Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Enhancement of formability of aluminum alloys in multi-stage forming operations by a local intermediate heat treatment

Project Status: finished

Goal of the research project is the enhancement of the formability of precipitation hardenable aluminium alloys by local laser assisted short term heat treatment in multistage forming operations. Key idea of the technology is the local adaption of the mechanical properties after a first forming step and their optimization for the subsequent forming operation. The partial change of the mechanical properties is obtained by a short term heat treatment. Based on the new property distribution the material flow during the second forming is improved and the formability of the material can be enhanced. The work covers all necessary steps for a successful application of the technology. After a material characterization in dependency of the pre-straining and the heat treatment, the heat affected zone (HAZ), which is a result of the high heat conductivity of aluminum alloys will be analyzed. In the end appropriate heat treatment layouts were designed via numerical simulation. The enhancement of the formability was demonstrated with a real multi-stage forming process.


Research Groups



    • Merklein, M.; Hofmann, M.; Lechner, M.; Kuppert, A.:
      A Review on Tailored Blanks - Production, Applications and Evaluation.
      J. Mater. Process. Tech. 214(2014)2, pp. 151-164


    • Merklein, M.; Lechner, M.:
      Manufacturing flexibilisation of metal forming components by tailored blanks.
      In: D. Dimitrov; C. Schutte (Edtrs.): Proc. Conf. Competitive Manufacturing, 2013, pp. 165-170

    • Merklein, M.; Hagenah, H.; Lechner, M.; Kuppert, A.:
      Simulationsgestützte Auslegung maßgeschneiderter wärmebehandelter Aluminiumhalbzeuge.
      In: Tekkaya A. E.; Liewald M. (Edtrs.): 16. Workshop Simulation in der Umformtechnik, Institut für Umformtechnik und Leichtbau, Technische Universität Dortmund, 2013, pp. 90-101

    • Lechner, M.; Böhm, W.; Nguyen, H.; Merklein, M.:
      Herstellung maßgeschneiderter Aluminiumwerkstoffe.
      Zeitschrift Konstruktion 11/12(2013), pp. 11-13


    • Merklein, M.; Böhm, W.; Lechner, M.:
      Tailoring material properties of aluminum by local laser heat treatment.
      Physics Procedia 39(2012), pp. 232–239

    • Merklein, M.; Lechner, M.; Kuppert, A.:
      Enhancement of formability of aluminum alloys in multi-stage forming operations by a local intermediate heat treatment.
      Prod. Eng. Res. Dev. 6(2012)6, pp. 541-549

    Letztes Update: 17.04.2014