【摘要】 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。更多还原

【Abstract】 Itwas confirmed that the m(?)phology of type D graphite structure is favourable to the forming of ferrite in the cast iron matrix. The function of stabillzig ferrite of silicon can be brought into full play in type D graphite cast iron under the condition of sand mold casting. As the content of silicon increases the mechanical strength will decrease within a big range. The increase of content of Manganese will cause the forming of pearlite and so as to increase the mechanical strength, but there is a small increase in hardness.The high strength type D graphite cast iron shows not only its excellent mechanical propreties but also its fine casting characteristics and machinablity.更多还原