalline cracking, and there was violent metal dissolution and oxidation at the crack tip. The formation of a large amount of oxide was the main reason for being “blunt” of crack tip and the decrease of crack growth rate.
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期刊类型引用(1)
1. 郭远航. 压力容器腐蚀原因分析及解决对策. 化工管理. 2023(23): 106-109 . 
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