科研之友
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摘要
In a wide range of deformation conditions, hot compression tests of AZ31B magnesium alloy cast cylinder were carried out by Gleeble-1500D thermal simulator. According to the strain softening characteristics of magnesium alloy, a new thermal deformation constitutive model was established. Relying on Deform-3D, the coupled thermal-stress simulation of hot rolling process of magnesium plate was analyzed. Based on the rolling theoretical assumptions, macroscopic continuum mechanics and thermodynamics, strain and strain rate value distribution models, three-dimensional temperature field and stress field mathematical models in rolling deformation zone were established by a mathematical analysis method. The results show that the new thermal constitutive model is in a higher accuracy and the average relative error is 5.1%. Strain distribution model; strain rate value distribution model, mathematical model of temperature field and mathematical model of stress field are concise in form and easy to be controlled online; furthermore, they could accurately characterize thermal-mechanical coupled deformation mechanism of hot rolling of magnesium plate.
