<strong>TA5</strong>钛合金的应变补偿物理本构模型和加工图

doi:10.11901/1005.3093.2021.241

材料研究学报

2022, Vol. 36

Issue (3): 175-182 DOI: 10.11901/1005.3093.2021.241

研究论文

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TA5钛合金的应变补偿物理本构模型和加工图

王俊¹, 王克鲁¹(

), 鲁世强¹, 李鑫¹, 欧阳德来², 邱仟¹, 高鑫¹, 张开铭¹

^1.南昌航空大学航空制造工程学院南昌 330063
^2.南昌航空大学材料科学与工程学院南昌 330063

Strain Compensation Physical Constitutive Model and Processing Map of TA5 Titanium Alloy

WANG Jun¹, WANG Kelu¹(

), LU Shiqiang¹, LI Xin¹, OUYANG Delai², QIU Qian¹, GAO Xin¹, ZHANG Kaiming¹

^1.School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China
^2.School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China

引用本文:

王俊, 王克鲁, 鲁世强, 李鑫, 欧阳德来, 邱仟, 高鑫, 张开铭. TA5钛合金的应变补偿物理本构模型和加工图[J]. 材料研究学报, 2022, 36(3): 175-182.
Jun WANG, Kelu WANG, Shiqiang LU, Xin LI, Delai OUYANG, Qian QIU, Xin GAO, Kaiming ZHANG. Strain Compensation Physical Constitutive Model and Processing Map of TA5 Titanium Alloy[J]. Chinese Journal of Materials Research, 2022, 36(3): 175-182.

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摘要:

使用Gleeble-3800热模拟试验机对TA5钛合金进行等温恒应变速率压缩，研究其在变形温度为850~1050℃、应变速率为0.001~10 s^-1和最大变形量为60%条件下的高温热变形行为；建立了引入物理参量的应变补偿本构模型，并根据DMM模型得到了加工图。结果表明：TA5钛合金为正应变速率敏感性和负变形温度相关性材料；考虑物理参量的应变补偿本构模型具有较高的预测精度，其相关系数R为0.99，平均相对误差AARE为8.95%。分析加工图和观察微观组织，发现失稳区域(850~990℃，0.05~10 s^-1)的主要变形机制为局部流动；稳定区域(870~990℃，0.005~0.05 s^-1)的主要变形机制为动态回复和动态再结晶。TA5钛合金的最佳热加工工艺参数范围为870~990℃和0.005~0.05 s^-1。

关键词 ：金属材料, TA5钛合金, 高温变形行为, 物理本构, 加工图, 工艺参数优化

Abstract：

The thermal deformation behavior of TA5 Ti-alloy was investigated via Gleeble-3800 thermal simulation machine in temperature range of 850~1050℃ by strain rate within 0.001~10 s^-1, while the maximum deformation of 60%; A strain compensation constitutive model in consideration of the relevant physical parameters was established, and the processing diagram was obtained according to the DMM model. The results show that: TA5 Ti-alloy is a kind of material with positive strain rate sensitivity and negative deformation temperature dependence; By taking physical parameters into account, the established strain compensation constitutive model has high prediction accuracy with a correlation coefficient R of 0.99, while the average relative error AARE is 8.95%. It was found that the main deformation mechanism in the instability zone (850~990℃, 0.05~10 s^-1) was local flow, which accords well with the analysis result of processing diagram coupled with observation of the microstructure; The deformation mechanisms in the stable region (870~990℃, 0.005~0.05 s^-1) are mainly dynamic recovery and dynamic recrystallization. It follows that the optimal processing parameters for thermal deformation of TA5 Ti-alloy are 870-990℃ and 0.005~0.05 s^-1.

Key words： metal material TA5 titanium alloy high temperature deformation behavior physics constitutive processing map optimal process parameter

收稿日期: 2021-04-15

ZTFLH:

TG146.23

基金资助:国家自然科学基金(51761029);南昌航空大学研究生创新专项基金(YC2020026)

作者简介: 王俊，男，1996年生，硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.241 或 https://www.cjmr.org/CN/Y2022/V36/I3/175

图1 TA5钛合金的原始组织

图2 TA5钛合金在不同变形条件下的流变应力曲线

图3 TA5钛合金在不同变形条件下的峰值应力

D₀/

m²·s^-1

Q_sd/

J·mol^-1

G₀/

MPa

E₀/

GPa

T_m/

T m G 0 d G d T

1.5×10^-4

2.91×10⁵

4.36×10⁴

126

1933

-1.2

表1 合金的相关材料参数

图4 在850≤T≤950℃条件下的材料常数α、n、lnB与ε的六次多项式拟合关系

图5 在950＜T≤1050℃条件下的材料常数α˙、n˙、lnB?与ε的七次多项式拟合关系

图6 TA5钛合金在不同变形温度的流变应力预测值与实验值的对比

图7 TA5钛合金不同应变下的加工图

图8 TA5钛合金在稳定区域的微观组织

图9 TA5钛合金在失稳区域的微观组织

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