Influence of rotation speed on mechanical properties and corrosion sensitivity of friction stir welded AA2024‐T3 joints
Influence of rotation speed on mechanical properties and corrosion sensitivity of friction stir welded AA2024‐T3 joints
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DOI：
10.1002/maco.201709960
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发表时间：
2018-08
期刊：
影响因子：
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通讯作者：
Na Li;Wenya Li;Yaxin Xu;Xiawei Yang;N. Alexopoulos
中科院分区：
文献类型：
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作者：
Na Li;Wenya Li;Yaxin Xu;Xiawei Yang;N. Alexopoulos
对2024‐T3铝合金搅拌摩擦焊（fswwed）接头在固定运动速度为200 mm/min时不同转速下的性能进行了研究。明确研究了转速对焊接接头硬度、拉伸力学性能和腐蚀敏感性的影响。结果表明，转速对搅拌区的形状和几何形状有显著影响。接头的显微组织发生了变化，显微硬度随工艺转速的增加而增加。这是由于在高转速下形成了高体积分数的GPB带。在600转/分的转速下，获得了强度与延性折衷的最佳值。适当的晶粒尺寸、析出相密度和尺寸支持了这一点，从而使合金的极限抗拉强度约为420 MPa，断口伸长率约为8.7%。这种焊接接头也表现出最低的腐蚀敏感性，而热影响区比相应的搅拌摩擦区更耐腐蚀。
A study of aluminum alloy 2024‐T3 friction stir welded (FSWed) joints under different rotation speeds at fixed travel speed of 200 mm/min is summarized. The effect of rotation speed on the hardness, tensile mechanical properties as well as corrosion sensitivity of the welded joints was explicitly investigated. The results show that the rotation speed has a remarkable influence on the shape and geometry of the stirred zone. Microstructure of the joint varied, while it was shown that microhardness was increased as the rotation speed of the process increased. This was attributed to the formation of high volume fraction of GPB zones under high rotation speed. An optimal in the strength to ductility compromise was obtained for the 600 rpm rotation speed. This was supported by the appropriate grain size and precipitates density and size, resulting in ultimate tensile strength of approximate 420 MPa and elongation at fracture of approximate 8.7%. This welded joint also exhibited the lowest corrosion susceptibility, while the heat‐affected zone proved to be more corrosion resistant than the respective friction stir zone.