(1. 中航工业沈阳黎明航空发动机(集团)有限责任公司,沈阳 110000;
2. 中国科学院 金属研究所,沈阳 110016;3. 中国人民解放军驻黎明公司军代表室,沈阳 110043)
摘 要: 采用Gleebe-3800热模拟实验在变形温度900~960 ℃、应变速率为0.001~10 s-1条件下进行Ti55钛合金的热压缩变形实验。结果表明:Ti55钛合金的热压缩真应力—应变曲线表现为流变软化的特点,当变形温度降低或应变速率增加时,Ti55钛合金的流变应力也随之增加。通过对真应力—应变曲线的回归分析,建立了Ti55钛合金的流变应力本构方程,在本研究中的变形温度与应变速率下,Ti55钛合金的Zener-Hollomon参数Z= exp[3.926 7×105/(RT)] =A[sinh(5.107 5×105σ)]4.001 46。
关键字: Ti55高温钛合金;热压缩;流变应力;本构方程
(1. AVIC Shenyang Liming Aero-engine (Group) Co., Ltd, Shenyang 110000, China;
2. Division of Titanium Alloys, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
3. The PLA Military Representative Office in AVIC Shenyang Liming Aero-engine (Group) Co., Ltd,
Shenyang 110043, China)
Abstract:The hot compression deformation behavior of Ti55 alloy was investigated by hot compression testing on Gleeble-3800 thermal simulator at the temperature range of 900-960 ℃ with the strain rate varying from 0.001 s-1 to 10 s-1. The results indicate that the true stress—strain curves of Ti55 titanium alloy during hot compression show rheological softening characteristics. The flow stress increases when the deformation temperature decreases or the strain rate increases. Through the true stress—strain curve regression analysis, the flow stress constitutive equations of Ti55 titanium alloy is built and the Zener-Hollomon parameter of this alloy is Z= exp[3.926 7×105/(RT)] =A[sinh(5.107 5×105σ)]4.001 46.
Key words: Ti55 high temperature titanium alloy; hot compression; flow stress; constitutive equations