MICROSTRUCTURE OF VERMICULAR GRAPHITE IN CAST IRON
铸铁中蠕虫状石墨微观结构

An observation under TEM was carried out of the hetero-particles and stripes in-side of the vermicular graphite in cast iron specimens which were prepared by isothermally quenchingin ice-salt-water. The hetro-particles and stripes, composed of almost pure Fe and a little Si,were found on the regions of the growth direction changing of the vermicular graphite. Manytwins and dislocations were also observed to contribute to changing the growth direction and toproviding the growth steps of the graphite respectively.