6061铝合金搅拌摩擦焊接头性能研究  

Study on Properties of 6061 Alloy Friction Stir Welded Joint

作　　者：王永景[1] 陈文静[1] 许莉[1] 刘岳[2] 

机构地区：[1]西华大学材料科学与工程学院,四川成都610039 [2]西南交通大学材料科学与工程学院,四川成都610031

出　　处：《热加工工艺》2014年第17期179-181,184,共4页Hot Working Technology

基　　金：四川省教育厅科研项目(11ZA006)

摘　　要：采用搅拌摩擦焊对6 mm厚6061-T6铝合金板在不同工艺参数下进行焊接。观察了接头的显微组织,研究了接头室温拉伸性能及晶间腐蚀性能,测试了接头腐蚀前后的显微硬度。结果表明:在搅拌头转速900r/min、焊接速度100 mm/min、焊后缓冷工艺下,可得到性能较好的接头,其抗拉强度可达到母材的74%。接头显微硬度呈现"W"型分布,存在明显的软化区,母材的硬度最高,热影响区的硬度最低。晶间腐蚀最严重的部位发生在焊核区,经腐蚀后接头硬度显著下降。6061-T6 aluminum alloy plates with thickness of 6 mm were welded by friction stir welding （FSW） in differentparameters. The microstructure of the welded joint was observed. The tensile properties at room temperature and intergranularcorrosion of the welded joints were studied. The microhardness of the joints before and after corrosion was measured. Theresults show that high quality with 74 % strength of the base material welds can be gotten at travel speed of 100 mm/min androtation speed of 900 r/min and by slow cooling after welding. The microhardness of the welded joint distributes like ＂W＂-type with a clear softening zone, and the highest hardness in the base metal while the lowest hardness can be found in theheat-affected zone with the worst mechanical property. The most serious intergranular corrosion occurs in the part of weldnugget zone and the hardness of the welded joint drops obviously after corrosion.

关 键 词：6061-T6铝合金 搅拌摩擦焊 力学性能 晶间腐蚀性能 显微硬度 

分 类 号：TG457.14[金属学及工艺—焊接]