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Influence of Hot Deformation on Mechanical Properties and Microstructure of a Twin-Roll Cast Aluminium Alloy EN AW-6082

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Abstract

Thin strips of medium- and high-strength age-hardening aluminium alloys are widely used in the automotive industry. Reducing their production costs caused by high energy consumption is an actual challenge. The implementation of the twin-roll casting technology is promising. However, mechanical properties of directly cast high-alloyed thin aluminium strips are oftentimes inadequate to standard specifications. In this work, the influence of a hot deformation following a twin-roll cast strip process on the mechanical properties and microstructure is investigated. For this study strips of age-hardening aluminium alloy EN AW-6082—manufactured at a laboratory scaled twin-roll caster—were single-pass rolled at temperatures of 420 °C and true strains of up to 0.5. The mechanical properties of the as-cast and by different strains hot deformed material in the soft-annealed and age-hardened states were characterized by tensile tests. The results reveal that the twin-roll cast material features the necessary strength properties, though it does not meet the standard requirements for ductility. Furthermore, the required minimum strain during hot rolling that is necessary to ascertain the standard specifications has been determined. Based on micrographs, the uniformity of the mechanical properties and of the microstructure as a result of recrystallization due to hot metal forming and heat treatment were determined. A fine-grain microstructure and satisfactory material ductility after prior rolling with a true strain above 0.41 for the age-hardened state T6 and above 0.1 for the soft-annealed state O have been established.

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Acknowledgments

The authors would like to thank the Federal Ministry of Education and Research (BMBF) as well as the Ministry of Education, Science, Youth and Sport of Ukraine for their financial support for the international cooperative scientific work carried out within the scope of the project 01DK12032.

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Authors and Affiliations

  1. Leibniz Universität Hannover, Institut für Werkstoffkunde, Garbsen, Germany

    O. Grydin & F. Nürnberger

  2. National Metallurgical Academy of Ukraine, Dnipropetrovsk, Ukraine

    M. Stolbchenko

  3. Universität Paderborn, Paderborn, Germany

    M. Schaper

Authors
  1. O. Grydin
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  2. M. Stolbchenko
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  3. F. Nürnberger
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  4. M. Schaper
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Correspondence to F. Nürnberger.

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Grydin, O., Stolbchenko, M., Nürnberger, F. et al. Influence of Hot Deformation on Mechanical Properties and Microstructure of a Twin-Roll Cast Aluminium Alloy EN AW-6082. J. of Materi Eng and Perform 23, 937–943 (2014). https://doi.org/10.1007/s11665-013-0816-4

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  • DOI: https://doi.org/10.1007/s11665-013-0816-4

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