溶融鋳鉄に対するミッシュメタルの挙動に関する研究

抄録

  The effects of the addition of cerium on the macro and microstructure of cast iron have been investigated.
  The results were as follows.
  (1) Added on the surface of molten iron, cerium reacts with oxygen so actively that cerium forms oxide and is lost without any suitable flux or coating.
  (2) The microstructures of cast iron added cerium showed, in turn from surface to bottom, unknown high cerium content ctructure, chilled structure and flake or eutectic graphite structure.
  The unknown structure consisted of Fe-Ce compound, cerium oxide and cerium sulfide.
  Cerium was remained in the chilled structure, but in the graphitized structure, cerium could not be detected at all.
  (3) With the aid of electron probe X-ray micro-analyser, it was cleared that cerium did not exist in cementite but on the boundary between cementite and austenite.
  (4) Silicon was detected in the same place that had high cerium concentration in the chilled structure.