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本文研究了化学成分、原始组织、微细化温度及保温时间对球铁微细组织的影响。实验结果表明:1、将球铁(QT60—2、QT40—10)加热到共析转变上部温区的某一温度,保温一定时间然后空冷,就可以获得晶粒直径为3—6μm的F+P双相基体组织;2、由于Si、Mn等元素偏析的影响,出现微细组织分布不均匀现象,于共晶团边界附近保留有粗大基体组织;3、微细化温度与化学成分有关,是一个很窄的温度范围(约20℃)。本文还讨论了球铁微细化组织的形成过程和改善微细组织分布不均匀现象的措施。
In this paper, the effects of chemical composition, original structure, microstructure temperature and holding time on the microstructure of ductile iron were studied. The experimental results show that: 1, the ductile iron (QT60-2, QT40-10) is heated to a certain temperature in the upper eutectoid transformation temperature, and after a certain time of heat preservation and air cooling, the F + P dual phase matrix microstructure; 2, due to the segregation of Si, Mn and other elements, the phenomenon of uneven microstructure distribution, remain in the eutectic group near the boundary of the coarse matrix; 3, the micronization temperature and chemical composition, is a Very narrow temperature range (about 20 ℃). The article also discusses the formation of the microstructure of the ductile iron and the measures to improve the uneven distribution of the microstructure.