一、前言蠕虫状石墨铸铁具有一些独特的机械及物理的综合性能,并已广泛地被用来制造钢锭模、气缸盖、排气管、剎车鼓及液压阀零件。同时对这一材料的显微组织特点以及石墨形态形成机理的研究,也引起了很大重视。因为蠕墨形态的一些因素的研究,也必然会加深对控制或改进灰铸铁及球墨铸铁生产工艺的一些因 I. Introduction Worm-shaped graphite cast iron has some unique mechanical and physical properties and has been widely used to make ingot molds, cylinder heads, exhaust pipes, brake drums and hydraulic valve components. At the same time on the material microstructure characteristics and the formation of graphite morphology mechanism, also attracted great attention. Because of the study of some factors in the morphology of vermicular graphite, it is bound to deepen some of the reasons for controlling or improving the production process of gray cast iron and ductile iron