Ti-22Al-26Nb合金热变形本构方程建立及软化行为研究  

Establishment of Constitutive Equation and Research on Softening Behavior of Ti-22Al-26Nb Alloy During Hot Deformation

作　　者：李萍[1,2] 左标 郭威威 胡勇 薛克敏 Li Ping;Zuo Biao;Guo Weiwei;Hu Yong;Xue Kemin(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China;School of Industrial and Equipment Technology,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]合肥工业大学工业与装备技术研究院,安徽合肥230009

出　　处：《稀有金属材料与工程》2018年第12期3811-3815,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51175137)

摘　　要：对热轧态Ti-22Al-26Nb合金高温变形中的力学行为和再结晶行为进行研究,建立其高温本构关系模型,对其中呈现出的动态再结晶多应力峰值曲线特征(以1000℃/0.1 s^(-1)为例)进行拟合分析。结果表明:基于双曲正弦函数建立Ti-22Al-26Nb合金的高温本构关系模型的精度较高,最大误差为2.6%,可以很好地描述合金在高温变形时各热力学参数之间高度非线性的复杂关系。由修正的Avrami方程预测得知再结晶体积分数与应变呈现典型的再结晶动力学增长趋势,揭示了该合金高温变形过程中复杂的软化行为。The high temperature mechanical behavior and recrystallization behavior of Ti-22Al-26Nb alloy were studied. A high temperature constitutive model of the alloy was established. The dynamic recrystallization multi-stress peak curve was analyzed by fitting the experimental results. The results show that it is feasible to establish the high temperature constitutive model of Ti-22Al-26 Nb alloy based on the hyperbolic sine function, which can describe the high nonlinearity of the thermodynamic parameters of Ti-22Al-26Nb alloy at high temperature complex relationship, and the maximum error is 2.6%. From the modified Avrami equation, it is predicted that the recrystallization volume fraction and the strain show a recrystallization kinetic growth trend, and the complex softening behavior of the alloy during high temperature deformation is revealed.

关 键 词：Ti-22Al-26Nb合金 本构关系 不连续屈服 再结晶行为 

分 类 号：TG379[金属学及工艺—金属压力加工]