Ti60高温钛合金的热变形行为Ⅰ:本构方程  

Hot deformation behavior of Ti60 high temperature titanium alloy.Ⅰ:Constitutive equations

作　　者：冯秋元[1,2] 郭佳林[1,2] 杨军[2] 陈秉刚[2] 佟学文 王俭[1] FENG Qiu-yuan;GUO Jia-lin;YANG Jun;CHEN Bing-gang;TONG Xue-wen;WANG Jian(Institute of Baoti,Baoti Group Co.,Ltd.,Baoji 721014,China;Institute of Baoti,Baoji Titanium Industry Co.,Ltd.,Baoji 721014,China)

机构地区：[1]宝钛集团有限公司宝钛研究院,陕西宝鸡721014 [2]宝鸡钛业股份有限公司宝钛研究院,陕西宝鸡721014

出　　处：《塑性工程学报》2021年第11期158-166,共9页Journal of Plasticity Engineering

基　　金：国防项目(S15-GG-17-06-1)。

摘　　要：采用Gleeble-3800热模拟试验机对Ti60钛合金进行了热压缩实验,研究该合金在变形温度800~1150℃和应变速率0.001~1 s^(-1)区间内的热变形行为。结果表明:变形温度和应变速率是决定Ti60钛合金流变应力大小的主要因素,随变形温度升高,应变速率降低,流变应力减小,表现出较强的温度敏感性和应变速率敏感性;随应变增大,合金的流变应力达到最大值,之后趋于平稳,呈现出流变软化特征。采用双曲正弦模型确定合金在800~900℃、950~1020℃和1050~1150℃的变形激活能分别为545.82、732.78和116.19 k J·mol^(-1),进而建立了合金在不同温度区间变形的本构方程,为制定和优化最佳形变加工工艺提供了理论依据。The hot compression test of Ti60 titanium alloy was carried out on Gleeble-3800 hot simulator,and the hot deformation behaviors of Ti60 titanium alloy at the temperature range of 800-1150℃and the strain rate range of 0.001-1 s^(-1) were researched.The results show that the deformation temperature and strain rate are the main factors that determine the flow stress of Ti60 titanium alloy.With the increase of deformation temperature and the decrease of strain rate,the flow stress decreases,which presents strong temperature sensitivity and strain rate sensitivity.With the increase of strain,the flow stress of alloy reaches the maximum value,and then goes to stable,after that,shows the characteristic of flowing softening.The deformation activation energy of alloy is determined by the Hyperbolic sine model,namely,545.82,732.78 and 116.19 k J·mol^(-1) at 800-900℃、950-1020℃ and 1050-1150℃,respectively.Furthermore,the constitutive equations in different temperature ranges were established,which provide theoretical basis for making and optimizing the best deformation processing technology.

关 键 词：Ti60钛合金 热模拟 热变形行为 本构方程 

分 类 号：TG146.23[一般工业技术—材料科学与工程]