Cooling Rate and Graphite Structure of Final Eutectic Solidification Part in Cast Iron

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  • 鋳鉄鋳物における共晶最終凝固部の冷却速度と黒鉛組織
  • チュウテツ イモノ ニ オケル キョウショウ サイシュウ ギョウコブ ノ レイキャク ソクド ト コクエン ソシキ

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A CE meter cup was modeled using a casting simulation software and cooling curves at different points of the casting model were calculated. In setting temp-solid fraction parameters, a Fe-C-Si ternary equilibrium diagram was used with a substantive temperature range in the eutectic solidification phase so that the γ-Fe ＋ G ＋ L phase can be considered. In studying the calculated cooling curve, an abrupt temperature drop was observed in the cooling curve in the final solidification period. This rapid cooling occurred during the course of eutectic solidification. The structure of the liquid phase was found to chill or become D-type graphite once it cooled abruptly to a degree below the eutectic temperature. This rapid cooling may be one of the causes of D-type graphite near the final solidification part of thick iron castings.

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