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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.
The microstructure evolution of eutectoid steels during deformation from 600 ℃ to 700 ℃ was studied by means of thermal simulation of compressive deformation, SEM and thermomagnetic test. The effects of deformation and subsequent heat treatment on the properties of pearlite, microstructure refinement and carburization The results show that the pearlite layer dissolves and the cementite gradually spheroidizes during the deformation process of eutectoid steel and the microstructure of finely dispersed cementite with the recrystallization of dynamic recovery of ferrite Matrix precipitation process.Improvement of the temperature is conducive to the composite process.Deformed tissue after insulation, submicron-level equiaxed ferrite grains and cementite particles disperse the distribution of complex phase organization increased the degree of uniformity The fact that the cementite dissolved during the warm deformation and re-precipitated in the ferrite was confirmed.