304不锈钢应力腐蚀行为研究  

Study on Stress Corrosion Behavior of 304 Stainless Steel

作　　者：张尧 王建刚[2] Zhang Yao;Wang Jiangang(China Petroleum Materials Procurement Center(China Petroleum Materials Corporation),Beijing,100000;Hebei Key Laboratory of Material Near-Net Korming Technology,College of Materials Science and Engineering,Hebei University of Science and Technology,Hebei,050018)

机构地区：[1]中国石油物资采购中心(中国石油物资有限公司),北京100000 [2]河北科技大学材料科学与工程学院河北省材料近净成形重点实验室,河北050018

出　　处：《当代化工研究》2022年第16期127-129,共3页Modern Chemical Research

基　　金：河北省教育厅重点项目“新型多层梯度镁基储氢材料制备关键技术”(项目编号:ZD2020189);河北省科技支撑计划“陆军装备机器人熔覆修复系统关键技术研发与示范应用(项目编号:20351801D);河北省科技支撑计划“河北华普化工设备科技有限公司新型研发机构建设”(项目编号:20564401D)。

摘　　要：本文进行慢应变速率应力腐蚀试验附以不同浓度氯离子水雾腐蚀介质,采用金相显微镜、扫描电镜(SEM)和扫描探针显微镜(AFM)对试样组织微观形态进行观察分析。对应变诱发马氏体相变机理及氯离子对奥氏体不锈钢耐蚀性的影响进行探讨,研究结果表明不锈钢中奥氏体处于亚稳态,一定量变形将诱导马氏体相变,且变形量越大,马氏体相越多。在10%以内变形,奥氏体晶界比晶粒内部变形更大。马氏体优先在晶界处形核长大。随着应变增大,晶粒内部也产生马氏体。奥氏体不锈钢在应力存在条件下,对含氯离子的氯化钠腐蚀介质敏感。氯离子破坏不锈钢钝化膜,使腐蚀加重,氯离子浓度越高,腐蚀越严重。In this paper,the slow strain rate stress corrosion test was carried out with water mist corrosion medium with different concentrations of chloride ions.The microstructure of the sample was observed and analyzed by metallographic microscope,scanning electron microscope(SEM)and scanning probe microscope(AFM).The mechanism of strain-induced martensitic transformation and the effect of chloride ions on corrosion resistance of austenitic stainless steel were discussed.The results show that austenite in stainless steel is in metastable state,and a certain amount of deformation will induce martensitic transformation,and the larger the deformation,the more martensite.Within 10%of deformation,the deformation of austenite grain boundary is larger than grain internal deformation.Martensite was preferred to nucleate and grow at grain boundaries.With the increase of strain,martensite is also produced in the grains.Austenitic stainless steel is sensitive to Chloride corrosive medium containing chloride ions in the presence of stress.Chloride ion damages the passivation film of stainless steel,aggravating the corrosion.The corrosion of chlorine ion concentration is higher,the more serious.

关 键 词：奥氏体不锈钢 形变诱发马氏体相变 氯离子水雾介质 AFM 

分 类 号：TG1[金属学及工艺—金属学]