抄録
It was proved in an earlier paper by the author that addition of graphite into molten cast iron of high sulfur content increases the amount of residual graphite perticles in the melt. This paper reports the results of experiments confirming that the residual graphite particles act as nuclei of graphite during solidification, using the number of eutectic cells as the index of the number of graphite nucleation. Further, it refers to the effect of sulfur on the process of graphite growth by means of thermal analysis and structural observation. Correspondence between the increase in the number of the residual graphite and the increase in the number of eutectic cells has been observed and it was established that the residual graphite particles affect graphite nucleation. It must be noted, however, that although graphite addition into a molten iron with extremely high sulfur content results in a high degree of nucleation, it can also result in retarded growth of graphite.
