一种新型核级奥氏体不锈钢焊接接头的晶间腐蚀研究  

Research on intergranular corrosion of welded joint of nuclear-grade austenitic stainless steel

作　　者：罗锐[1] 程晓农[1] 李冬升[1] 徐桂芳[1] 高佩[2] 郭顺[1] 邱宇[3] 郑琦[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]江苏银环精密钢管股份有限公司,江苏宜兴214203 [3]中国搅拌摩擦焊中心北京赛福斯特技术有限公司,北京100024

出　　处：《功能材料》2014年第23期23033-23037,共5页Journal of Functional Materials

基　　金："十二五"国家高技术研究发展计划(863计划)重大资助项目(2012AA03A501)

摘　　要：利用"不锈钢硫酸-硫酸铜腐蚀实验"、光学显微镜和扫描电镜等测试方法分别对未敏化和经敏化处理(650℃×100 h)的800H和新型Cr18Ni30Mo2Al3Nb合金焊接接头的抗晶间腐蚀性能进行研究,结果表明,800H和Cr18Ni30Mo2Al3Nb接头焊缝组织均为单一的奥氏体基体,800H合金中TiN缺陷处易引起点蚀,而Cr18Ni30Mo2Al3Nb无明显点蚀现象;对比腐蚀失重、腐蚀深度等实验结果,未敏化和敏化态Cr18Ni30Mo2Al3Nb焊接接头的抗晶间腐蚀性能明显优于相同状态的800H。The tendency to intergranular corrosion of the welded joints of 800H and Cr18Ni30Mo2Al3Nb alloy was investigated.Sensitizing treatment of 650 ℃×100 h and no treatment was used.The microstructure,morpholo-gy and the intergranular corrosion resistance of samples were studied by optical microscope、SEM and Method of copper sulfate-sulfuric acid test for stainless steels.The results show that the dissimilar welded j oints are all the single austenite (γ)organizations.TiN inclusions lead to pitting corrosion in alloy 800H.However,no excessive pitting corrosion in Cr18 Ni30 Mo2 Al3 Nb alloy.As can be seen from the weightlessness,corrosion depth test re-sults,clearly shown that Cr18 Ni30 Mo2 Al3 Nb welded joint has better intergranular corrosion resistance than 800H.

关 键 词：核电 奥氏体不锈钢 焊接 晶间腐蚀 

分 类 号：TG456[金属学及工艺—焊接]