D型石墨的组织形貌有利于在铸铁基体组织中生成铁素体相。在砂型铸造条件下,硅的稳定铁素体的作用能在D型石墨铸铁中得到充分的发挥,故硅含量的增加将引起D型石墨铸铁机械强度大幅度的下降。锰含量的增加能促进珠光体的形成而提高D型石墨铸铁的机械强度,但其硬度值上升的幅度较小。砂型铸造高强度D型石墨铸铁显示了其优越的机械性能和良好的铸造性能,加工性能。 The morphology of D-type graphite favors the formation of a ferrite phase in the cast iron matrix. Under the conditions of sand casting, the effect of stable ferrite of silicon can be fully exerted in D-type graphite cast iron. Therefore, the increase of silicon content will cause the mechanical strength of D-type graphite cast iron to drop drastically. The increase of manganese content can promote the formation of pearlite and improve the mechanical strength of D-type graphite cast iron, but its hardness value increases less. Sand casting high-strength D-type graphite cast iron shows its superior mechanical properties and good casting performance, processing performance.