焊后热处理对6061铝合金焊接接头微观组织与力学性能的影响
Effects of Post-weld Heat Treatment on Microstructures and Mechanical Properties of Aluminum Alloy 6061 Welded Joints
谢业东， 农 琪
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作者单位：(广西工业职业技术学院 汽车工程系， 广西 南宁 530001)
中文关键字： 铝合金； 软化； 焊后热处理； 强化相
英文关键字：aluminum alloy; soften; post-weld heat treatment; strengthen precipitates
中文摘要：通过金相技术、力学性能试验和SEM技术，研究了固溶+时效热处理对6061铝合金焊接接头微观组织和力学性能的影响。结果表明，热处理前焊接接头两侧热影响区内有一对对称分布的软化区，其原因是由于焊接热输入的影响使该部位发生了过时效。固溶处理 + 人工时效热处理后，焊缝和热影响软化区析出较多的强化相(Mg2Si)，焊接接头硬度和拉伸性能明显提高。
英文摘要：The effect of solid solution and artificial ageing treatment on the microstructures and mechanical properties of aluminum alloy 6061 welded joint was researched by metallographic, mechanical test and SEM technology. The results show that there is a pair of soft zone located symmetrically on both heat-affected zones(HAZs) of welded joint without post-weld heat treatment. The occurrence of soft zone is due to over-aging caused by heat input during welding. More strengthen precipitates (Mg2Si) emerged in both metal and soft HAZs of welded joint with solid solution and artificial aging treatment, which can obviously increase the hardness and tensile properties of the welded joints.