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High-Resolution EBSD Study of Adiabatic Shear Band and Neighboring Grains After Dynamic Impact Loading of Mn-Steel Used in Vehicle Structure

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Abstract

We report the results of the microstructural characterizations and micro-texture analysis of a lightweight austenitic steel deformed at high strain rate (1200 s−1) using a split Hopkinson pressure bar. Formation of adiabatic shear bands (ASB) and plastic deformation mechanisms within neighboring grains are investigated by high-resolution electron backscatter diffraction (HR-EBSD). HR-EBSD reveals formation of athermal ε-martensite and ά-martensite within the shear bands, resulting in the formation of a brittle intersection structure. Crack initiation and propagation is seen in intersection structure. The thermally induced ε-martensite follows Shoji-Nishiyama crystallographic orientation relationship with parent austenite phase, while ά-martensite shows Burgers relationship with ε-martensite. A detailed examination depicts the presence of deformation twins in grains adjacent to the ASB. Furthermore, strain-induced ε and ά martensite are formed in the neighboring grains of ASB. The micro-texture of martensite variants is discussed in ASB and in the neighboring grains.

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Authors and Affiliations

  1. Advanced Materials for Clean Energy, Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, Canada

    M. Eskandari, A. G. Odeshi & J. A. Szpunar

  2. Department of Materials Science & Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

    M. Eskandari

  3. Department of Mechanical Engineering, University of Bonab, Velayat Highway, Bonab, Iran

    M. A. Mohtadi-Bonab

  4. Hot Deformation & Thermo-mechanical Processing of High Performance Engineering Materials Lab, School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran

    A. Zarei-Hanzaki

Authors
  1. M. Eskandari
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  2. M. A. Mohtadi-Bonab
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  3. A. Zarei-Hanzaki
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  4. A. G. Odeshi
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  5. J. A. Szpunar
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Correspondence to M. Eskandari.

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Eskandari, M., Mohtadi-Bonab, M.A., Zarei-Hanzaki, A. et al. High-Resolution EBSD Study of Adiabatic Shear Band and Neighboring Grains After Dynamic Impact Loading of Mn-Steel Used in Vehicle Structure. J. of Materi Eng and Perform 25, 1611–1620 (2016). https://doi.org/10.1007/s11665-016-1923-9

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  • DOI: https://doi.org/10.1007/s11665-016-1923-9

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