摘要
采用Gleeble-3500型热模拟试验机在变形温度为795~895℃且应变速率为0.001~1.0 s^(-1)条件下对新型超高强韧TB17钛合金进行热模拟压缩实验,研究合金高温变形微观组织和塑性流动行为,建立流动应力本构模型。结果表明,合金流动应力随应变增加先快速增加,后轻微降低,最终趋于平稳。合金发生部分动态再结晶,以动态回复为主,流动应力出现轻微下降与合金部分动态再结晶有关。合金动态再结晶体积分数不高于40%,动态再结晶机制以弓弯机制为主。构建以Arrhenius方程为基础的本构模型,得到合金在变形温度为795~895℃、应变速率为0.001~1.0 s^(-1)条件下平均变形激活能Q值为205.48 kJ/mol,预测精度较高,平均相对误差δavg为3.987%,相关系数R为0.9972。该模型构建为TB17钛合金热变形过程流动应力提供准确预测,也为其他合金高精度本构模型构建提供参考。
Thermal simulation compression tests are conducted on a new type of ultra-high strength and toughness TB17 titanium alloy using Gleeble-3500 thermal simulation testing machine under the conditions of deformation temperature ranging from 795℃to 895℃and strain rate of 0.001 s−1 to 1.0 s−1.The microstructure and plastic flow behavior of the alloy during hot deformation are analyzed,and a constitutive model of flow stress is established.The results show that the flow stress of the alloy increases rapidly with the increase of strain,then decreases slightly,and finally tends to be stable.Partial dynamic recrystallization occurs in the alloy,dominated by dynamic recovery,and the slight decrease in flow stress is related to the partial dynamic recrystallization of the alloy.Dynamic recrystallization volume fraction of the alloy is not higher than 40%,and the dynamic recrystallization mechanism is mainly dominated by the bowing mechanism.A constitutive model based on the Arrhenius equation is constructed,and the deformation activation energy Q value of the alloy at the temperature of 795-895℃ is obtained as 205.48 kJ/mol.The model has high prediction accuracy,with average error δavg of 3.987% and correlation coefficient R of 0.9972.The construction of this model provides an accurate prediction for the flow stress of TB17 titanium alloy during hot deformation and also offers a reference for the establishment of high-precision constitutive models for other alloys.
作者
郑超
胡生双
朱知寿
王新南
李明兵
朱彬
崔霞
欧阳德来
ZHENG Chao;HU Shengshuang;ZHU Zhishou;WANG Xinnan;LI Mingbing;ZHU Bin;CUI Xia;OUYANG Delai(AVIC Xi’an Aircraft Industry(Group)Co.,Ltd.,Xi’an 710089,China;Key Laboratory of Advanced Titanium Alloys,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;School of Material Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China)
出处
《航空材料学报》
北大核心
2026年第3期28-36,共9页
Journal of Aeronautical Materials
基金
国家自然科学基金项目(52561013)
江西省自然科学基金项目(20242BAB25216)。
关键词
TB17钛合金
高温变形
微观组织
变形机制
本构模型
TB17 titanium alloy
high-temperature deformation
microstructure
deformation mechanism
constitutive model
