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奥氏体→铁素体相变过程是钢铁材料中最重要的一个反应过程.采用高精度膨胀仪系统考察了纯铁的奥氏体→铁素体转变过程.从铁素体生成速率曲线中确认了一种异常的奥氏体→铁素体转变现象,即多峰不连续转变.异常奥氏体→铁素体转变的出现取决于初始奥氏体晶粒的大小.随着初始晶粒的减小,其相应的相变机理将从多峰不连续转变逐渐过渡为单峰连续转变.固态转变界面前沿弹塑性畸变能积聚所引发的重新形核过程是异常奥氏体→铁素体相变出现的根本原因.
Austenite → ferrite transformation process is the most important reaction process in steel.Using high-precision dilatometer system to investigate the transformation of pure iron from austenite to ferrite.From the ferrite formation rate curve Anomalous austenite → ferrite transformation was confirmed, ie, multimodal discontinuous transformation.The occurrence of abnormal austenite → ferrite transformation depends on the size of the initial austenite grains.With the initial grain The corresponding phase transition mechanism will gradually shift from multi-peak discontinuous transition to unimodal continuous transition.The recrystallization caused by the accumulation of elastic-plastic deformation energy at the front of the solid-state transition interface is anomalous austenite → ferrite The root cause of the phase change.