Fe-6.5% Si合金热轧板焊接接头的组织和力学性能  

Microstructure and Mechanical Properties of Welding Joints of Fe-6.5% Si Alloy Hot Bands

作　　者：柳金龙[1] 沙玉辉[1] 温秀秀 左良[1] 

机构地区：[1]东北大学材料各向异性与织构教育部重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2016年第1期39-43,共5页Journal of Northeastern University(Natural Science)

基　　金：国家高技术研究发展计划项目(2012AA03A505);国家自然科学基金资助项目(51171042);中央高校基本科研业务费专项资金资助项目(N120410002);辽宁省博士科研启动基金资助项目(20121008)

摘　　要：针对Fe-6.5% Si合金热轧板焊接接头易萌生裂纹的问题,研究了不同氩弧焊工艺对焊接接头显微组织和力学性能的影响规律.研究表明:不使用填充焊丝的TIG焊不适合Fe-6.5% Si合金热轧板焊接,因在焊缝内出现大量显微裂纹;使用工业纯铁焊丝的MIG焊实现了Fe-6.5% Si合金热轧板的良好连接,焊缝表面连续、鱼鳞纹均匀,焊缝内无显微裂纹.稀释硅浓度是改善焊缝区组织和力性的有效方法.优化工艺下的焊接接头在500℃拉伸延伸率5.5%,抗拉强度280 MPa,满足Fe-6.5%Si合金板带制造过程中的温轧工艺要求.To solve the problem that welding joint is easy to crack in hot bands of Fe-6.5% Si alloy, the effect of argon arc welding process on the microstructure and mechanical properties of joints was investigated. The results showed that TIG welding without filler wire is not suitable for the welding of Fe-6.5% Si alloy hot bands because it produces a large number of cracks in the weld. While MIG welding using the electrodes made of industrial pure iron successfully connects the hot bands. The weld is continuous in the surface, the fish-scale pattern is uniform and no micro-cracks are in the weld. The optimization of microstructure and plasticity can be attributed to the dilution of silicon concentration in the weld zone. After the optimization of welding process, the tensile elongation and the ultimate tensile strength of the joint are 5.5% and 280 MPa, respectively, which can meet the requirement of warm rolling process of Fe-6. 5% Si alloy.

关 键 词：Fe-6.5%Si 焊接 组织 性能 MIG 

分 类 号：TG115.62[金属学及工艺—物理冶金]