HastelloyC-4焊接接头耐晶间腐蚀性能研究  

Resistance Property to Intergranular Corrosion of HastelloyC-4 Welding Joint

作　　者：倪加明[1] 李铸国[1] 黄坚[1] 吴毅雄[1] 

机构地区：[1]上海交通大学上海市激光制造与材料改性重点实验室,上海200240

出　　处：《材料工程》2010年第1期82-84,88,共4页Journal of Materials Engineering

基　　金：国家科技部国际科技合作项目(2006DF52680)

摘　　要：采用多层多道氩弧焊接HastelloyC-4材料,通过对比实验研究焊接接头和母材的耐晶间腐蚀性能,并通过显微硬度、金相显微镜、扫描电子显微镜、能谱分析表征接头组织和成分。结果表明:接头试样的平均腐蚀速率小于母材试样,接头耐晶间腐蚀性能较好。采用Cr含量高配比填充焊丝,同时严格控制层间温度,利用焊接热循环固溶处理已有焊缝,促进焊缝成分均匀,改善接头在氧化性介质中耐晶间腐蚀性能。HastelloyC-4 pipeline was welded by multi-pass arc welding.Contrastive determination of resistance to intergranular corrosion of HastelloyC-4 and its joint was conducted.Microstructure and composition of welding joint were analyzed by using microhardness,optical metallography,scanning electron microscopy（SEM） and energy dispersive spectrum analysis（EDS）.The results show that the average of intergranular corrosion velocity of joint samples is smaller than that of base alloy samples.With filler wire including higher Cr component,Cr component of weld metal grain boundary is higher than that of base alloy.And with appropriate energy input,follow pass welding offers solution treatment to former weld metal.Both of them improve resistance property to intergranular corrosion of HastelloyC-4 arc welding joint in oxidizing media.

关 键 词：HastelloyC-4 晶间腐蚀 焊接接头 固溶处理 

分 类 号：TG401[金属学及工艺—焊接]