Morphologies of Some Graphites in Ductile Cast Irons

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  • Hara Takamichi
    Komatsu Castex Ltd. Graduate School of Science and Engineering for Education, University of Toyama
  • Kitagawa Takahiro
    Graduate School of Science and Engineering for Education, University of Toyama
  • Kuroki Kenta
    Graduate School of Science and Engineering for Education, University of Toyama
  • Saikawa Seiji
    Graduate School of Science and Engineering for Research, University of Toyama
  • Terayama Kiyoshi
    Graduate School of Science and Engineering for Research, University of Toyama
  • Ikeno Susumu
    Hokuriku Polytechnic Collage
  • Matsuda Kenji
    Graduate School of Science and Engineering for Research, University of Toyama

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The internal structure of different types of graphite commonly found in the ductile cast iron were investigated by TEM technique for TEM samples prepared by FIB method to understand their nucleation and growth. Spheroidal and vermicular graphite were observed in the ductile cast iron with spheroidizing treatment. Flake graphite was observed in the same cast iron without the spheroidizing treatment. The spheroidal graphite had a three-fold internal structure, with an amorphous-like central region, annual rings of a layered intermediate region, and an outer region made up of large polygonal crystalline platelets in a mosaic-like structure. The vermicular and flake graphite had a similar to that of the outer region of the spheroidal graphite, in that it consisted of similar crystalline platelets.

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