本文用等温冰盐水液淬法制备了过共晶蠕墨铸铁试样,并用透射电子显微镜对此试样的薄膜进行了观察,对石墨内部的异质点、条纹进行了分析,结果表明:蠕虫状石墨生长改变方向处存在着许多异质点,这些异质点除含少量Si外,几乎全部为铁;同时,石墨内部还存在着许多孪晶和位错,并且认为孪晶对蠕虫状石墨在空间改变生长方向有一定的作用,位错可以给石墨的生长提供生长台阶。
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.
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