Effects of Reaction Chamber with Inmold Process on Transition Graphite Structure of Cast Iron

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  • 改良インモールド法による遷移黒鉛組織に及ぼす反応室形状の影響
  • カイリョウ インモールドホウ ニヨル センイ コクエン ソシキ ニ オヨボス

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Abstract

  Inmold process is a graphite spheroidization treatment carried out a reaction chamber in a mold set with special spheroidizers beforehand. A new melt combination process, which can produce new functional iron materials, was developed by the authors’ further studies. In this new process, both the spheroidized and inoculated melts are collided with each other in the mold cavity to form a characteristic transition graphite structure. One side of the material has the specific properties of spheroidal graphite cast iron and the opposite side has that of the flake graphite cast iron. In this study, the effects of gate type and size, amounts of treatment alloy, and cross section of reaction chamber on the control of the graphite morphology from the spheroidal via the compacted vermicular to the flake in the iron structure were investigated. Besides thermal analysis of the melts, ultrasonic velocity measurement and micro-graphite structure observation were also carried out.

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