Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

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第30卷    第7期    总第256期    2020年7月

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文章编号:1004-0609(2020)-07-1611-09
Ti-Nb合金的物理基本构模型
刘建军1,王克鲁1,鲁世强1,李 鑫1,欧阳德来2,程 静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
)

摘 要: 采用Gleeble-3500型热模拟机对Ti-Nb合金在应变速率0.001~10 s-1,变形温度1063~1213 K条件下进行热压缩实验,得到流变应力曲线。首先采用综合考虑弹性模量(E)和材料自扩散系数(D)的物理基本构方程建立Ti-Nb合金传统的应变补偿本构模型,再对所建立的本构模型进行修正来提高预测该合金流变应力的能力,最后对修正的本构模型进行简化来进一步提升建立该物理基本构模型的效率。结果表明:传统的应变补偿本构模型的预测能力并不理想,经过修正和简化的本构模型拥有较高的预测精度且两者的预测能力几乎相同。

 

关键字: Ti-Nb合金;本构关系;热变形

Physically-based constitutive model of Ti-Nb alloy
LIU Jian-jun1, WANG Ke-lu1, LU Shi-qiang1, LI Xin1, OUYANG De-lai2, CHENG Jing1

1. School of Aerospace Manufacturing Engineering, Nanchang Hang Kong University, Nanchang 330063, China;
2. School of Materials Science and Engineering, Nanchang Hang Kong University, Nanchang 330063, China

Abstract:The flow stress curves of Ti-Nb alloy were acquired by hot compressive tests on Gleeble-3500 thermo-simulation machine at the strain rate range of 0.001-10 s-1 and temperature range of 1063-1213 K. Traditional strain compensation constitutive model of Ti-Nb alloy was firstly established by the physically-based equation of elastic modulus (E) and material self-diffusion coefficient (D), and then modified it to improve the predicted ability of flow stress, finally simplified the modified constitutive model to improve the efficiency of building the physically-based constitutive model. The results show that traditional constitutive model does not have good predicted ability, and the prediction abilities of modified and simplified constitutive models are quite excellent and almost identical.

 

Key words: Ti-Nb alloy; constitutive relationships; hot deformation

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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