β21s钛合金动态再结晶行为
Dynamic Recrystallization Behaviors of β21s Alloy
张 青1, 李 萍2, 薛克敏2
点击：3431次 下载：0次
作者单位：1. 安徽职业技术学院 机械系, 安徽 合肥 230051; 2. 合肥工业大学 材料科学与工程学院, 安徽 合肥 230009
中文关键字：β21s钛合金； 高温变形； 动态再结晶
英文关键字：β21s alloy; hot deformation; dynamic recrystallization
中文摘要：利用Gleeble1500热模拟试验机研究了β21s钛合金在高温变形条件下的动态再结晶行为及晶粒尺寸变化规律。实验结果表明，β21s钛合金在温度较高、应变速率较低的情况下变形时，表现出典型的动态再结晶行为， 动态再结晶晶粒尺寸随变形温度的升高和变形速率的降低而增大。确定了该合金的激活能为227.07 kJ/mol，应力指数为3.42，Z因子决定着动态再结晶的晶粒尺寸，二者之间为幂指数关系，进一步得出再结晶晶粒尺寸的预测模型，为该合金热变形过程的组织控制提供理论依据。
英文摘要：Dynamic recrystallization behaviors and grain size under hot deformation conditions for β21s alloy were studied using Gleeble 1500 thermomechanical testing system. The results show that β21s alloy exhibits a typical DRX behavior at higher deformation temperature and lower strain rates. The recrystallization grain size increases with the increase of deforming temperature and the decrease of strain rates. Activation energy and exponent is 227.07 kJ/mol and 3.42, respectively. The recrystallization grain size is determined by Zener-Hollomon parameter (Z) and an exponential function is held between Dr and Z. The size model of dynamic recrystallization is established. It lays a scientific foundation for microstructure controlling during hot deformation.