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Development of a hot stamped channel section with axially tailored properties – experiments and models

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Abstract

In this work, the in-die heating (IDH) tailored hot stamping (THS) process is considered, in which the forming tool is partitioned into zones that are either cooled or heated. Four configurations of THS rails were formed: a non-tailored configuration using conventional room temperature tooling and three tailored configurations in which one-half of the rail was formed in tooling that was heated at different temperatures (in the range 400–700 °C). Micro-hardness measurements confirmed that THS can be used to form an axial crush member that contains tailored properties along its length. The as-formed parts exhibited a Vickers hardness of 430–484 HV in zones formed in cooled tooling, 235–280 HV in zones formed in tooling that was heated to 400 °C and 190–215 HV in zones that were formed when the die set was heated to 700 °C. Numerical models of the THS process were developed using the Åkerström material model in LS-Dyna. As part of the modelling, the activation energies for each phase were calibrated using an LS-OPT routine. The resulting hardness predictions were compared with experimental data to assess the accuracy of the LS-OPT routine. The predicted hardness distributions in the components were quite accurate (usually within 10%, but as high as 16% in some cases).

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Authors and Affiliations

  1. University of Waterloo, 200 University Ave W, Waterloo, ON, Canada

    Kaab Omer, Ryan George & Michael Worswick

  2. University of Guelph, 50 Stone Rd E, Guelph, ON, Canada

    Alexander Bardelcik

  3. Honda R&D Americas, 200 University Ave W, Waterloo, ON, Canada

    Skye Malcolm & Duane Detwiler

Authors
  1. Kaab Omer
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  2. Ryan George
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  3. Alexander Bardelcik
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  4. Michael Worswick
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  5. Skye Malcolm
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  6. Duane Detwiler
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Correspondence to Kaab Omer.

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Funding

This study was funded by Honda R&D Americas, Promatek Research Center (Cosma International), ArcelorMittal, Automotive Partnership Canada, the Natural Sciences and Engineering Research Council, the Ontario Research Fund and the Canada Research Chair Secretariat. Support for this research from all of these parties is gratefully acknowledged.

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The authors declare that they have no conflict of interest.

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Omer, K., George, R., Bardelcik, A. et al. Development of a hot stamped channel section with axially tailored properties – experiments and models. Int J Mater Form 11, 149–164 (2018). https://doi.org/10.1007/s12289-017-1338-7

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  • DOI: https://doi.org/10.1007/s12289-017-1338-7

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