TWIP钢高温变形行为的研究  

Investigation on Hot Workability Behavior of TWIP Steel

作　　者：张志波[1] 张维娜[1] 刘振宇[1] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2012年第6期819-822,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(50874131)

摘　　要：通过单道次压缩试验,对Fe-Mn-C系孪生诱导塑性钢（TWIP钢）,在800~1 000℃,应变速率0.01~10.0 s-1条件下的热变形行为及组织演变规律进行了研究.实验结果表明,升高温度和降低应变速率均可促进奥氏体发生动态再结晶.根据实验所得流变应力曲线,由热变形方程计算得到了TWIP钢热变形激活能Q=421.37 kJ/mol.并在此基础上得到了TWIP钢高温变形的热加工方程.采用Z参数预测了动态再结晶的临界条件,当Z≤9.94×1018时TWIP钢易发生动态再结晶,具有较好的热加工性能.The hot deformation behavior of Fe-Mn-C twinning induced plasticity （TWIP） steel was investigated by hot compression tests in the temperature range of 800 -- 1 000 ℃ and strain rate range of 0.01- 10 s-1. Experimental results showed that increasing the temperature and decreasing strain rate promote the occurrence of dynamic recrystallization of austenite. According to the experimental flow stress curves, the hot working equation is obtained and the activation energy for plastic deformation is Q = 421.37 kJ/mol. The occurrence of dynamic recrystallization can be estimated by using a Zener-Hollomon type equation and metallographic examination. Dynamic recrystallization is prone to occur when Z≤9.94×10^18. The better hot deformation properties will be obtained under this condition.

关 键 词：微观组织 高温变形 动态再结晶 激活能 TWIP钢 

分 类 号：TG142.3[一般工业技术—材料科学与工程]