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A Study on the Microstructure, Mechanical Properties, and Corrosion Behavior for Friction Stir Welded Ti-6Al-4V Alloys

Quoc-Manh Nguyen 1, The-Vinh Do 2, and Van-Nhat Nguyen 1
1. Faculty of Mechanical Engineering, Hung Yen University of Technology and Education, Hung Yen, Vietnam
2. Faculty of Mechanical Engineering, Thai Nguyen University of Technology, Thai Nguyen city, Vietnam

Abstract—Friction stir welding is an emerging severe plastic deformation technology and has been used to produce a butt-joint on Ti-6Al-4V alloys sheet with a thickness of 2.5mm at rotation speeds of (1500 and 2000 rpm) and a constant travel speed of 200 mm/min. The effect of welding and rotation speeds on microstructure, tensile strength, and corrosion resistance property has been investigated. Micro-structural study of welded joint specimens has been performed by scanning electron microscopy for both stir zone and thermo-mechanically affected zone. Tensile property and micro-hardness studies have been done to identify the joint strength. Micro-structure correlates with the mechanical property. XRD has been investigated to distinguish between α and β phases. Finally, the EBSD has been conducted to identify the recrystallization phenomenon in the stir zone. A corrosion study has been performed for friction stir welded joints in Ringer’s solution which is equivalent to body fluid solution. Finally, the Tafel plot analysis has been employed to determine the corrosion rate for SZ and TMAZ. We found 96% of joint strength achieved for friction stir welded joint than the base metal. This study promises applications not only in the welding industry but also in other fields of engineering technologies and our practical life.

Index Terms— Friction Stir Welding (FSW), Ti-6Al-4V alloys, Stir Zone (SZ), Thermo-Mechanically Affected Zone (TMAZ), tensile strength

Cite: Quoc-Manh Nguyen, The-Vinh Do, and Van-Nhat Nguyen, "A Study on the Microstructure, Mechanical Properties, and Corrosion Behavior for Friction Stir Welded Ti-6Al-4V Alloys," International Journal of Mechanical Engineering and Robotics Research, Vol. 10, No. 3, pp. 163-168, March 2021. DOI: 10.18178/ijmerr.10.3.163-168

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