On the Phenomena of Graphite Precipitation of Calcium Graphite Steel

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  • Ototani Tohei
    The Research Institute for Iron, Steel and Other Metals, Tohoku University
  • Morooka Yasuhiro
    Department of Metallurgy, Muroran Institute of Technology
  • Kataura Yasuzi
    The Research Institute for Iron, Steel and Other Metals, Tohoku University

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Other Title
  • カルシウム黒鉛鋼の黒鉛析出現象について
  • カルシウム コクエン コウ ノ コクエン セキシュツ ゲンショウ ニ ツイテ

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The process of graphite precipitation in hypereutectoid steels containing 1.5 to 1.7%C has been investigated by thermal analysis, dilatometric measurement and microstructural observation of water-quenched specimens. The results may be summarized as follows: (1) Any change due to graphite precipitation has not been ascertained by means of thermal analysis. The increased Si contents due to Fe-Ca alloy addition rises in Ar1 transformation more than that found in untreated steels. (2) In the dilatometric measurement the graphite precipitation occurs remarkably in the range of the Agr to the A1 transformation. However, if the amount of Fe-Ca alloy added increased, graphitization was also confirmed slightly above the Ac1 transformation in the process of heating and then showed ferrite formation under the Ar1 transformation in the process of cooling. The shape of the separated graphite by reheating was no longer spheroidal, but became a massive state.

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