等轴组织TC21合金高温变形本构模型和热加工图  

Constitutive model and hot processing map of high temperature deformation of TC21 alloy with equiaxed microstructure

作　　者：牛勇 王耀奇 牛嘉伟 朱堂葵[3] NIU Yong;WANG Yao-qi;NIU Jia-wei;ZHU Tang-kui(School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;AVIC Manufacturing Technology Institute,Beijing 100024,China;School of Electromechanical and Information Technology,Yiwu Industrial and Commercial College,Yiwu 322000,China)

机构地区：[1]太原科技大学机械工程学院,山西太原030024 [2]中国航空制造技术研究院,北京100024 [3]义乌工商职业技术学院机电信息学院,浙江义乌322000

出　　处：《材料热处理学报》2021年第4期183-190,共8页Transactions of Materials and Heat Treatment

基　　金：太原科技大学博士启动基金(20192007,20202050)。

摘　　要：对等轴组织TC21合金在Gleeble-1500热模拟实验机上进行了等温压缩实验,变形温度为760、800、840、880、920和960℃(α+β相区),应变速率为0.001、0.01、0.1、1和10.0 s^(-1)。结果表明:TC21合金的流动应力随应变速率降低和变形温度升高而降低;随应变的增加,变形激活能从570 kJ·mol^(-1)减少到410 kJ·mol^(-1)。基于应变补偿的Arrhenius方程建立TC21合金高温变形本构模型,该模型可以精确地预测流动应力随工艺参数的变化。基于动态材料模型建立了TC21合金的热加工图;热加工图中的能量耗散效率和非稳态成形区域随着应变增加而改变。The isothermal compression tests of TC21 alloy with equiaxed microstructure at deformation temperature of 760 ℃, 800 ℃, 840 ℃, 880 ℃, 920 ℃ and 960 ℃ and strain rate of 0.001 s-1, 0.01 s^(-1), 0.1 s^(-1), 1 s^(-1) and 10.0 s-1were carried out on a Gleeble-1500 thermal simulator. The results show that the flow stress of the TC21 alloy decreases with the decrease of strain rate and the increase of deformation temperature. With the increase of strain, the activation energy of the alloy decreases from 570 kJ·mol^(-1) to 410 kJ·mol^(-1). The high temperature deformation constitutive model of the TC21 alloy is established based on the strain compensation Arrhenius equation, and the model can accurately predict the change of flow stress with process parameters. Based on dynamic material model, the hot processing map of the TC21 alloy is established, and the energy dissipation efficiency and the unstable forming region in the hot processing map change with increasing strain.

关 键 词：TC21合金 高温变形 本构模型 热加工图 

分 类 号：TG146.2[一般工业技术—材料科学与工程]