【摘要】 用慢应变速率拉伸试验方法研究了１８Ｍｎ５Ｃｒ护环钢在９０℃去离子水和２２％ＮａＣｌ水溶液以及饱和ＮａＮＯ３水溶液中的应力腐蚀开裂（ＳＣＣ）行为．结果表明，１８Ｍｎ５Ｃｒ钢在三种介质中对ＳＣＣ都较敏感，电位对该钢的ＳＣＣ抗力有明显影响，溶液的ｐＨ值对其影响不大．文中还用悬臂梁弯曲试验法测定了试验用钢在三种介质中的应力场强度因子Ｋ更多还原

【Abstract】 The stress corrosion cracking (SCC) behavior of 18Mn5Cr steel for retaining ring was studied in aerated water. 22%NaCl solution and saturated NaNO 3 solution at 90℃ by the slow strain rate test. The results showed that 18Mn5Cr steel was susceptible to SCC in above three mediums, the applied potential had obvious effect on SCC resistance, however, the pH value of the solutions did little. The stress intensity factor K ISCC in three mediums was also measured by the cantilever beam bending test.更多还原