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pISSN : 1598-706X / eISSN : 2288-8381


한국주조공학회지 (25권5호 195-202)

The Effect of Sb/RE on the As-Cast Morphology of Graphite and Mechanical Properties of Heavy Section Ferritic Ductile Cast Iron

후육 페라이트 구상흑연주철의 주방상태 흑연형상 및 기계적 성질에 미치는 Sb/RE의 영향

Hochul Shin, Hosung Yun, Jesik Shin, Sangmok Lee, Byungmoon Moon

Korea Institute of Industrial Technology


In this study, we investigated the effect of Sb/RE on the microstructure and mechanical properties of as-cast heavy sectioned, over 25omm thickness, ferritic ductile cast iron. Exothermic and thermal insulation material were equipped on the wall of sand cast mold having the dimensions of 250 >< 250 X 250 mm. The nominal composition of the molten metal was controlled to be on the eutectic composition and Sb was added about 0, 0.005 and 0.02% respectively. In the center of as-cast ingot without Sb addition, the solidification of chunky graphite was induced by the eutectic reaction that took long time, which caused the decrease of elon- gation and impact energy. In case that the value of Sb/RE is 0.8, the solidification of chunky graphite could be suppressed and the improvement of nodularity was observed. On the other hand, the excessive addition of Sb suppressed the solidification of chunky graphite but gave rise to the solidification of flake graphite and the increase of pearlite contents. This results in poor elongation and impact energy which is lower than those in the case of no Sb addition.


Sb/RE, Mechanical properties, Eutectic composition, Chunky graphite, Nodularity, Flake graphite, Pearlite.