用热模拟变形实验研究了低碳微量铌钢形变中的动态相变以及形变后冷却中的相变行为,透射电镜观察了Nb(CN)的析出及对铁素体晶粒截径和体积转变量的影响.结果表明:含Nb钢动态相变中铁素体形核位置依次为原奥氏体晶界、铁素体/奥氏体的相界前沿直至奥氏体晶内,随着细小的应变诱导Nb(CN)析出在基体上弥散分布,铁素体的转变量大幅增加并且其相变长大趋势得到有效抑制,使得铁素体的长大在时间和空间上均受到限制,是一个以形核为主的过程,相变完成后铁素体晶粒截径约为2 μm;而形变后冷却相变工艺中铁素体的形核位置主要为奥氏体晶界以及形变带,而大量弥散分布的Nb(CN)析出对细化铁素体晶粒的作用并不明显,是一个形核长大的过程,最终得到的铁素体晶粒截径约为7 μm.
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