Hot Deformation Behavior and Constitutive Model of Powder Forming Zr-2 Alloy
The hot compression experiments of powder forming Zr-2 alloy at the temperature of 650-850℃and the strain rate of 0.001-5 s-1 were carried out by Gleeble-1500 thermal simulation machine to study its hot deformation behavior.Based on the experimental data of hot compression,the strain modified Arrhenius equation was used to construct the deformation constitutive model of powder forming Zr-2 alloy.The results show that the deformation temperature has an obvious effect on the flow stress of powder forming Zr-2 alloy,and the flow stress of material decreases greatly with the increases of deformation temperature.At the same time,the thermal deformation flow stress of powder forming Zr-2 alloy is sensitive to strain rate,that is,the deformation resistance increases with the increase of strain rate,but the deformation resistance does not increase significantly at low temperature(650,700℃)and high strain rate(5 s-1).The constitutive equation of powder forming Zr-2 alloy based on the strain-modified Arrhenius equation has a correlation coefficient of 0.9827,which can predict the flow stress of the material accurately.
Zr-2 alloypowder forminghot deformation behaviorconstitutive model
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