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Induction Hardening vs Conventional Hardening of a Heat Treatable Steel

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Abstract

This study focuses on the comparison of mechanical and microstructural properties of induction and conventionally heat-treated steels in the as-quenched state. The investigated steel is a heat treatable 42CrMo4 steel. In order to characterize the mechanical properties, tensile tests and Vickers hardness tests are performed. The yield strength and hardness of the induction hardened condition turn out to be slightly lower compared to the conventionally hardened one. Light optical and scanning electron microscopy show no differences in the martensitic structure of the induction and conventionally hardened condition. However, electron back scatter diffraction investigations reveal a smaller block size within the conventionally hardened specimen. Carbon mappings by electron probe micro analysis show a homogenous carbon concentration in the conventionally hardened and a non-uniform distribution in the induction-hardened case. The segregation of the carbon exhibits line-type features in the induction hardened condition, lowering the total amount of carbon in the matrix. Therefore, the carbon content in the matrix of the conventionally hardened condition is slightly higher, which causes a smaller block size. The smaller block size is believed to be the reason for the higher hardness and yield strength.

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Acknowledgments

The financial support by the Austrian Federal Ministry of Economy, Family and Youth and the National Foundation for Research, Technology and Development is gratefully acknowledged. The authors want to thank Tomasz Wojcik for his help regarding the TEM investigations.

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Authors and Affiliations

  1. Christian Doppler Laboratory Early Stages of Precipitation, Montanuniversitaet Leoben, Franz Josef-Straße 18, 8700, Leoben, Austria

    Stephanie Sackl (Ph.D. student)

  2. Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, Franz Josef-Straße 18, 8700, Leoben, Austria

    Stephanie Sackl (Ph.D. student), Helmut Clemens (Professor) & Sophie Primig (Scientist)

  3. Böhler Edelstahl GmbH & Co KG, Mariazellerstraße 25, 8605, Kapfenberg, Austria

    Harald Leitner (Scientist)

  4. Stahl Judenburg GmbH, Gußstahlwerkstraße 21, 8750, Judenburg, Austria

    Michael Zuber (Employee)

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  1. Stephanie Sackl
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  2. Harald Leitner
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  3. Michael Zuber
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  4. Helmut Clemens
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  5. Sophie Primig
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Corresponding author

Correspondence to Stephanie Sackl.

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Manuscript submitted March 3, 2014.

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Sackl, S., Leitner, H., Zuber, M. et al. Induction Hardening vs Conventional Hardening of a Heat Treatable Steel. Metall Mater Trans A 45, 5657–5666 (2014). https://doi.org/10.1007/s11661-014-2518-4

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  • DOI: https://doi.org/10.1007/s11661-014-2518-4

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