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7B04铝合金薄板的搅拌摩擦焊接及接头低温超塑性研究
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-10-26
在转速 1600r/min-焊速 200mm/min、转速 800 r/min-焊速 200mm/min、转速 400 r/min-焊速 400mm/min 三组参数下对 2 mm 厚的退火态 7B04 铝合金薄板进行搅拌摩擦焊接，研究了焊接参数对焊缝质量及微观组织的影响，并分析了焊核区的低温超塑性变形行为。
7B04铝合金薄板的搅拌摩擦焊接及接头低温超塑性研究FRICTION STIR WELDIING AND LOW-TEMPERATURE SUPERPLASTICITY OF 7B04AL SHEET
在转速 1600r/min-焊速 200mm/min、转速 800 r/min-焊速 200mm/min、转速 400 r/min-焊速 400mm/min 三组参数下对 2 mm 厚的退火态 7B04 铝合金薄板进行搅拌摩擦焊接，研究了焊接参数对焊缝质量及微观组织的影响，并分析了焊核区的低温超塑性变形行为。结果表明，通过控制焊接参数，可获得良好的焊接质量，接头强度系数达100%。焊核区发生动态再结晶，生成细小等轴晶，母材晶粒尺寸约为 300 μm，转速为 1600、800 和 400r/min 时对应晶粒尺寸分别为 2、1 和 0.6μm。这种细晶组织有利于焊核区超塑变形，在300 ºC，焊核区在1×10-3和 3×10-4 s-1应变速率下获得了160%~590%的延伸率，在 350 ºC、1×10-3 s-1条件下获得高达790%的最大延伸率，在约 400 ºC时超塑性变形行为消失。
Annealed 7B04 Al sheets in thickness of 2 mm were subjected to friction stir welding (FSW) under three rotation rate-welding speed parameters of 1600 rpm-200 mm/min, 800 rpm-200 mm/min, and 400 rpm-400 mm/min, respectively. The effect of welding parameters on the tensile property and microstructure of the FSW joints were investigated, with more efforts focusing on the low-temperature superplasticity of the nugget zones (NZs). The results showed that FSW joints with high quality could be produced by controlling welding parameters, with a joint strength coefficient of 100% being obtained. Dynamic recrystallization took place in the NZs with fine and equiaxed grains generated. The grain size of the base material was about 300 μm, while it was significantly decreased in the NZs with decreasing the rotation rate: about 2 μm, 1 μm and 0.6 μm for the above three samples, respectively. The fine grain structure of the NZs could facilitate their superplastic deformation. The NZs exhibited superplastic elongations ranged from 160% to 590% at 300 ºC at strain rates of 1×10-3 s-1 and 3×10-4 s-1. The maximum superplasticity of 790% was obtained at 350 ºC at the strain rate of 1×10-3 s-1. The ability to superplastic deformation disappeared in the NZs at 400 ºC.
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