利用Gleeble1500热模拟单向压缩实验机，研究基于“形变强化相变”获取细晶双相低碳钢的规律。通过观察不同原始奥氏体组织在形变强化相变下的组织演变，分析了铁素体转变的过程中马氏体/奥氏体（M/A）岛形貌以及分布的演变特征，并考察了原奥氏体晶粒大小、形变温度、形变速率等参数对铁素体转变动力学的影响。结果表明，通过调整原始奥氏体晶粒尺寸并控制形变强化相变进程，可以获得在均匀细小的铁素体（2～3μm）基体上弥散分布着不同体积分数、颗粒状、细小M/A岛的双相组织。
Fine grained dual phase steel obtained by deformation enhanced transformation (DEFT) was investigated by using hot compressing simulation experiments. The evolution of ferrite grains and M/A islands distribution during deformation were analyzed. The effects of initial austenite grain size、deformation temperature and strain rate on ferrite transformation kinetics were taken into consideration. The experimental results showed that the microstructure of fine grained ferrite(2～3μm)with fine granular M/A islands dispersing in the matrix can be achieved by controlling the initial austenite grain size and DEFT. Fine dual phase structure can be achieved by austenite recrystallization and the subsequent controlled DEFT.
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