对一种低合金钢中的贝氏体组织在550、600和650℃等温过程中的组织演化进行了原位追踪研究.结果表明:贝氏体在A1温度以下通过回复与再结晶方式向多边形铁素体演化,随着等温温度升高,不但整体演化进程明显加快而且演化行为也发生变化.在550℃,新的再结晶晶粒形核于原奥氏体晶界并在长大过程中吞食贝氏体铁素体和粒状贝氏体;当温度升高至600℃以上时,一部分贝氏体铁素体转变为粒状贝氏体,继而转变为多边形铁素体;在较高的650℃,预先存在的粒状贝氏体能够发生明显的扩张并吞食贝氏体铁素体.贝氏体的重加热演化过程与形变金属的退火过程有明显区别,其主要原因在于贝氏体中来自于贝氏体相变的高密度位错具有独特的分布方式.
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