依据薄板坯连铸连轧工艺,在Gleeble 3800热模拟机上研究了钛微合金化高强钢的再结晶行为.结果表明:在低应变速率和高温下变形容易发生动态再结晶,而所有试验温度在ε=1 s-1时均表现为动态回复型;静态再结晶软化率会随着道次间隔时间、变形温度、变形速率、变形量的增加而升高;950℃以下变形随着道次间隔时间延长,会发生纳米碳化物的应变诱导析出,抑制静态再结晶发生.连轧过程中的变形速率远大于1 s-1,不具备发生动态再结晶的条件;在连轧总变形量不变的前提下,采取前后加强、中间减弱的道次变形量分配方式,细化成品组织.
Recrystallization behavior of titanium micro-alloycd high strength steel in the progress of the thin slab continuous casting and rolling was studied by using a Gleeble 3800 thermo simulator.The results indicate that dynamic recrystallization is easier to occur at low strain rate and high deformation temperature,but dynamic recovery will occur at all the test temperature when the strain rate is 1 s-1.The static recrystallization softening rate will increase with the increasing of deformation temperature,strain,strain rate and the pass interval time.Below 950 ℃,with the extension of the pass interval time,the strain-induced precipitation of nanometer carbide will present and inhibit the static recrystallization process.Due to the strain rate is much greater than 1 s-1,the dynamic recrystallization will not occur in the continuous rolling process.In order to refine the microstructure under the condition that the total deformation of rolling is constant,the beginning and the end pass adopt the large deformation,and the middle pass uses the small deformation.
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