Abstract
The relationship between the dissolved oxygen content (sol-O), eutectic temperature (TE), and the graphite shape was inspected by adding a spheroidaizer, mischmetal and tellurium to molten cast iron and holding the melt. The results were as follows : 1) In case of sol-O < 0.0001 %, higher TE led to a spheroidal the graphite shape and lower TE led the graphite shape to the vermicular. 2) In the case of sol-O > 0.0001 %, the graphite shape became type-A when TE was high, and type-D when TE was low. 3) It was also found that it became cementite when TE was close to an unstable eutectic temperature regardless of sol-O. These results show that the graphite shape can be estimated by the measurement of sol-O and TE.
