变形温度对高Ti微合金高强钢再结晶的影响

Effect of Deformation Temperature on Recrystallization of High Ti Microalloy High Strength Steel

采用Gleeble-3500热模拟试验机研究了不同变形温度对Ti微合金钢再结晶行为的影响。基于流动应力、应力硬化曲线、应力松弛曲线对Ti微合金钢动态再结晶和静态再结晶行为进行了分析。结果表明,微合金元素Ti能够显著抑制动态再结晶的发生;在应变速率0.75 s^(-1)和真应变0.75时,随着变形温度的升高,变形后静态再结晶的孕育期缩短,再结晶速率加快;钢在1080℃变形结束后于0.07s时开始发生静态再结晶,1.45s时再结晶结束,整个再结晶过程只需1.38s,此温度下静态再结晶发生最为迅速。

The effect of deformation temperature on the recrystallization behavior of Ti microalloyed steel was studied by Gleeble-3500 thermal simulation tester.The dynamic recrystallization and the static recrystallization behavior of the Ti micro-alloy steel were analyzed based on the flow stress,the stress hardening curve and the stress relaxation curve.The results show that the microalloy element Ti can significantly inhibit the occurrence of dynamic recrystallization.When the strain rate is 0.75 s^(-1) and the true strain is 0.75,the incubation period of static recrystallization after deformation is shortened and the recrystallization rate is accelerated with the increase of deformation temperature.After deformation at 1080℃,static recrystallization of the steel begins at 0.07s and ends at 1.45s.The whole recrystallization process only needs 1.38s,and the static recrystallization at this temperature is the most rapid.