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Influence of Short Austenitization Treatments on the Mechanical Properties of Low-Alloy Steels for Hot Forming Applications

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Abstract

The current work elucidates an improvement of the mechanical properties of tool-quenched low-alloy steel by employing extremely short austenitization durations utilizing a press heating arrangement. Specifically, the influence of different austenitization treatments—involving austenitization durations ranging from three to 15 seconds—on the mechanical properties of low-alloy steel in comparison to an industrial standard furnace process was examined. A thorough set of experiments was conducted to investigate the role of different austenitization durations and temperatures on the resulting mechanical properties such as hardness, bending angle, tensile strength, and strain at fracture. The most important finding is that the hardness, the bending angle as well as the tensile strength increase with shortened austenitization durations. Furthermore, the ductility of the steels exhibits almost no difference following the short austenitization durations and the standard furnace process. The enhancement of the mechanical properties imposed by the short heat treatments investigated, is related to a refinement of microstructural features as compared to the standard furnace process.

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Acknowledgments

Financial support by Deutsche Forschungsgemeinschaft within the Transregional Collaborative Research Center TRR 30 “Prozessintegrierte Herstellung funktional gradierter Strukturen auf der Grundlage thermo-mechanisch gekoppelter Phänomene” and the help of Felix Hegemann with the experiments are gratefully acknowledged.

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Authors and Affiliations

  1. Lehrstuhl für Werkstoffkunde (Materials Science), University of Paderborn, 33095, Paderborn, Germany

    Martin Joachim Holzweissig (Group Leader) & Mirko Schaper (Professor)

  2. Research and Development, Benteler Automotive, 33102, Paderborn, Germany

    Jan Lackmann (Research Engineer) & Stefan Konrad (Research Engineer)

  3. Institute of Materials Engineering, Technische Universität Bergakademie Freiberg, 09599, Freiberg, Germany

    Thomas Niendorf (Emmy-Noether Group Leader)

Authors
  1. Martin Joachim Holzweissig
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  2. Jan Lackmann
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  3. Stefan Konrad
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  4. Mirko Schaper
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  5. Thomas Niendorf
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Correspondence to Martin Joachim Holzweissig.

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Manuscript submitted January 5, 2014.

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Holzweissig, M.J., Lackmann, J., Konrad, S. et al. Influence of Short Austenitization Treatments on the Mechanical Properties of Low-Alloy Steels for Hot Forming Applications. Metall Mater Trans A 46, 3199–3207 (2015). https://doi.org/10.1007/s11661-015-2907-3

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