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Local Laser Heat Treatment in Dual-Phase Steels

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Abstract

This research deals with processes leading to local strengthening effects in hot-rolled dual-phase (DP) steels. For this purpose, a method was investigated to achieve local strengthening, namely, local laser heat treatment (LHT). DP sheet steels were globally and homogenously deformed with different degrees of prestrains by cold rolling and subsequently locally heat treated by laser. Following this treatment with selected parameters, the microstructure of the surface and cross section of the heat-treated area as well as the mechanical properties were evaluated by light optical microscopy (LOM), scanning electron microscopy (SEM), as well as transmission electron microscopy (TEM), hardness measurement, and tensile testing. It can be stated that with partial heat treatment, local high strengthening can be produced. At lower heat treating temperatures, this effect could be attributed to bake hardening (BH). Increasing the prestrain as well as temperature results in improving the local properties. With increased heat treating temperature, the initial microstructure near the surface is affected. Partial strengthening of DP steels by laser can open up new fields of application for locally using the strengthening effect to only influence relevant areas of interest, thus providing the potential for saving energy and designed the component’s behavior.

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  2. INSTRON is a trademark of Instron, Canton, MA.

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Acknowledgments

This article is dedicated to the soul of Professor Georg Frommeyer, the retired alumnus research group leader of “MPIE GmbH.” The achievement of this article was a result of his wide ranging knowledge and support. Additionally, the authors thank the DFG “Deutsche Forschungsgemeinschaft” (Bonn, Germany) for their financial support of the project as part of the collaborative research center SFB 675 “Creation of high strength metallic structures and joints by setting up scaled local material properties.” The authors are also grateful to ThyssenKrupp Steel AG for providing the steels.

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Author notes

  1. Mehdi Asadi (Project Manager)

    Present address: Roll Forming,“ Benteler Automobiltechnik GmbH, Paderborn, Germany

Authors and Affiliations

  1. IMET Institute of Metallurgy, Clausthal Univeristy of Technology, Clausthal-Zellerfeld, Germany

    Mehdi Asadi (Project Manager) & Heinz Palkowski (Professor and Chair of Metal Forming and Processing)

  2. Max-Planck-Institut für Eisenforschung (MPIE), Duesseldorf, Germany

    Georg Frommeyer (Senior Manager)

  3. Institut für Werkstoffe, Ruhr Universität Bochum, Bochum, Germany

    Ali Aghajani (Assistant)

  4. Center for Material and Fibre Innovation/Science and Technology, Deakin University, Geelong Campus, VIC, 3217, Australia

    Ilana Timokhina (Researcher)

Authors
  1. Mehdi Asadi
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  2. Georg Frommeyer
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  3. Ali Aghajani
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  5. Heinz Palkowski
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Corresponding author

Correspondence to Heinz Palkowski.

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Manuscript submitted April 21, 2010.

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Asadi, M., Frommeyer, G., Aghajani, A. et al. Local Laser Heat Treatment in Dual-Phase Steels. Metall Mater Trans A 43, 1244–1258 (2012). https://doi.org/10.1007/s11661-011-0943-1

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