高クロム鋼，オーステナイト型ステンレス鋼とオリビンサンド及びけい砂鋳型との界面反応

概要

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The use of olivine sand as a molding material is limited in comparison with silica sand, and characteristics of olivine sand are not sufficiently known. Previous papers by the authors described that the olivine sand mold prevents burning not only in the case of high manganese cast steel but also of low carbon cast steel. Metal-mold reactions between high chromium and austenitic stainless cast steels and olivine and silica sand molds were investigated in the present work. The olivine sand mold exhibited similar or better resistance to burning than the silica sand mold with the high chromium or austenitic stainless steels. Cr and Mn in the liquid steels reacted with the surface of the olivine sand and formed a smooth shell on the mold surface. The smooth shell had a high packed density of solid sand particles and prevented metal penetration. After cooling, therefore, castings could be easily peeled off and showed no burning. But in the silica sand mold similar smooth shell was formed only with 25% chromium and austenitic steels. Quartz (silica sand) and olivine (dunite in olivine sand) scarcely reacted with Cr and/or Mn in the liquid high chromium steel. Neither Cr nor Mn were detected inside the quartz or the olivine caught in the smooth shell layer.
日本鋳造工学会の論文