Improving the Quality of Dissimilar Al/Steel Butt-Lap Joint via Ultrasonic-Assisted Friction Stir Welding.
Improving the Quality of Dissimilar Al/Steel Butt-Lap Joint via Ultrasonic-Assisted Friction Stir Welding.
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DOI：
10.3390/ma15051741
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发表时间：
2022-02-25
期刊：
影响因子：
--
通讯作者：
Zhang F
中科院分区：
文献类型：
--
作者：
Chen Y;Zhang F
采用超声辅助搅拌摩擦焊(UaFSW)工艺制备了异种AA7075/Q235对接接头，并对其性能进行了系统研究。超声振动的声塑性效应导致材料软化，增强了焊接过程中的材料流动，减少了UaFSW接头熔核区的焊接缺陷体积。在超声波作用下，金属间化合物(IMCs)在熔核区顶部的Al/钢界面上形成一层光滑而薄的金属间化合物(IMCs)层，可能由Al5Fe2和Al13Fe4两相组成。然而，在低温下，超声振动的积极作用减弱，导致熔核区底部IMCs层不连续，形成焊接缺陷。超声振动提高了应变速率和储能，加速了动态再结晶，细化了熔核区的组织。结果表明，UaFSW接头的力学性能优于FSW接头，峰值拉伸载荷/伸长率提高了一倍以上。此外，UaFSW接头沿铝/钢界面沿熔核区失效，断裂模式为韧性和脆性混合。
A dissimilar AA7075/Q235 butt-lap joint was fabricated via ultrasonic-assisted friction stir welding (UaFSW), and the characteristics of the UaFSW joint were investigated systematically. The acoustoplastic effect of the ultrasonic vibration led to the softening of the materials and enhanced the material flow during welding, decreasing the volume of welding defects in the nugget zone of the UaFSW joint. With the help of ultrasonic vibration, a smooth and thin intermetallic compounds (IMCs) layer could generate along the Al/steel interface at the top of nugget zone, which possibly consisted of Al5Fe2 and Al13Fe4 phases. However, the positive effects of the ultrasonic vibration were weakened at low temperatures; consequently, the IMCs layer became discontinuous at the bottom of the nugget zone and the welding defects also formed. The ultrasonic vibration accelerated the dynamic recrystallization and refined the microstructures in the nugget zone due to the increased strain rate and stored energy. As a result, the UaFSW joint exhibited a better mechanical performance in comparison to the FSW joint, and the increment in the peak tensile load/elongation was more than twice. In addition, the UaFSW joint failed in the nugget zone along with the Al/steel interface, and the fracture mode was a mixture of ductile and brittle.
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