基于自洽模型的置氢Ti6Al4V合金流动应力预测  

Flow Stress Prediction of Hydrogenated Ti6Al4V Alloy Based on Self-Consistent Model

作　　者：牛勇 王耀奇 牛嘉伟 朱艳春[1] Niu Yong;Wang Yaoqi;Niu Jiawei;Zhu Yanchun(School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;AVIC Manufacturing Technology Institute,Beijing 100024,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

出　　处：《稀有金属材料与工程》2022年第7期2499-2506,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(52075509);太原科技大学博士启动基金(20192007,20202050)。

摘　　要：对不同置氢量Ti6Al4V合金在Gleeble-1500热模拟试验机上进行了等温压缩实验,实验温度为750、800、850、900、950和1000℃,应变速率为1s^(-1)。结果表明,Ti6Al4V合金的流动应力随置氢量增加先减小后增大,变形温度为750、800和850℃时,置氢量0.31%(质量分数,下同)合金流动应力最低;变形温度为900、950、1000℃时,流动应力最小值对应的置氢量分别为0.17%、0.1%和未置氢。基于自洽模型建立了置氢Ti6Al4V合金高温变形本构模型,该模型通过调整氢对β相的强化作用和氢对β相转变温度的降低反映置氢对Ti6Al4V合金流动应力的影响。与实验结果对比表明,所建立的本构模型可以准确预测流动应力随置氢量和变形温度的变化。The isothermal compression tests of hydrogenated Ti6Al4V alloy at deformation temperature s of 750, 800, 850, 900, 950 and 1000 ℃ and strain rate of 1s^(-1) were carried out on a Gleeble-1500 thermal simulator. The results show that the flow stress of Ti6Al4V alloy decreases first and then increases with the increase of hydrogen content. When the deformation temperature is 750, 800 and 850 ℃,the flow stress of alloy at hydrogenation content of 0.31wt% is the lowest. When the deformation temperature is 900, 950 and 1000 ℃, the hydrogenation content corresponding to the minimum flow stress is 0.17%, 0.1% and as received, respectively. The high temperature deformation constitutive model of hydrogenated Ti6Al4V alloy was established based on the self-consistent model. The model reflects the effect of hydrogen on the flow stress of Ti6Al4V alloy by adjusting the strengthenin g effect of hydrogen on β phase and reducing the transition temperature of β phase. Compared with the experimental results, it is shown that the model can predict the variation of flow stress with hydrogenation content and deformation temperature well.

关 键 词：置氢 TI6AL4V合金 高温变形 本构模型 

分 类 号：TG146.23[一般工业技术—材料科学与工程]