一、前言蠕虫状石墨铸铁是一种新型的结构材料。这种材料的石墨是以蠕虫状石墨为主,有球团状石墨共存。蠕虫状石墨的形状处在片状石墨和球状石墨之间,石墨短而厚、微曲、具有圆弧形的末端。因而,蠕虫状石墨铸铁具有接近于球铁的强度和刚度,有一定的韧性和良好的耐磨性,并有较小的壁厚敏感性。又有与灰铸铁近似的铸造性能(流动性好、收缩小)和良 First, the preface The worm-shaped graphite cast iron is a new type of structural materials. The graphite of this material is mainly worm-shaped graphite, coexistence of pellet-like graphite. The worm-like graphite is in the shape of flaky graphite and spherical graphite, graphite is short and thick, slightly curved, and has an arc-shaped tip. Thus, vermicular graphite cast iron has a strength and rigidity close to that of ductile iron, a certain toughness and good abrasion resistance, and a smaller wall thickness sensitivity. Another cast iron with similar castability (good fluidity, small shrinkage) and good