本文介绍利用透射电镜观察塑性加工后,白口铸铁形变、呈复和再结晶过程的组织及亚结构的变化。经研究发现:塑性加工的白口铸铁中共晶碳化物位错滑移、交割并形成位错网络,出现共晶碳化物亚晶块,继而“破碎”并钝化。而基体的位错增殖且晶粒细化,有分布较均匀的粒状碳化物。故此,白口铸铁强韧性有较大提高。 This article describes the use of transmission electron microscopy plastic processing, white cast iron deformation, precipitation and recrystallization of the microstructure and sub-structure changes. The study found that: plastic processing of white cast iron eutectic carbide dislocation slip, delivery and the formation of dislocation network, there eutectic carbide sub-crystal block, and then “broken” and passivation. The matrix dislocation proliferation and grain refinement, there are more uniform distribution of granular carbides. Therefore, the toughness of white cast iron has greatly improved.