球状黒鉛鋳鉄の引張強さ, 鋳造性, ミクロ組織に及ぼすスピネルるつぼ中溶湯保持の影響

抄録

  The molten metal properties and mechanical properties of cast iron are considered to change if the molten cast iron is held in the furnace over an extended period of time for the sintering work or due to line trouble.

  In this study, the chill depth, number of graphite counts, shrinkage cavities, fluidity, and tensile strength of cast iron were investigated when the molten iron was held at 1773K for a long time using a spinel crucible without being carburized. After holding the molten metal for a long time, the graphitization ability was found to decrease, the number of graphite counts decrease, and the chill depth and shrinkage volume increase. The area ratio of pearlite and tensile strength also increased.