阴极极化条件下316L不锈钢循环应变电极行为及其损伤演变  

ELECTROCHEMICAL DETECTION OF DAMAGE BEHAVIOR OF CYCLIC STRAINING 316L ELECTRODE IN 3.5%NaCl SOLUTION AT CONTROLLED CATHODIC POTENTIAL

作　　者：谭伟[1] 

机构地区：[1]装甲兵工程学院材料科学与工程系

出　　处：《机械强度》2004年第z1期42-45,共4页Journal of Mechanical Strength

基　　金：中国科学院沈阳金属研究所腐蚀与防护国家重点实验室资助~~

摘　　要：采用应变电极方法研究在阴极极化条件下 3 16L奥氏体不锈钢在 3 5 %NaCl水溶液中的低周循环应变电极行为及其损伤演变。研究表明 ,通过对瞬态应变电流Ist演变进行合理的解析 ,可以实时地获得 3 16L应变电极的损伤演化信息。当试样表面未出现裂纹时 ,只存在一个应变电流峰 -Ist,p1 ,对应于最大拉伸位移幅ΔLmax,最大压缩位移幅ΔLmin与-min Ist 对应。当试样表面出现细观裂纹或裂纹扩展时 ,ΔLmin与 -min IstFatigue damage behavior of polycrystalline 316L stainless steel has been detected by means of cyclic straining electrode test in 3.5%NaCl aqueous solution of pH6 at controlled cathodic potential. The experiment results show that in-situ fatigue damaging evolution of cyclic straining 316L electrode can be followed by interpretation of the recorded current transients I_(st). Before surface-related cracks appear on the straining electrode, cyclic current peak-I_(st,p1) and minimal current-min I_(st) correspond to cyclic displacement amplitude ΔL_(max) and ΔL_(min) respectively. However, once microcracks occur, correlation can not be observed between -min I_(st) and cyclic compressive displacement amplitude ΔL_(min) in each cycle.

关 键 词：应变电极 应变电流 疲劳 损伤 裂纹 

分 类 号：TG142.71[一般工业技术—材料科学与工程] O346.23[金属学及工艺—金属材料]