Study On Simulation And Microstructure And Properties Of Warm Rolling For AZ31B Magnesium Alloy

Magnesium alloys with good strength,ductility,and toughness are suitable for engineering applications.However,due to the dense hexagonal structure of magnesium alloys,the difficulty of processing and forming has hindered the largescale application of sheet and strip products.Therefore,developing efficient processing technology for magnesium alloy thin plates is crucial.Warm rolling is an effective forming method.By controlling the rolling temperature and reduction ratio reasonably,the sheet with good mechanical properties can be obtained while ensuring its formability.This article takes AZ31 B magnesium alloy thin sheet and strip as the research object,and combines crystal plasticity finite element simulation with experimental research to analyze the influence of rolling process on the texture evolution,microstructure,and mechanical properties of magnesium alloy thin sheet and strip.The main research content and conclusions are as follows:(1)A crystal plasticity constitutive model applicable to AZ31 B magnesium alloy was developed,and the developed constitutive relation was embedded into the ABAQUS main program using VUMAT to establish a crystal plasticity finite element model of AZ31 B magnesium alloy thin plate rolling process.(2)The single-pass warm rolling process of AZ31 B magnesium alloy thin plates was simulated,and the effects of process parameters such as rolling temperature and reduction on rolling force,stress-strain distribution,and slip and twinning deformation of grains with different initial orientations during rolling process were analyzed.(3)Using crystal plasticity finite element method,the texture evolution of AZ31 B magnesium alloy thin plates during warm rolling process was simulated,and the effects of process parameters such as rolling temperature and reduction on texture evolution were analyzed,and the ways to improve anisotropy by process optimization were explored.(4)Using a two-roll mill with temperature control function,single-pass warm rolling experiments were conducted on AZ31 B magnesium alloy with a thickness of 0.5mm at different temperatures and reduction ratios,and the microstructure observation and mechanical properties test were compared with the results of crystal plasticity finite element simulation,indicating that the established crystal plasticity finite element model can be used for simulation and analysis of plastic deformation mechanism and texture evolution during warm rolling process.