Constitutive relationship of IN690 superalloy by using uniaxial compression tests
来源期刊：Rare Metals2011年第1期
论文作者：WANG Guojuna,b,ZHANG Shunhaib,MIAO Xiaochunb,GUO Yuna,and LU Guanzhonga a Key Laboratory for Advanced Materials and Research Institute of Industrial Catalysis,East China University of Science and Technology,Shanghai ,China b Shanghai Research Institute of Petrochemical Technology,China Petroleum & Chemical Corporation,Shanghai ,China
文章页码：81 - 86
摘 要：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-1 using 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-1 to 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,n and ln A） 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.
SUN Chaoyanga,LIU Jinronga,LI Ruia,ZHANG Qingdonga,and DONG Jianxinb a School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China;b School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China
摘 要：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-1 using 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-1 to 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,n and ln A） 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.
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