冷变形316 L不锈钢在高温高压水中的应力腐蚀

采用恒应力强度因子K=33 MPa·m1/2的加载方法，利用直流电压降方法在线监测核辅管道316L不锈钢在高纯水中应力腐蚀裂纹扩展速率。对比200、250、280和325℃温度下，氩气除氧和含有2 mg·L-1溶解氧的水化学环境中材料的裂纹扩展速率发现：溶解氧为2 mg·L-1时的裂纹扩展速率明显比氩气除氧时的裂纹扩展速率高。氩气除氧时，裂纹扩展速率在250℃时有一个最高点；溶解氧为2 mg·L-1的条件下，裂纹扩展速率随温度的升高而升高。

Stress corrosion cracking of cold worked 316 L stainless steel in high temperature and high pressure pure water

The stress corrosion cracking growth behavior of 316L stainless steel, which is used as nuclear auxiliary pipelines, was continuously monitored by a direct current potential drop method under a constant stress intensity factor K of 33 MPa·m1/2 . By compa-ring the cracking behavior of this material at 200, 250, 280 and 325℃ in 2 mg·L-1 oxygenated water and deoxygenated water, we found that the crack growth rate is faster in the oxygenated water than in the deoxygenated water. Experimental results also show that there is a peak of the crack growth rate of this material in the deoxygenated water at 250℃, while the crack growth rate increases with the rise of temperature in the oxygenated water.