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Time Evolution of Solidification Structure in Ductile Cast Iron with Hypereutectic Compositions

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Abstract

The microstructure evolution in ductile cast iron with magnesium addition was observed in situ by using X-ray radiography (two-dimensional observation) and time-resolved tomography (three-dimensional observation) in the BL20XU of a synchrotron radiation facility, SPring-8 (Hyogo, Japan). In the two-dimensional observation, graphite nodules nucleated in the melt and floated up immediately after nucleation. The floating was terminated by engulfment of graphite nodules into austenite dendrites. The radiography indicated that the average floating distance was shorter than the dendrite arm spacings in the 100-μm-thick specimen. Because the short distance could be influenced by the sample confinement, time-resolved tomography was performed by using a pink X-ray beam in the BL28B2 of SPring-8. Graphite nodules that nucleated in the melt (probably on magnesium–oxygen–sulfur inclusions in the melt) floated and were engulfed by austenite dendrites within several seconds, even in the bulk specimen. Although the average distance in the bulk specimen was approximately twice as large as that in the 100-μm-thick specimen, floating after nucleation and engulfment into austenite dendrites within a short duration were observed commonly from both techniques. The sequence of nucleation and engulfment had a critical effect on the number and size of the graphite nodules.

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Acknowledgements

This paper was presented at the 2nd Carl Loper Cast Iron Symposium, which was held on September 30 to October 1, 2019, in Bilbao, Spain. This study was supported by a Grant-in-Aid for Scientific Research (S) from MEXT (17H06155). The synchrotron radiation experiments were performed as general projects at beamlines BL20XU, BL20B2 and BL28B2 at SPring-8 (JASRI). We thank Laura Kuhar, PhD, from Edanz Group (www.edanzediting.com/ac) for editing a draft of this manuscript.

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Author notes

  1. Kohei Morishita

    Present address: Department of Materials Science and Engineering, Kyushu University, Fukuoka, 819-0395, Japan

Authors and Affiliations

  1. Department of Materials Science and Engineering, Kyoto University, Kyoto, 606-8501, Japan

    Kiattisaksri Chatcharit, Kohei Morishita, Taka Narumi & Hideyuki Yasuda

  2. Department of Mechanical Engineering for Transportation, Osaka Sangyo University, Daito, 574-8530, Japan

    Akira Sugiyama

  3. Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), Sayo-cho, Hyogo, 679-5198, Japan

    Kentaro Kajiwara

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  1. Kiattisaksri Chatcharit
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  2. Akira Sugiyama
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Correspondence to Hideyuki Yasuda.

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This paper is an invited submission to IJMC selected from presentations at the 2nd Carl Loper 2019 Cast Iron Symposium held September 30 to October 1, 2019, in Bilbao, Spain.

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Chatcharit, K., Sugiyama, A., Morishita, K. et al. Time Evolution of Solidification Structure in Ductile Cast Iron with Hypereutectic Compositions. Inter Metalcast 14, 794–801 (2020). https://doi.org/10.1007/s40962-020-00424-3

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