Ti在铸态奥氏体中锰钢中主要以TiC的形式存在。由热力学计算和透射、扫描电镜观察及相结构分析与微区成分分析证实:TiC可以在液态中锰钢中优先生成,做为奥氏体结晶的非均质核心,细化奥氏体晶粒,阻碍位错运动,造成了位错的塞积与增殖,有效地强化了基体。并发现TiC做为团球状共晶渗碳体的非均质核心,使团球状共晶渗碳体大量弥散地分布于奥氏体晶间。
The majority of Ti is found to be preferentially precipitated in theform of TiC from medium manganese steel melt. The TiC may contribute to theheterogeneous nuclei of fine austenite crystallization, to the retardation of disloca-tion movement, as well as, to pile-up and proliferation of dislocations, thus, thematrix of the as-cast austenitic medium manganese steel will be effectively strength-ened. It was also found that the TiC can be acted as the heterogeneous nuclei ofthe nodular eutectic carbides formation and caused the dispersion of an abundanceof the carbides in the interstices between austenite dendrite arms.
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