冷變形316L不銹鋼在高溫高壓水中的應力腐蝕

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

摘要: 采用恒應力強度因子K=33 MPa·m^1/2的加載方法,利用直流電壓降方法在線監測核輔管道316L不銹鋼在高純水中應力腐蝕裂紋擴展速率.對比200、250、280和325℃溫度下,氬氣除氧和含有2 mg·L^-1溶解氧的水化學環境中材料的裂紋擴展速率發現:溶解氧為2 mg·L^-1時的裂紋擴展速率明顯比氬氣除氧時的裂紋擴展速率高.氬氣除氧時,裂紋擴展速率在250℃時有一個最高點;溶解氧為2 mg·L^-1的條件下,裂紋擴展速率隨溫度的升高而升高.

Abstract: 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·m^1/2. By comparing 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.