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Effect of Tool Rotational Speed on the Microstructure and Mechanical Properties of Bobbin Tool Friction Stir Welded 6082-T6 Aluminum Alloy

1,2,3,4,*, 1,2 and 3,4
1
Key Laboratory of Automobile Materials, Ministry of Education, Jilin University, Changchun 130025, China
2
School of Materials Science and Engineering, Jilin University, Changchun 130025, China
3
Key Laboratory of Advanced Structural Materials, Ministry of Education, Changchun University of Technology, Changchun 130012, China
4
School of Materials Science and Engineering, Changchun University of Technology, Changchun 130012, China
*
Author to whom correspondence should be addressed.
Metals 2019, 9(8), 894; https://doi.org/10.3390/met9080894
Received: 10 July 2019 / Revised: 4 August 2019 / Accepted: 13 August 2019 / Published: 15 August 2019
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Abstract

Samples of 6082-T6 aluminum alloy were welded by bobbin tool friction stir welding at different rotational speeds. The thermal cycles, microstructure, microhardness, and tensile properties of the specimens were investigated. The results show that the maximum temperature at the joint increases first and then decreases with increasing rotational speed, and the maximum temperature is 509 °C at 1000 r/min. The macromorphology of the cross-section of the joint is rectangular, and an ‘’S” line and gray-white texture can be observed. The stirred zone had much smaller equiaxed recrystallized grains. With increasing welding speed, the average grain size in the stirred zone region decreases. The microhardness distribution of the cross-section of all joints is W-shaped. When the rotational speed increases, the hardness of the heat-affected zone decreases gradually, and the hardness of the stirred zone increases. At 600 r/min, the strength is the lowest. The fracture location is between the stirred zone and the thermomechanically affected zone. When the rotational speed is increased, the fracture location is entirely located in the heat affected zone, and the fracture surface is dimple-like; the strength significantly increases and reaches a maximum at 800 r/min. View Full-Text
Keywords: bobble tool friction stir welding; 6082-T6 aluminum alloy; rotational speed; microstructure; mechanical properties bobble tool friction stir welding; 6082-T6 aluminum alloy; rotational speed; microstructure; mechanical properties
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Li, Y.; Sun, D.; Gong, W. Effect of Tool Rotational Speed on the Microstructure and Mechanical Properties of Bobbin Tool Friction Stir Welded 6082-T6 Aluminum Alloy. Metals 2019, 9, 894.

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