Investigations on Microstructural Evolutions and Mechanical Properties of Dual-Phase 600 Steel and AA6082-T6 Aluminum Alloy Dissimilar Joints Fabricated by Friction Stir Welding
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In this research work, dual-phase 600 steel grade and AA6082-T6 aluminum alloy dissimilar flat plates of thickness 2 mm were fabricated by using friction stir welding. Three tool rotational speeds of 560, 710 and 900 rpm, three tool traverse speeds of 24, 32 and 40 mm/min, three tool offsets of 0.8, 1.3 and 1.8 mm and constant tool tilt angle of 0.5° were used to obtain the defect-free welds. Macrostructure, microstructure evolutions, tensile strength, microhardness tests were carried out to assess the welding properties of dissimilar steel and aluminum welded joints. The highest tensile strength of 240 MPa with the joint efficiency of 85% of the base metal was obtained when the parameters were set to tool rotational speed of 710 rpm, traverse speed of 40 mm/min, tool tilt angle of 0.5° and tool pin offset of 1.3 mm using a tungsten carbide tool. The highest microhardness of 246 HV was obtained in the stir zone. Scanning electron microscopy was used to study the joint interface structure. The presence of Fe5Al8 and FeAl intermetallic compounds was confirmed by energy-dispersive X-ray and X-ray diffraction analysis.
KeywordsFriction stir welding Dual-phase 600 steel Aluminum alloy Microstructure Tensile strength
Mr. Sameer MD, Research Scholar (Enrollment No. 16407002) under the guidance of Dr. Anil Kumar Birru, Assistant professor in Department of Mechanical Engineering, NIT Manipur, would also like to acknowledge the cooperation of Mr. Subhabrata Mukherjee, SSAB Europe, for his staunch support and providing dual-phase steel material and Fr. Rev Augustine Reddy Director, CJITS, for his support in carrying this research work.
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