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Application of Combined W-Temper and Cold Forming Technology to High-Strength Aluminum Alloy Automotive Parts

  • Aluminum: Shape Casting and Forming
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Abstract

In this study, a room temperature forming process for high-strength aluminum alloys was investigated. To overcome the low formability of the peak-aged 7075 aluminum alloy (7075-T6) at room temperature, the sheet metal was subjected to solution heat treatment followed by rapid quenching. Mechanical tests, including uniaxial and balanced biaxial tension tests, were performed, and the Nakajima test was conducted to evaluate the formability of the sheet metal. On the basis of the plastic deformation behavior, finite element models including the plastic yielding and strain hardening laws were constructed. The proposed forming process incorporating the W-temper heat treatment was successfully applied to a realistic automotive part, which could not be manufactured by conventional room temperature forming without prior heat treatment. The numerical accuracies among various plasticity models were evaluated from a comparison of the thickness profiles. In addition, the paint-bake process was applied to the automotive component to evaluate the strength recovery.

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Acknowledgements

This work was supported by Research Resettlement Fund for the new faculty of Seoul National University. M.G. Lee appreciates the support. Also, J. Lee appreciate the supports by the Fundamental Research Program of the KIMS (PNK6000) and by the MOTIE & KIAT (No. P0010344). Special thanks are offered in particular to D. Yoo and S. J. Bae of KIMS for their help with conducting the experiments.

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Authors and Affiliations

  1. Materials Deformation Department, Korea Institute of Materials Science, Changwon, 51508, Republic of Korea

    Jinwoo Lee, Hyuk Jong Bong & Daeyong Kim

  2. Materials Processing Innovation Research Division, Korea Institute of Materials Science, Changwon, 51508, Republic of Korea

    Young-Seon Lee

  3. Department of Materials Science and Engineering, RIAM, Seoul National University, Seoul, 08826, Republic of Korea

    Yumi Choi & Myoung-Gyu Lee

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  1. Jinwoo Lee
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  2. Hyuk Jong Bong
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Correspondence to Myoung-Gyu Lee.

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Lee, J., Bong, H.J., Kim, D. et al. Application of Combined W-Temper and Cold Forming Technology to High-Strength Aluminum Alloy Automotive Parts. JOM 71, 4393–4404 (2019). https://doi.org/10.1007/s11837-019-03779-z

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