<strong>Ti-62A</strong>合金动态软化速率异常的热力学解释及其应变补偿本构方程

doi:10.11901/1005.3093.2019.541

材料研究学报

2020, Vol. 34

Issue (6): 401-409 DOI: 10.11901/1005.3093.2019.541

研究论文

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Ti-62A合金动态软化速率异常的热力学解释及其应变补偿本构方程

王敬忠¹^,²(

), 丁凯伦¹, 杨西荣¹^,², 刘晓燕¹^,²

1.西安建筑科技大学冶金工程学院西安 710055
2.西安建筑科技大学陕西冶金工程技术研究中心西安 710055

Thermodynamical Explanation for Abnormal Dynamic Softening Rate of Ti-62A Alloy and Constitutive Equation of Strain Compensation

WANG Jingzhong¹^,²(

), DING Kailun¹, YANG Xirong¹^,², LIU Xiaoyan¹^,²

1.College of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi’an 710055, China
2.Shaanxi Metallurgical Engineering Technology Research Center, Xi'an University of Architecture and Technology, Xi'an 710055，China

引用本文:

王敬忠, 丁凯伦, 杨西荣, 刘晓燕. Ti-62A合金动态软化速率异常的热力学解释及其应变补偿本构方程[J]. 材料研究学报, 2020, 34(6): 401-409.
Jingzhong WANG, Kailun DING, Xirong YANG, Xiaoyan LIU. Thermodynamical Explanation for Abnormal Dynamic Softening Rate of Ti-62A Alloy and Constitutive Equation of Strain Compensation[J]. Chinese Journal of Materials Research, 2020, 34(6): 401-409.

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摘要:

使用Gleeble-3800 热模拟试验机研究了Ti-62A合金在变形温度为800~950℃、应变速率为0.001~10 s^-1条件下的热压缩变形行为。结果表明，随着变形温度的提高出现Ti-62A合金的动态软化率降低的反常现象。(α+β)双相钛合金中Mo、Cr等β稳定元素的原子活性随着温度的升高而逐渐降低和β相比例增大，Jmatpro软件的热力学计算表明(α+β)双相钛合金的这一现象与此有密切关系。而α钛合金和β钛合金出现动态软化速率降低，与加工温度升高β相比例增大的关系更密切。从800℃升高到950℃，Ti-62A合金中β相的比例由32.1%提高到84.3%，Mo、Cr活性的降幅均达到64%。这些因素使变形过程中Ti-62A合金的晶界迁移速度和动态软化速率均随变形温度升高而降低，其950℃的真应力-应变曲线多为典型的动态回复型。α相的含量随着变形温度的提高而降低，且在较高的变形温度下β相的晶粒尺寸也较为粗大。构建的基于应变补偿的Ti-62A合金Arrhenius变形抗力模型，能较好地预测合金的流变应力行为，其相关系数R达到0.990，预测值与实测值的平均相对误差为8.983%。

关键词 ：金属材料, Ti-62A合金, 热压缩, 合金元素活度计算, 微观组织, 应变补偿的本构方程

Abstract：

The hot compression deformation behavior of Ti-62A alloy was investigated via Gleeble-3800 thermal simulator by strain rate of 0.001~10 s^-1 at 800~950℃. The results show that the dynamic softening rate of Ti-62A alloy decreased with the increase of deformation temperature. This phenomenon existed in the thermal processing of other biphasic titanium alloy, α-titanium alloy and β-titanium alloy. According to the thermodynamic calculation results by Jmatpro software, the phenomenon of (α+β) biphasic titanium alloy is closely related to the decrease of the atomic activity of the main alloy elements Mo, Cr and other β stable elements with the increase of temperature and the increase of β phase ratio. The reason for the decrease of dynamic softening rate of α-titanium alloy and β-titanium alloy is more closely related to the increase of the β phase ratio with the increase of processing temperature. When the temperature rose from 800℃ to 950℃, the proportion of β phase in Ti-62A alloy increased from 32.1% to 84.3%, and the activity of Mo and Cr decreased by 64%, which thereby results in the decrease of grain boundary migration rate and dynamic softening rate of Ti-62A alloy. The true stress-strain curve at 950℃ is mostly a typical dynamic recovery type. The content of α phase decreases with the increase of deformation temperature, and the β grain size is relatively large at higher deformation temperature. The Arrhenius deformation resistance model of Ti-62A alloy was constructed based on strain compensation, with which the rheological stress behavior of Ti-62A alloy can be predicted well, correspondingly, the correlation coefficient R is 0.990, and the average relative error between the predicted value and the measured value is 8.983%.

Key words： metallic materials Ti-62A alloy hot compression activity calculation of alloying elements microstructure constitutive equation of strain compensation

收稿日期: 2019-11-18

ZTFLH:

TG146.2+3

基金资助:国家自然科学基金(51474170)

作者简介: 王敬忠，男，1974年生，副教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.541 或 https://www.cjmr.org/CN/Y2020/V34/I6/401

表1 Ti-62A钛合金的化学成分

图1 实验用Ti-62A合金的原始组织

图2 在不同变形条件下Ti-62A合金的流变应力曲线

图3 钛合金中合金元素的活性随温度的变化

图4 钛合金中α相和β相的比例随温度的变化

图5 在应变速率为 0. 001 s-1、不同温度条件下热压缩变形后Ti-62A 合金的显微组织

图6 在应变速率为1 s-1、不同温度条件下变形的Ti-62A合金的显微组织

表2 Ti-62A合金常数拟合参数

图7 应变补偿的本构方程模拟流变应力曲线与实验流变应力曲线

图8 Ti-62A合金的应变补偿方程计算值与实测流变应力值的相关性

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