1.概论生产球墨铸铁时很重要的一点就是要在浇铸前就知道(即能检查)其组织,特别是石墨的形状。这种石墨形状的检查目前在绝大多数铸造企业中是在浇铸铸件之前把经过用镁处理过的铁水浇铸一个圆柱形的试样,然后打断看它的宏观组织,或者作金相检查。前一种方法虽 1. Introduction The important point when producing ductile iron is to know (that is, to examine) its organization, especially the shape of graphite, prior to casting. Inspection of this graphite shape is currently performed in the majority of foundries by casting a cylindrically shaped sample of hot metal that has been subjected to magnesium treatment before casting the castings and then interrupting the macrostructure of the sample or examining it metallurgically. Although the former method