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Temperature evolution, microstructure, and properties of friction stir welded ultra-thick 6082 aluminum alloy joints

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Abstract

In this study, the temperature evolution, microstructure, and mechanical properties of friction stir welded 80-mm super-thick plate 6082 aluminum alloy were investigated. Combined with numerical simulation and actual measurement, the thermal cycle curve during welding is obtained, and the accuracy of numerical calculation is verified. The numerical model calculating data shows that the peak temperature difference is up to 109 °C along the thickness direction of the weld in weld nugget zone (WNZ). Different degrees of dynamic recrystallization occur in WNZ, resulting in different grain sizes along the thickness direction of the weld. Each zone is subject to different heat cycle temperatures, so the type, number, and size of the precipitated phases are different. The microhardness curves of each layer of welded joints are all W-shaped, and the microhardness distribution between advancing side and retreating side has significant asymmetry. The fracture location of each layer of weld is located in the heat affected zone on the side of thermomechanical affected zone (HAZTMAZ). The surface of the joint has the highest mechanical properties. Fractures in all tensile specimens were ductile fracture.

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Funding

The study was supported by the funding from the Bureau of Science and Technology of Changchun, China, project (17SS024) and the Commission of Development and Reform of Jilin Provincial, China, project (2019C046-7).

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Authors and Affiliations

  1. Key Laboratory of Advanced Structural Materials of the Ministry of Education, Changchun University of Technology, Changchun, 130012, China

    Rui Zhu & Wen-biao Gong

  2. Changchun Railway Vehicles Co Ltd, Changchun, 130062, China

    Heng Cui

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  1. Rui Zhu
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  2. Wen-biao Gong
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  3. Heng Cui
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Correspondence to Wen-biao Gong.

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Zhu, R., Gong, Wb. & Cui, H. Temperature evolution, microstructure, and properties of friction stir welded ultra-thick 6082 aluminum alloy joints. Int J Adv Manuf Technol 108, 331–343 (2020). https://doi.org/10.1007/s00170-020-05422-7

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