Microstructure and mechanical properties of friction stir welded 6082 AA in as welded and post weld heat treated conditions |
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| Affiliation: | 1. Department of Civil and Environmental Engineering, University of Brasília, SG-12 Building, Darcy Ribeiro Campus, DF, 70.910-900, Brazil;2. Department of Mechanics Engineering, University of Waterloo, 200 University Ave. West, Waterloo, Ontario N2L 3G1, Canada;3. Department of Civil and Environmental Engineering, University of Waterloo, 200 University Ave. West, Waterloo, Ontario N2L 3G1, Canada;1. SEPI, Instituto Politécnico Nacional, ESIME Unidad Ticomán, Av. Ticomán No. 600, Col. San José Ticomán, 07340 Ciudad de Mexico, Mexico;2. Center for Friction Stir Processing, Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203, USA;3. General Motors, Vehicle Engineering Center, Warren, MI 48090, USA;4. Department of Metallurgical Engineering, Instituto Politécnico Nacional, ESIQIE, Apdo. Postal 118-392, 07738 Ciudad de Mexico, Mexico;1. I. K. Gujral Punjab Technical University, Kapurthala, 144603, India;2. Anand College of Engineering and Management, Kapurthala, 144601, India;3. Guru Nanak Dev Engineering College, Ludhiana, 141006, India |
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| Abstract: | Friction stir welding of 6082 AA-T651 was performed using three different combinations of feed rates (90, 140 and 224 mm/min) and tool rotational speeds (850, 1070 and 1350 rpm). Mechanical properties of the weldments were evaluated by hardness measurements on the transverse section and tensile testing, while microstructure evaluation was done by optical microscopy and electron back scattered diffraction (EBSD). Irrespective to welding parameters the dynamically recrystallized grains in the stir zone were measured to be in the range of 2–3 μm for different feeds rates and rotational speeds. A considerable loss in hardness in the stir zone and more severely in the thermo-mechanically affected zone was noted due to dissolution of β′ and β″ second phase particles. A post weld heat treatment (PWHT) of 175 °C for 5 and 12 h was given to the weldments for all welding conditions and the mechanical properties and microstructure were re-evaluated. The hardness and strength were partially recovered and this was attributed to the possible re-precipitation of the β″ precipitates. The grain size barely exhibited a change, whereas the texture displayed a significant diminish in the Goss orientation after PWHT. |
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