中文摘要：

利用热模拟压缩变形、SEM和热磁法实验，研究了共析钢在600-700℃变形过程的组织演变规律，探讨了变形及随后保温过程对珠光体球化、组织超细化和渗碳体溶解、再析出的影响．实验表明：共析钢温变形过程中发生珠光体片层溶断，渗碳体逐渐球化，以及伴随铁素体动态回复再结晶的同时细小弥散渗碳体颗粒在基体析出的过程．提高温度有利于上述复合过程的进行．形变组织经过保温后，亚微米级别的等轴铁素体晶粒和渗碳体颗粒弥散分布的复相组织的均匀性程度有所提高．温变形过程中渗碳体溶解和在铁素体内再析出的事实得到证实．

英文摘要：

Microstructure evolution in eutectoid steel during warm deformation in the temperature range from 600 to 700 ℃ was investigated by simulating hot compression test, SEM and thermomagnetic measurement. The effects of deformation and subsequent annealing on the spheroidizing of pearlite, refining of microstructure and dissolution of cementite were studied. The experimental resuits indicated that during warm deformation of eutectoid steel, pearlite lamellas fractured, cementite gradually spheroidized, and dynamic recovery and recrystallization of ferrite took place with fine dispersive cementite particles being precipitated. An increase in deformation temperature enhanced the above processes. Following annealing, the microstructure consisting of submicron - scale equiaxed ferritic grains and dispersive cementite particles became more homogeneous. Partial dissolution and re-precipitation of cementite during warm deformation were confirmed.