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Pre-deformation effect on the hot deformation behavior and microstructure of AA6011 tube: experimentation and modelling

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Abstract

Hot gas forming (HGF) is an advanced technique for fabricating complex-shaped hollow tubular parts. Practically, multi-step pre-forming involving pre-deformation is often necessary prior to HGF. This paper performs an experimental investigation to simulate the pre-forming operation evaluating the effect of pre-strain on the subsequent HGF. Firstly, the dislocation density was accumulated with uniaxial pre-stretching with different strains (5%, 10%, and 15%) at room temperature, simulating the pre-forming operations. Secondly, the sub-sized specimen from the pre-stretched sample was characterized at different temperatures (350, 400, and 450 °C) to evaluate the effect of pre-strain on successive hot deformation for simulating practical HGF. The experimental results proves the coupled influence of pre-strain and temperature on the flow stress and stress-strain variations. To thoroughly understand the micro-mechanisms, EBSD analysis of grains and grain boundary angles was carried out under different pre-deformation levels and temperatures, which shows the recrystallization phenomenon at 15% pre-strain and 450 °C temperature. Finally, a physical mechanism constitutive model is established based on the determined macro and micro results where the pre-strain effect shows the accurate modeling of stress flow behavior of the material.

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Funding

The authors received funding support from the National Natural Science Foundation of China (Grant No. 5200052525) and the Fundamental Research Funds for the Central Universities under the Grant Agreement DUT20RC(3)012 .

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Authors and Affiliations

  1. School of Mechanical Engineering, Dalian University of Technology, Dalian, 116024, China

    Zhennan Bao, Shuguang Qu, Jiayu Liang, Kailun Zheng & Zhubin He

  2. School of Material Science and Engineering, Harbin Institute of Technology, Harbin, 15001, China

    Song Yang & Kunning Fu

  3. State Key Laboratory of High-Performance Precision Manufacturing, Dalian University of Technology, Dalian, 116024, China

    Kailun Zheng & Zhubin He

Authors
  1. Zhennan Bao
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  2. Shuguang Qu
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  6. Kunning Fu
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Contributions

Zhennan Bao: conceptualization, methodology and writing — original draft preparation. Shuguang Qu: writing—reviewing, editing and formal analysis. Jiayu Liang: formal analysis. Song Yang: writing — reviewing and Editing. Kailun Zheng: conceptualization, validation and funding acquisition. Kunning Fu: experimental scheme design. Zhubin He: supervision.

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Correspondence to Kunning Fu.

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Bao, Z., Qu, S., Liang, J. et al. Pre-deformation effect on the hot deformation behavior and microstructure of AA6011 tube: experimentation and modelling. Int J Adv Manuf Technol 128, 2395–2406 (2023). https://doi.org/10.1007/s00170-023-12036-2

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