鋳鉄中の球状黒鉛中心に観察される輝点組織の光学理論による解析

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  • Optical Analysis on High Reflected Point at Center of Spheroidal Graphite in Ductile Iron
  • チュウテツ チュウ ノ キュウジョウ コクエン チュウシン ニ カンサツ サレル キテン ソシキ ノ コウガク リロン ニ ヨル カイセキ

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  Much has been discussed over the extraordinary high reflected point at the center of spheroidal graphite in ductile iron under optical microscopes. The calculated images of radial oriented model and the observed images were compared to understand the strange contrast. The following physical effects on high reflectivity have been discussed; (1) optical anisotropy of graphite, (2) surface roughness and surface gradient against optical axis, (3) existence of foreign particles at the center of the structure. At the each intersection, the optically calculated images of spheroidal graphite shows good agreements with the observations. The effect of surface roughness and surface gradient is much smaller than that of optical anisotropy. And the reported foreign particles are expected to show lower reflectivity than the observations. The optical anisotropy of spheroidal graphite can be the main reason for the high reflected point.

収録刊行物

  • 鋳造工学

    鋳造工学 71 (1), 22-27, 1999

    公益社団法人 日本鋳造工学会

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