前言蠕虫状石墨铸铁中的石墨形态是片状石墨向球状石墨转变的中间型石墨,国内外许多研究结果表明,从一种石墨形态到另一种石墨形态是逐渐转变的,因此这种过渡型石墨的形态是多种多样的。球墨铸铁中 Introduction The morphology of graphite in worm-like graphite cast iron is the intermediate type of graphite transformed from flake graphite to spherical graphite. Many studies both at home and abroad show that the transition from one graphite morphology to another is gradually changing. Therefore, The shape of graphite is varied. Ductile iron