作　　者： ; ; ; ;

机构地区： 东北大学材料与冶金学院轧制技术及连轧自动化国家重点实验室

出　　处： 《东北大学学报（自然科学版）》 2012年第10期1419-1423,共5页

摘　　要： 利用MMS-300热模拟试验机,对20Mn2SiV非调质钢在变形温度为900~1 100℃及应变速率为0.01~10s-1条件下的流变应力进行了研究,讨论了Z参数与动态再结晶之间的关系,并建立了该钢的热变形流变应力模型.结果表明：采用Z参数可以判断动态再结晶发生与否,当lnZ≤32.76时,20Mn2SiV非调质钢发生动态再结晶;根据动态再结晶发生与否以及应变是否达到动态再结晶临界应变值,分别建立了不同情况下的流变应力模型,模型拟合效果良好. The flow stress of 20Mn2SiV micro-alloyed torgmg steel was mvesugateo by MMS- 300 thermo-mechanical simulator at the deformation temperature of 900--1 100℃ and the strain rates ranging from 0. 01 to 10 s-1 The relationship between Z parameter and dynamic recrystallization was discussed. A flow stress model of the steel was developed during hot deformation. The results showed that the occurrence of dynamic recrystallization can be judged by Z parameter. When lnZ is less than or equal to 32.76, the dynamic recrystallization takes place. The flow stress models were established, respectively, according to whether the dynamic recrystallization occurs or the strain is higher than the critical strain or not. The models show a good fitting precision.

关 键 词： 非调质钢 热变形 动态再结晶 流变应力模型

领　　域： [金属学及工艺] [金属学及工艺]