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Visualization of Microstructural Factor Resisting the Cleavage-Crack Propagation in the Simulated Heat-Affected Zone of Bainitic Steel

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Abstract

Cleavage-crack propagation behavior was investigated in the simulated coarse-grained heat-affected zone (CGHAZ) of bainitic steel using electron backscattering diffraction (EBSD) pattern analysis when a low heat input welding was simulated. From viewpoint of crystallographic analysis, it was the condition in which the Bain zone was smaller than the close-packed plane (CP) group. It was clarified that the Bain zone and CP group boundaries provided crack-propagation resistance. The results revealed that when the Bain zone was smaller than the CP group, crack length was about one quarter the size of that measured when the CP group was smaller than the Bain zone because of the increasing Bain-zone boundaries. Furthermore, it was clarified that the plastic work associated with crack opening and resistance at the Bain and CP boundaries could be visualized by the kernel average misorientation maps.

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Authors and Affiliations

  1. Graduate School of Science and Engineering, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555, Japan

    Hidenori Terasaki (Professor) & Yu Miyahara (Undergraduate)

  2. Graduate School of Engineering, Osaka University, Osaka, Japan

    Mitsuru Ohata (Associate Professor)

  3. Technical Research & Development Bureau, Nippon Steel & Sumitomo Metal Corporation, Tokyo, Japan

    Koji Moriguchi, Yusaku Tomio (Researcher) & Kotaro Hayashi (Researcher)

Authors
  1. Hidenori Terasaki
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  2. Yu Miyahara
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  3. Mitsuru Ohata
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  4. Koji Moriguchi
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  5. Yusaku Tomio
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  6. Kotaro Hayashi
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Corresponding author

Correspondence to Hidenori Terasaki.

Additional information

Manuscript submitted on June 24, 2015.

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Terasaki, H., Miyahara, Y., Ohata, M. et al. Visualization of Microstructural Factor Resisting the Cleavage-Crack Propagation in the Simulated Heat-Affected Zone of Bainitic Steel. Metall Mater Trans A 46, 5489–5493 (2015). https://doi.org/10.1007/s11661-015-3167-y

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  • DOI: https://doi.org/10.1007/s11661-015-3167-y

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