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Heat treatment and granule medium internal high-pressure forming of AA6061 tube

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Abstract

The new forming process of AA6061 alloy tube, including solution treatment, granule medium internal high-pressure forming and aging treatment, was developed. The AA6061 alloy tube via heat treatment satisfied the forming requirement, and the granule medium internal high pressure forming method for AA6061 alloy tube was also realized by using convenient implementation with low requirement of equipment and flexible design of product. At a solution temperature of 560°C and time of 120 min, the elongation of the AA6061 extruded tube increases by 300% and the strength and the hardness dramatically decrease too. Therefore, the AA6061 alloy tube meets the requirement of internal high-pressure forming because of the improvement of formability. The experiments shows that the strength and hardness of AA6061 alloy workpiece recover to that of the as-received alloy at an aging temperature of 180°C and time of 360 min, and the strength of AA6061 alloy workpiece is equal to the base alloy. The typical parts of convex ring tube, stepped shaft tube and hexagonal tube were successfully produced in lab by using the present forming method. The forming tests show that the maximum expansion ratio (MER) of the AA6061 extruded tube increases by 25.5% and the material properties of formed AA6061 alloy tube reached the performance of as-received alloy.

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Authors and Affiliations

  1. Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education of China, Yanshan University, Qinhuangdao, 066004, China

    Jiang Bi  (毕江), Chang-cai Zhao  (赵长财), Meng-meng Bi  (毕蒙蒙), Bing Du  (杜冰) & Xiao-hua Chen  (陈晓华)

  2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China

    Jiang Bi  (毕江)

  3. College of Vehicles and Energy, Yanshan University, Qinhuangdao, 066004, China

    Guo-jiang Dong  (董国疆)

Authors
  1. Jiang Bi  (毕江)
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  2. Chang-cai Zhao  (赵长财)
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  3. Meng-meng Bi  (毕蒙蒙)
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  4. Bing Du  (杜冰)
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  5. Xiao-hua Chen  (陈晓华)
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  6. Guo-jiang Dong  (董国疆)
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Corresponding author

Correspondence to Guo-jiang Dong  (董国疆).

Additional information

Foundation item: Project(51305386) supported by the National Natural Science Foundation of China; Project(E2013203093) supported by the Natural Science Foundation of Hebei Province, China

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Bi, J., Zhao, Cc., Bi, Mm. et al. Heat treatment and granule medium internal high-pressure forming of AA6061 tube. J. Cent. South Univ. 24, 1040–1049 (2017). https://doi.org/10.1007/s11771-017-3507-8

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  • DOI: https://doi.org/10.1007/s11771-017-3507-8

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