3D FE Analysis of Induced Residual Stresses and Forming Temperature in Hot Rolled AZ31 Mg Alloy
Jabbar Gattmah*, Suha K. Shihab, Muzher Taha Mohamed
Department of Material Engineering, College of Engineering, University of Diyala, 32001, Baqubah, Diyala, Iraq
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The sheets rolled of Mg alloys are extremely appealing for using in a broad domain of applications due to their high strength corresponding to their low weight ratio. Therefore, in the current study, the sheet of AZ31Mg alloy (Type-B) rolled sheet in terms of residual stresses and forming temperature was analyzed. 3D finite element (3D FE) modeling of the hot rolling process was proposed to predict the impact of different rolling ratios and coefficients of friction on the induced residual stresses. Besides, the effect of various initial sheet temperatures and rolling ratios on the forming temperature was estimated. The experimental validations in terms of rolling time vs different friction coefficients as well as the surface temperature vs duration in roll bite were considered to demonstrate the consistency between modeling and experimental models. The study concluded that the rolling ratio strongly affects induced residual stresses with a little effect on forming temperature while the coefficient of friction has a slight effect on both of them. The results revealed that the change in initial sheet temperatures has an active impact on the enhancement of forming temperature then, the increase in formability of AZ31 Mg alloy. Furthermore, the proposed 3D FE modeling can upgrade the comprehension and applicability of the hot rolling process to improve the formability of the AZ31 Mg alloy sheets.