2种终轧/开冷温度DSS 2304复合板复层组织与耐腐蚀性能对比研究  

Comparative Study on the Microstructure and Corrosion Properties of DSS 2304 Clad Plates at Two Different Finishing/Cooling Temperatures

作　　者：张鑫钰 查小琴[1,2] 高灵清 张文利[1] 马云飞 ZHANG Xin-yu;ZHA Xiao-qin;GAO Ling-qing;ZHANG Wen-li;MA Yun-fei(Luoyang Ship Material Research Institute,Henan Luoyang 471023,China;Henan Key Laboratory of Technology and Ap-plication of Structural Materials for Ships and Marine Equipments,Henan Luoyang 471023,China;College of Materials Sci-ence and Engineering,Henan University of Science and Technology,Henan Luoyang 471023,China)

机构地区：[1]中国船舶重工集团公司第七二五研究所,河南洛阳471023 [2]河南省船舶及海工装备结构材料技术与应用重点实验室,河南洛阳471023 [3]河南科技大学材料科学与工程学院,河南洛阳471023

出　　处：《装备环境工程》2022年第10期94-100,共7页Equipment Environmental Engineering

基　　金：国家重点研发计划项目(2016YFC0401205)。

摘　　要：目的 对比研究2种不同终轧/开冷温度的2304/Q345C热轧双相不锈钢复合板复层组织和耐腐蚀性能。方法 分别采用金相显微镜和透射电镜观察复层组织形貌,采用铁素体测量仪分析计算复层远界面铁素体组织。分别采用化学浸泡法及电化学法测试复层抗点蚀和晶间腐蚀性能,并对其组织进行金相观察和透射分析。采用万能试验机对界面进行剪切强度测试,对界面附近进行线扫描测试分析,进一步分析剪切性能测试结果。结果 在其他热轧参数一定的情况下,终轧/开冷温度为1050/1020℃的复合板复层组织中的铁素体含量较高,奥氏体/铁素体相界更为规整,位错密度较低,晶界未发现析出相,界面剪切强度较高,复层的耐点腐蚀、晶间腐蚀及腐蚀电化学性能均较优。结论 终轧/开冷温度为1050/1020℃的热轧双相不锈钢复合板复层具有更优的耐腐蚀性能。This paper aims to take comparative study on the corrosion resistance properties of two 2304/Q345C hot-rolled duplex stainless steel clad plates with different finishing/cooling temperatures by chemical immersion tests and electrochemical tests. in addition, the metallographic microstructure and TEM images analysis were also conducted. The results show that compared with the clad plate at finishing/cooling temperature 950/920 ℃ and the same other hot-rolled parameters, the ferrite content in cladding is higher at finishing/cooling temperature 1 050/1 020 ℃,the austenite/ferrite phase boundary of clad plate is more regular, and the dislocation density is lower with no precipitate around phase boundary. Besides, the interfacial shear strength is higher at 1 050/1 020 ℃, and the properties of pitting corrosion, intergranular corrosion resistance, and corrosion electrochemical performance of cladding layer are excellent.

关 键 词：2304/Q345C复合板 热轧复合法 剪切强度 晶间腐蚀 点蚀 电化学腐蚀 

分 类 号：TG142[一般工业技术—材料科学与工程] TG115[金属学及工艺—金属材料]