Ti555211合金热变形行为研究  

Research on Hot Deformation Behavior of Ti555211 Titanium Alloy

作　　者：张娟[1] 崔林林[2] 高玉社[2] 孙剑 杜予晅[2] 安震[2] 

机构地区：[1]西北有色金属研究院材料分析中心,西安710016 [2]西部超导材料科技股份有限公司,西安710018

出　　处：《西安文理学院学报（自然科学版）》2018年第1期86-91,共6页Journal of Xi’an University(Natural Science Edition)

基　　金：国家国际科技合作专项(2013DFB50180);陕西省科技统筹创新工程计划项目(2013KTLM-01)

摘　　要：利用Gleeble-3800热模拟实验机,在应变速率在0.001 s^(-1)~1 s^(-1)以及变形温度在750℃~950℃范围内对Ti555211合金进行等温恒应变速率压缩实验.系统研究了Ti555211合金热加工过程中流变应力行为.结果表明:应变速率对真应力—真应变曲线形状有较为显著的影响,其中,在高温低应变速率的加工条件下,由于动态软化过程的加强,流变应力曲线较为平缓.在高应变速率下合金呈现出不连续屈服现象,且在变形温度较高时更加明显,采用动态理论解释了该现象,为新型近β钛合金Ti555211热加工工艺的制定提供了科学依据,也具有重大的理论价值和工程意义.The isothermal compression tests of Ti-555211 titanium alloy has been conducted on a Gleebe-3800 hot-simulator at the strain rate ranging from 0. 001 s-1 to 1 s1 and the deformation temperature ranging from 750 ℃to 950 ℃. In this paper, the hot compression behavior of Ti555211 alloy was systematically investigated. The result shows that the strain rate has a sig- nificant effect on the shape of the true stress-true strain curve, and the flow stress curve is more gentle under the condition of high temperature and low strain rate because of the dynamic sof- tening process. High strain rates may lead to discontinuous yielding during deformation, and the severity of this yielding increases with increasing deformation temperature. This phenome- non is explained by the dynamic theory, and it provides a scientific basis for the development of hot processing technology for new near β titanium alloy Ti555211, and also has great theoretical value and engineering significance.

关 键 词：Ti555211合金 本构方程 近Β钛合金 

分 类 号：TG146.23[一般工业技术—材料科学与工程]