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Multiscale Characterization of Microstructure in Near-Surface Regions of a 16MnCr5 Gear Wheel After Cyclic Loading

  • 3D Nanoscale Characterization of Metals, Minerals, and Materials
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Abstract

The dependence of the microstructure on the degree of deformation in near-surface regions of a 16MnCr5 gear wheel after 2.1 × 106 loading cycles has been investigated by x-ray diffraction analysis, transmission electron microscopy, and atom probe tomography. Retained austenite and large martensite plates, along with elongated lamella-like cementite, were present in a less deformed region. Comparatively, the heavily deformed region consisted of a nanocrystalline structure with carbon segregation up to 2 at.% at grain boundaries. Spheroid-shaped cementite, formed at the grain boundaries and triple junctions of the nanosized grains, was enriched with Cr and Mn but depleted with Si. Such partitioning of Cr, Mn, and Si was not observed in the elongated cementite formed in the less deformed zone. This implies that rolling contact loading induced severe plastic deformation as well as a pronounced annealing effect in the active contact region of the toothed gear during cyclic loading.

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Acknowledgements

The authors would like to thank Prof. Tenberge and Mr. Gondecki from Ruhr University Bochum for providing the gear wheel, and Ms. Susanne Jordans for assistance with XRD sample preparation.

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Authors and Affiliations

  1. Institute for Materials, Ruhr-Universität Bochum, 44801, Bochum, Germany

    Setareh Medghalchi, Steffen Salomon, Alireza Basir Parsa, Janine Pfetzing, Gunther Eggeler & Tong Li

  2. Interdisciplinary Center of Advance Materials Simulation (ICAMS), Ruhr-Universität Bochum, 44801, Bochum, Germany

    Setareh Medghalchi, Vahid Jamebozorgi, Arjun Bala Krishnan & Smobin Vincent

  3. Zentrum für Grenzflächendominierte Höchstleistungswerkstoffe (ZGH), Ruhr-Universität Bochum, Universitätsstraße 150, 44801, Bochum, Germany

    Janine Pfetzing, Aleksander Kostka, Yujiao Li & Tong Li

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  1. Setareh Medghalchi
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  2. Vahid Jamebozorgi
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  5. Steffen Salomon
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Correspondence to Tong Li.

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Medghalchi, S., Jamebozorgi, V., Bala Krishnan, A. et al. Multiscale Characterization of Microstructure in Near-Surface Regions of a 16MnCr5 Gear Wheel After Cyclic Loading. JOM 70, 1758–1764 (2018). https://doi.org/10.1007/s11837-018-2931-z

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  • DOI: https://doi.org/10.1007/s11837-018-2931-z

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