热模拟单向压缩下中碳钢形变温度低于Ad3(786℃)点时,析出形变诱导铁素体(DIF),DIF量随形变温度降低而提高;在低于750℃形变时,DIF量远高于平衡态铁素体含量54%.DIF析出时碳原子高度富集在铁素体晶界和铁素体/奥氏体界面.在低于A1(719℃)等温处理时,高于Ad3点形变试样中,奥氏体转变为铁素体+片层状珠光体;低于Ad3点但高于Ar3(645℃)点形变时,未转变奥氏体转变为铁素体+片层状珠光体+晶界渗碳体;稍高于Ar3点形变时,将获得铁素体+弥散渗碳体的球化组织.
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