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Process Integrated Heat Treatment of a Microalloyed Medium Carbon Steel: Microstructure and Mechanical Properties

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Abstract

Air-water spray cooling was employed during a heat treatment to enhance the mechanical properties of microalloyed medium carbon steel test cylinders (38MnVS6, 88 mm diameter). Using appropriate cooling times and intensities, the test cylinders’ surfaces could be quenched and subsequently self-tempered by the residual heat of the core. Simultaneously, it was possible to keep the core regions of the cylinders in the bainitic regime and carry out a quasi-isothermal holding. The resulting microstructures consisted of tempered martensite (near-surface) and bainite with pearlite and ferrite (core). Compared to the standard heat treatment (controlled air cooling), the tensile properties (proof stress and ultimate tensile strength) could be improved for both near-surface and core regions with the adapted spray cooling. A hardness profile with 450 HV10 surface hardness and a hardening depth of more than 11 mm could be realized. In addition, an increase of the impact toughness for the core was achieved, resulting in approximately 25 J charpy impact energy. This is a substantial improvement compared to standard heat treatment procedure and values reported in the literature and can be attributed to the reduced pearlite volume fraction and the increased amount of fine bainite.

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Acknowledgments

The authors thank the German Research Foundation (DFG) for financial support within the Project NU297/2-1 and the Institut für Umformtechnik und Umformmaschinen (IFUM) of the Leibniz Universität Hannover for supplying the material.

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Authors and Affiliations

  1. Institut für Werkstoffkunde (Materials Science), Leibniz Universität Hannover, An der Universität 2, 30823, Garbsen, Germany

    Sebastian Herbst, Mareike Schledorn, Hans Jürgen Maier & Florian Nürnberger

  2. Zentrum für Festkörperchemie und Neue Materialien, Leibniz Universität Hannover, Callinstr. 9, 30167, Hannover, Germany

    Hans Jürgen Maier & Florian Nürnberger

  3. AGH University of Science and Technology, Mickiewicza 30, 30-059, Kraków, Poland

    Andrij Milenin

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  1. Sebastian Herbst
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  2. Mareike Schledorn
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  5. Florian Nürnberger
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Correspondence to Sebastian Herbst.

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Herbst, S., Schledorn, M., Maier, H.J. et al. Process Integrated Heat Treatment of a Microalloyed Medium Carbon Steel: Microstructure and Mechanical Properties. J. of Materi Eng and Perform 25, 1453–1462 (2016). https://doi.org/10.1007/s11665-016-2004-9

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  • DOI: https://doi.org/10.1007/s11665-016-2004-9

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