对08钢和20Mn形变强化相变后退火过程的组织演变的观察表明,超细铁素体退火时的长大是应变能及晶界能共同驱动的正常长大,长大阻力是第二组织的钉扎.形变使奥氏体以离异方式加速分解.在所用应变量下,08钢中的超细铁素体快冷到600 ℃以下不会有明显长大.碳锰含量的提高降低了形变强化相变进行的程度,使随后的铁素体长大受到相变驱动力的作用并加大了带状组织特征,铁素体难以正常长大.20Mn中第二组织的增多提供了形变强化相变后调整第二组织的空间及必要性.总结了碳锰含量、退火温度、形变量等因素影响的超细铁素体退火时的组织演变规律.
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