时效温度对节镍双相不锈钢S32101晶间腐蚀行为影响的研究  

Effects of Aging Temperature on Intergranular Corrosion Behavior of S32101 Lean Duplex Stainless Steel

作　　者：何燕[1] 张彩丽[1] 王剑[1] 李娟[1] 许航[1] 秦丽雁[2] 韩培德[1] 

机构地区：[1]太原理工大学材料科学与工程学院新材料界面科学与工程教育部重点实验室,太原030024 [2]太原钢铁(集团)有限公司技术中心,太原030003

出　　处：《腐蚀科学与防护技术》2016年第3期241-246,共6页Corrosion Science and Protection Technology

基　　金：国家自然科学基金项目(51371123);高等学校博士学科重点博导基金项目(2013140211003);山西省自然科学基金项目(2014011002)资助

摘　　要：采用金相显微镜(OM)、显微硬度仪、电化学动电位再活化法(EPR)和电化学阻抗谱(EIS)对不同温度时效态S32101节镍双相不锈钢的显微组织、显微硬度和耐蚀性进行研究。结果表明:随时效温度从300℃升高,显微硬度增加,钝化膜致密性和耐蚀性下降;700℃时,相界处出现明显析出相,为碳氮化物和二次奥氏体组成的混合相,显微硬度达最大,钝化膜致密性和耐蚀性最差,几乎整个铁素体相被腐蚀,腐蚀机理是铁素体相的选择性溶解;继续升高到900℃,析出相减少,硬度下降,钝化膜致密性变好,耐蚀性提高。The microstructure,microhardness and corrosion resistance of S32101 lean duplex stainless steel after aging treatment at temperatures in a range from 300 ℃ to 900 ℃ were characterized by means of optical microscope（OM）, microhardness testers, electrochemical potentiodynamic reactivation（EPR）, electrochemical impedance spectroscopy（EIS）. The result showed that with the increasing aging temperature, the hardness increased, the passivation film would become uneven and less dense, so the corrosion resistance relative declined. When the aging temperature was700 ℃, obvious precipitates occurred at the phase boundaries, which were a mixture of carbon or nitride and secondary austenite; while the microhardness reached a maximum and the compactness of passivation film was worst, thereby, the corrosion resistance became worst; correspondingly corrosion occurred on nearly entire the ferrite phase in the steel, which indicated that the corrosion mechanism was a selective dissolution of ferrite phase. As the aging temperature raised up to900 ℃, the number of precipitates reduced, the microhardness decreased, the passivation film would become dense and the corrosion resistance was enhanced.

关 键 词：节镍双相不锈钢 时效处理 晶间腐蚀 析出相 钝化膜 

分 类 号：TF764[冶金工程—钢铁冶金]