多道埋弧堆焊组织及性能研究  

Research on Microstructure and Properties of Multi-Pass Submerged Arc Welding Condition

作　　者：何晓峰[1] 卢庆华[1] 彭必荣 陈轩[1] 张静[1] 

机构地区：[1]上海工程技术大学材料工程学院,上海201620

出　　处：《上海工程技术大学学报》2015年第3期258-261,共4页Journal of Shanghai University of Engineering Science

基　　金：国家自然科学基金资助项目(51305253)

摘　　要：在16Mn钢厚板上用多道埋弧焊堆焊一层金属,研究不同焊道之间的热作用对热影响区、焊缝显微组织及显微硬度的影响.结果表明:单道和多道埋弧焊的热影响区都由不完全正火区、正火区和过热区构成.焊缝区组织主要为柱状晶,晶界处为片状先共析铁素体.多道埋弧焊中,受"后热"的焊缝的晶粒有所长大,而受"预热"的焊缝的柱状晶生长受阻并有等轴晶生成.此外,焊缝的显微硬度值取决于不同焊道之间相互热作用及冷却速率.Submerged arc welding was used to overlay a metal layer on the surface of 16 Mn thick plate,and the influence of thermal action on the heat affected zone（ HAZ）,microsturcture in welding bead and microhardness were discussed. The results show that HAZ is composed by incomplete normalized zone,normalized zone and overheated zone either in single-pass welding or multi-pass welding. The welding beads are mainly composed with columnar crystal,and proeutectoid ferrite can be observed at grain boundaries. In multi-pass welding,grain size with postheating condition is increasing,the growth of columnar crystal is impeded and isometric crysytal is promoted with reheating condition. Additionally,the microhardness of welding bead is mainly depending on thermal effection and cooling speed.

关 键 词：多道埋弧焊 金相组织 显微硬度 

分 类 号：TG445[金属学及工艺—焊接]