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一、绪言一般球铁用金属型铸造时,因急冷而产生白口和珠光体,其铸态延伸率几乎为零。用铁素体化退火方法,虽可稳定材质的组织和延伸率等,但由于表面氧化,会降低金属型铸件的尺寸精度,且不经济,生产上也有局限性。为此,笔者研究了金属型铸造中,硅量和锰量的变化对球铁铸态机械性能和组织变化等的影响,并探讨了用金属型铸造获得高韧性铸态铁素体
I. INTRODUCTION In general, when the ductile iron is cast by a metal type, white castings and pearlite are produced due to the rapid cooling, and the as-cast elongation is almost zero. With ferritic annealing method, although the material can stabilize the structure and elongation, but due to the surface oxidation, will reduce the dimensional accuracy of the metal casting, and not economical, there are limitations in the production. To this end, the author studied the metal casting, silicon and manganese content of the amount of change on the ductile iron mechanical properties and organizational changes, etc., and discussed the use of metal casting to obtain high toughness as-cast ferrite