铸铁中球状石墨的结构和生长机制

A Structure and Mechanism of the Graphite Spherulite in Cast

摘要: 提出了一种由锥形螺旋体所组成的球状石墨结构模型,同时给出了单个锥形螺旋体的主要剖面图。每个锥形螺旋体中石墨的0001面绕着锥对称轴连续螺旋生长,其〈0001〉方向近似乎行于锥对称轴。Mg和Ce添加对石墨形核的影响也进行了讨论。这一模型可以更好地解释球状石墨各种截面的组织特征,而且与实验结果基本一致。

Abstract: A Mechanism of the G.S structure consisted of comical helixes is presented based on TEM, and the arrays of misoriented graphite platelets 0001 in each comical helix are believed to be grew up in spiral. The effects of Mg and Ce additions on the nucleations and growth of graphite are also discussed. The microstructure on the section of G.S observed earlier can be explained satisfactorily in term of the model.