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Electron backscatter diffraction and performance of a severely deformed steel

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Abstract

This study investigated electron backscatter diffraction and performance of ultrafine-grained interstitial-free (IF) steel fabricated by an asymmetric rolling process (ASR). For ASR operations, plastic strain was induced with a thickness reduction of 30% per pass and a roll speed ratio of 1:4 for the lower and upper rolls, respectively. As the number of operations increased, the deformed microstructure developed gradually from a band-like structure, which was observed after a single pass, to almost equiaxed ultrafine grains (~0.7 μm) divided by high-angle boundaries after 4-pass ASR. The mechanical behaviors analyzed by microhardness and tension tests showed that the mechanical strength of the IF steel samples improved with increasing number of ASR operations, which was associated with the structural refinement and textural evolution in the ASR-deformed sample.

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Acknowledgements

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, South Korea (NRF-2014R1A1A2059004).

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Authors and Affiliations

  1. School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, 16419, South Korea

    Kotiba Hamad

  2. Plasticity Control and Mechanical Modeling Lab, School of Materials Science and Engineering, Yeungnam University, Gyeongsan, 38541, South Korea

    Young Gun Ko

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  1. Kotiba Hamad
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Correspondence to Young Gun Ko.

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Hamad, K., Gun Ko, Y. Electron backscatter diffraction and performance of a severely deformed steel. J Mater Sci 52, 3936–3945 (2017). https://doi.org/10.1007/s10853-016-0655-4

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  • DOI: https://doi.org/10.1007/s10853-016-0655-4

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