Fe-C合金の黒鉛形態に及ぼす硫黄と酸素の影響

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タイトル別名
  • Influence of Sulfur and Oxygen on Graphite Morphology in Fe-C Alloys
  • Fe C ゴウキン ノ コクエン ケイタイ ニ オヨボス イオウ ト サンソ ノ エイキョウ

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抄録

  The present research was conducted to verify the effects of sulfur and oxygen on graphite morphologies using a Fe-C-120 massppm S mother alloy. In order to control the sulfur content in melt, three kinds of crucibles, namely, alumina, calcia, and calcia crucible with CaO-CaF2 powders were used. To control oxygen partial pressure, air, argon, and Ar-3%H2 atmosphere were employed. <br>  After melting in the alumina crucible, only flake graphite was formed in the specimen containing 78～98 massppm S. In the case of calcia crucible, aggregated and chunky graphite were observed in the specimen containing 11～20 massppm S. The specimen melted in a calcia crucible with CaO-CaF2 powders, showed spheroidal graphite with chunky graphite whose sulfur content was 1 to 11 massppm. <br>  We confirmed that the spheroidal graphite is formed due to the low activity of sulfur and oxygen below critical levels. The critical levels changed with the cooling rate of samples. In addition, the cooling curve of the specimen melted in calcia crucible with CaO-CaF2 powders did not show constant eutectic temperature, which is generally observed in that of flake graphite cast iron. This result is attributed to the solidification mode of spheroidal graphite, which differs from that of the flake graphite cast iron.

収録刊行物

  • 鋳造工学

    鋳造工学 78 (4), 175-180, 2006

    公益社団法人 日本鋳造工学会

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