摘要
用恒变形Ｕ形试件应力腐蚀试验、电化学极化和ＡＥＳ分析法研究了１Ｃｒ１８Ｎｉ９Ｔｉ奥氏体不锈钢在室温Ｈ２Ｓ水溶液和９０℃的Ｈ２Ｓｅ＋０．６ｍｏｌ／ＬＮａＣｌ水溶液中的应力腐蚀破裂，两种条件下都发现了台阶状的应力腐蚀裂纹。９０℃时的破裂由〔Ｃｌ〕导致的阳极溶解机理控制，沿夹杂物／基体界面及轧制方向晶界的择优溶解导致台阶状裂纹。在室温无ＮａＣｌ的Ｈ２Ｓ溶液中，破裂机理为氢致开裂，塑性变形造成的局部硬度增高可能是破裂的诱因。
Stress corrosion cracking of austenitic 1Crl8Ni9Ti stainless steel in aqueous HwS solution at room temperature and in H25+0.6 mol / L NaCl solution at 90℃ was studied using U-bend specimen test, electrochemical polarization, SEM and AES. Stepwise cracks were found under both conditions. Different mechanisms for cracking of the steel at 90℃ and at room temperature were suggested.
关键词
奥氏体不锈钢
硫化氢
应力腐蚀
不锈钢
austenitic stainless steel
hydrogen sulfide
stress corrosion cracking
