<i>In-situ</i> Measurement of Bainitic Transformation Process using Digital Holographic Microscope

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  • Lin Chengrong
    Department of Materials Engineering, The University of Tokyo
  • Sekido Kenji
    Institute for Industrial Science, The University of Tokyo
  • Kim Ho-Heok
    Institute for Industrial Science, The University of Tokyo
  • Inoue Junya
    Department of Materials Engineering, The University of Tokyo Research Center for Advanced Science and Technology, The University of Tokyo

Bibliographic Information

Other Title
  • デジタルホログラフィック顕微鏡を用いたベイナイト変態のその場計測
  • デジタルホログラフィック ケンビキョウ オ モチイタ ベイナイト ヘンタイ ノ ソノ バ ケイソク

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Abstract

<p>A novel 3D in-situ measurement method was developed to clarify the bainitic transformation process of medium carbon steel. To achieve enhanced accuracy in 3D in-situ measurement by a digital holographic microscopy, the Gabor Wavelet transformation is introduced instead of the conventional reconstruction method based on the fast Fourier transformation. The effectiveness of the proposed method is first verified by comparison with the conventional reconstruction method as well as the other 3D measurement methods, such as atomic force microscopy and confocal laser microscopy. 3D in-situ observations were conducted to reveal the surface relief effect induced by the bainitic transformation behavior during continuous cooling. The results demonstrated that the measured shape deformation induced by the bainitic transformation corresponds well with the prediction by the phenomenological theory of martensite crystallography.</p>

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 108 (6), 360-369, 2022

    The Iron and Steel Institute of Japan

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