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首页> 外文期刊>Chinese science bulletin >Abnormal austenite-ferrite transformation behavior in pure iron
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Abnormal austenite-ferrite transformation behavior in pure iron

机译：纯铁中奥氏体-铁素体的异常转变行为

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摘要

The austenite->ferrite transformation is the most important reaction route in the manufacture of Fe-based materials. Here the austenite (gamma)->ferrite (alpha) transformation of pure iron was systematically explored by high-resolution dilatometry. Abnormal transformation kinetics, multi-peak discontinuous reaction, was recognized in pure iron according to the variation of the ferrite-formation rate. The occurrence the one or the other type of gamma->alpha transformation strongly depends on the grain size: the transformation type changes from abnormal to normal (single-peak continuous reaction) with decreasing grain size. The inherent reason for the occurrence of abnormal transformation could be attributed to the repeated nucleation in front of the moving gamma/alpha interface induced by the accumulation of elastic and plastic accommodation energy.
机译：在铁基材料的制造中，奥氏体→铁素体相变是最重要的反应途径。在此，通过高分辨率膨胀法系统地研究了纯铁的奥氏体（γ）->铁素体（α）转变。根据铁素体形成速率的变化，在纯铁中发现了异常的转变动力学，即多峰不连续反应。一种或另一种类型的gamma->α相变的发生在很大程度上取决于晶粒尺寸：随着晶粒尺寸的减小，相变类型从异常变为正常（单峰连续反应）。发生异常转变的内在原因可以归因于弹性和塑性调节能量的积累在运动的γ/α界面前面反复成核。

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