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Ti65钛合金热变形行为及本构方程

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利用WDW-100H万能试验机对Ti65钛合金进行了等温恒应变速率热压缩实验,变形温度为840～1010 ℃,应变速率为0.001～0.1 s-1,建立了应变补偿型Arrhenius本构方程和热加工图.结果表明:在840～880℃内流动应力曲线波动较大,在880℃时峰值应力与稳定后应力之间的降幅最小,为24％,对温度敏感性较大;在920～1010 ℃内流动应力曲线较为平稳,在920℃时峰值应力与稳定后应力之间的降幅最大,为30％,对温度敏感性较小.采用应变补偿型Arrhenius本构方程可以较好地预测Ti65钛合金在变形条件为840～1010 ℃和0.001～0.1s-1下流动应力的变化规律.根据相关系数R=0.994和平均相对误差eAARE=6.9％可以判断出该模型精度较高,平均应变速率敏感性指数m为0.31.在应变为1.0时建立热加工图,发现Ti65钛合金在低温高应变速率下可能会发生失稳,在低温低应变速率下会发生再结晶行为.最终得出Ti65钛合金的最佳热变形工艺参数,即温度区间为940～980℃,应变速率区间为0.01～0.001 s-1.
Hot deformation behavior and constitutive equation of Ti65 titanium alloy
Isothermal thermal compression experiments with constant strain rate of Ti65 titanium alloy were carried out by using WDW-100H universal testing machine,the deformation temperatures is 840-1010 ℃ and strain rates is 0.001-0.1 s-1,and the strain-compen-sated Arrhenius constitutive equation and hot processing maps were established.The results show that the fluctuation of flow stress curve is large in 840-880 ℃,and the drop of stress from peak stress to stable stress is the minimum at 880 ℃,which is 24％,and it is more sensitive to temperature;the flow stress curve is more stable in 920-1010 ℃,and the drop of stress from peak stress to stable stress is the maximum at 920 ℃,which is 30％,and it is little sensitive to temperature.The strain-compensated Arrhenius constitutive equation can better predict the flow stress evolution laws of Ti65 titanium alloy under the deformation conditions of 840-1010 ℃ and 0.001-0.1 s-1.According to the correlation coefficient R=0.994 and the average relative error eAARE=6.9％,it is indicated that the model accuracy is high.The average strain rate sensitivity index m is 0.31.The hot processing map with strain of 1.0 was established,and it is found that Ti65 titanium alloy may be instability at low temperature and high strain rate,and the recrystallization behavior happens at low tempera-ture and low strain rate.Finally,the optimal hot deformation process parameters of Ti65 titanium alloy were obtained as:temperature range of 940-980 ℃ and strain rate range of 0.01-0.001 s-1.

Ti65 titanium alloyhot deformation behaviorconstitutive equationhot processing map

李萍、许海峰、孟淼、虞仁海、薛克敏

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合肥工业大学材料科学与工程学院,安徽合肥 230009

Ti65钛合金 热变形行为 本构方程 热加工图

国家自然科学基金资助项目国家自然科学基金资助项目中央高校基本科研业务费专项资金资助项目中央高校基本科研业务费专项资金资助项目航空发动机高性能制造工信部重点实验室开放课题

5200514551975175JZ2022HGTB0281JZ2022HGQA0116HPM-2020-02

2024

10.3969/j.issn.1007-2012.2024.02.016

塑性工程学报
中国机械工程学会

塑性工程学报

CSTPCD北大核心
影响因子：0.46
ISSN：1007-2012
年,卷(期)：2024.31(2)
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