Effect of Niobium and Titanium on Dynamic Recrystallization Behavior of Low Carbon Steels  

作　　者：MA Li-qiang LIU Zhen-yu JIAO Si-hai YUAN Xiang-qian WU Di 

机构地区：[1]Shenyang Metrology Testing Institution, Shenyang 110179, Liaoning, China [2]State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110004, Liaoning, China [3]Institute of Research and Development, Baosteel Co, Shanghai 201900, China

出　　处：《Journal of Iron and Steel Research International》2008年第3期31-36,共6页

基　　金：National Natural Science Foundation of China (50474086,50334010);Program for New Century Excellent Talents in Universities of the Ministry of Education of China (NCET-04-0278)

摘　　要：Using a Gleeble 3800 thermo-mechanical simulator, the effect of niobium and titanium on the dynamic recrystallization （DRX） behavior of low carbon steels was investigated. Isothermal single compression tests were performed in the temperature range of 850 to 1 150 ℃ at constant strain rates of 0.1 to 5 s-1. The experimental results showed that the addition of niobium and titanium to the low carbon steels significantly increased both the peak stress and steady state stress. The activation energy of deformation Qd was larger than the activation energy associated with the steady state stress Qss. Furthermore, the difference between Qd and Qss became significant because of the addition of niobium and titanium. DRX is effectively retarded because of solute dragging and dynamic precipitate pinning of niobium and titanium, resulting in higher values of the peak strain and steady state strain. Finally, the influence of niobium and titanium on the DRX kinetics and steady state grain size was determined.Using a Gleeble 3800 thermo-mechanical simulator, the effect of niobium and titanium on the dynamic recrystallization （DRX） behavior of low carbon steels was investigated. Isothermal single compression tests were performed in the temperature range of 850 to 1 150 ℃ at constant strain rates of 0.1 to 5 s-1. The experimental results showed that the addition of niobium and titanium to the low carbon steels significantly increased both the peak stress and steady state stress. The activation energy of deformation Qd was larger than the activation energy associated with the steady state stress Qss. Furthermore, the difference between Qd and Qss became significant because of the addition of niobium and titanium. DRX is effectively retarded because of solute dragging and dynamic precipitate pinning of niobium and titanium, resulting in higher values of the peak strain and steady state strain. Finally, the influence of niobium and titanium on the DRX kinetics and steady state grain size was determined.

关 键 词：peak strain activation energy dynamic recrystallization 

分 类 号：TG142[一般工业技术—材料科学与工程]