消失模型鋳造法における Fe-C系合金の吸炭現象

抄録

  The carbon pickup phenomenon in the evaporative pattern casting process was investigated using hypoeutectic cast iron, spheroidal graphite cast iron, cast steel, and high chromium cast iron as Fe-C system alloys. The carbon pickup phenomenon occurred due to thermal decomposition products in front of the melt flow. When the distance of the melt flow was 100 mm, the carbon pickup ratio of hypoeutectic cast iron and high chromium cast iron was more or less maximum. The carbon pickup ratio rose as the carbon equivalent of molten cast iron decreased. In particular, the carbon pickup ratio in cast steel was remarkably high. Conversely, carbon pickup phenomenon did not occur in molten spheroidal graphite cast iron with hypereutectic composition. The carbon pickup ratio increased with an increase in the blended ratio of EPS in the foamed pattern on the hypoeutectic cast iron.