Enhancement of mechanical properties and corrosion resistance of friction stir welded joint of AA2014 using water cooling
Enhancement of mechanical properties and corrosion resistance of friction stir welded joint of AA2014 using water cooling
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DOI：
10.1016/j.msea.2016.12.087
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发表时间：
2017-01
期刊：
影响因子：
6.4
通讯作者：
S. Sinhmar;D. K. Dwivedi
中科院分区：
文献类型：
--
作者：
S. Sinhmar;D. K. Dwivedi
研究了AA 2014钢搅拌摩擦焊接头在自然冷却（NC）和水冷（WC）条件下的显微组织、力学性能和腐蚀行为。采用光学显微镜、场发射扫描电镜（FESEM）、能谱仪（EDS）、维氏显微硬度、拉伸试验、X射线衍射（XRD）和电化学动电位极化腐蚀试验（Tafel曲线）对两种冷却条件下的搅拌摩擦焊接头进行了表征。与自然冷却相比，水冷搅拌摩擦焊接头的强度和显微硬度均有所提高。采用水冷方式减小了搅拌摩擦焊热影响区的宽度，使最低硬度区向焊缝中心移动。腐蚀试验在3.5%NaCl溶液中进行。水冷接头的耐蚀性高于自然冷却接头。焊核和热影响区的析出行为对2014铝合金搅拌摩擦焊接头的耐蚀性有影响。从显微组织角度讨论了NC和WC搅拌摩擦焊接头的硬度、拉伸性能和腐蚀性能。
An investigation on the microstructure, mechanical properties, and corrosion behavior of friction stir welded joint of AA2014 in natural cooled (NC) and water cooled (WC) conditions have been reported. Optical microscopy, field emission scanning electron microscopy (FESEM) with Energy dispersive X-ray spectroscopy (EDS), Vicker's microhardness, tensile testing, X-ray diffraction (XRD), and electrochemical potentiodynamic polarization corrosion test (Tafel curve) were carried out to characterize the friction stir weld joints in both the cooling conditions. Water cooling resulted in higher strength and microhardness of friction stir weld joint compared to the natural cooling. The width of heat affected zone was reduced by the use of water cooling during friction stir welding (FSW) and minimum hardness zone was shifted towards weld center. The corrosion test was performed in 3.5% NaCl solution. Corrosion resistance of water cooled joint was found higher than natural cooled FSW joint. The precipitation behavior of weld nugget and heat affected zone impacts the corrosion resistance of FSW joint of AA 2014. Hardness, tensile, and corrosion properties of FSW joints produced under NC and WC conditions have been discussed in the light of microstructure.