Abstract
The deformation behavior of the continuous multi-pass hot rolling AZ31B sheets is tested in a Gleeble 1500 thermo-mechanical simulator. The evolution of microstructure during the deformation process is observed and the constitutive relation of AZ31B alloy is analyzed by a finite element method. The results show that the deformation behavior of continuous multi-pass hot rolling of AZ31B sheets is totally different with that of single pass rolling. The work hardening mechanism plays a more important role than the dynamic recrystallization does during the continuous multi-pass deformation process under different strain rates from 0.01 s^-1 to 5 s^-1. The calculated value of high temperature deformation activation energy of hot rolling AZ31B sheets is 171 kJ/mol. The FEM simulation provides a detailed distribution of temperatures, stress and equivalent strains in the continuous multi-pass rolling sheet.

Key words
magnesium alloys, finite element analysis, rolling, thermo-mechanical processing

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