Enhancement of mechanical properties and corrosion resistance of friction stir welded joint of {AA2014} using water cooling

By Sinhmar, S.; Dwivedi, D. K.
Published in Materials Science and Engineering: A NULL 2017

Abstract

Abstract 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.

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