Constitutive relationship of IN690 superalloy by using uniaxial compression tests
Constitutive relationship of IN690 superalloy by using uniaxial compression tests
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DOI：
10.1007/s12598-011-0202-z
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发表时间：
2011-02
期刊：
影响因子：
8.8
通讯作者：
Chaoyang Sun;Jinrong Liu;Rui Li;Qingdong Zhang;Jian-Xin Dong
中科院分区：
文献类型：
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作者：
Chaoyang Sun;Jinrong Liu;Rui Li;Qingdong Zhang;Jian-Xin Dong
在1273-1473 K的温度范围和0.01-10 s-1的应变速率范围内，使用对工艺退火材料的单轴压缩试验来表征IN 690高温合金的热变形行为。研究了流变应力与等效应变、等效应变速率和变形温度的本构关系。结果表明，IN 690高温合金的流变应力随变形温度的升高而显著降低。而当应变速率从0.1 s-1增加到10 s-1时，流变应力显著增加。基于双曲正弦Arrhenius型方程，建立了考虑应变补偿的本构方程。激活能和材料常数（Q，Δ lnA）随变形量的增加而减小。通过四次方程成功地将应变相关项纳入本构方程中。实验结果与预测结果吻合较好，表明所提出的本构方程和材料常数的确定方法适用于模拟IN 690高温合金的高温变形行为。
The hot deformation behavior of IN690 superalloy was characterized in a temperature range of 1273–1473 K and a strain rate range of 0.01–10 s−1using uniaxial compression tests on process annealed material. The constitutive relations between flow stress and effective strain, effective strain rate as well as deformation temperature were studied. It can be concluded that the flow stress significantly reduces with the deformation temperature of IN690 superalloy increasing. Whereas, there is a significant increase of flow stress when the strain rate increases from 0.1 s−1to 10 s−1. Based on the hyperbolic-sine Arrhenius-type equation, a constitutive equation considering compensation of strain was developed. The activation energy and the material constants (Q,nand lnA) decrease as the deformation strain increases. The strain dependent term is successfully incorporated in the constitutive equation through a quartic equation. A good agreement between the experimental data and the predicted results has been achieved, indicating that the proposed constitutive equation and the methods of determing the material constants are suitable to model the high temperature deformation behavior of IN690 superalloy.