Study On Deformation Behavior And Microstructure Of AZ80 Magnesium Alloy Fabricated By Hot Flow Forming

For the present paper,the AZ80 magnesium alloy was conducted.Based on the plane strain compression,the Arrhenius Constitutive model and less parameter Constitutive model were established and were input in ABAQUS/Explicit software to simulate the hot flow forming process of AZ80 magnesium alloy.The metal sample was embedded in the inner wall of AZ80 magnesium alloy tube to study the deformation behavior,texture evolution and dynamic recrystallization along the radial reduction during hot flow forming by combing the simulation results and experiment results.The main conclusions were summarized as follows:When the strain rate is 0.03s^-1-0.1s^-1,both Arrhenius Constitutive model and less parameter constitutive model based on creep equation have high precision with the standard deviation of 2.8%and 3.77 respectively.When the strain rate is 0.0003s^-1,the less parameter constitutive model had better performance with the standard deviation of 6.2%.Input these two Constitutive models into ABAQUS/Explicit software to simulate plane strain compression and get the distribution of normal strain in three axils.The results showed the experiment results were consistent with the simulation results.Compare the flow forming simulation results and flow forming experiment with embedded sample,the distribution of strain from experiment results was consistent with the simulation.After flow forming,the material undergoes the compression strain,tensile strain and tensile strain alone the radial reduction,tangential reduction and axial direction.And the strain of outer surface is bigger than that in inner surface which lead to metal accumulation in front of the roller.The orientation of recrystallization grain succeeds the orientation of initial coarse grain and evolved into flow forming texture gradually.According to the simulation results,the orientation of the maximum principal compressive stress leads to a discrepancy of the grain orientation along radial directions.When the reduction is 25%,the flow forming texture was formed in the inner surface and outer surface but the completely dynamic recrystallization only happened in outer surface.When the reduction is 45%,the flow forming texture and completely dynamic recrystallization can be observed both in outer surface and inner surface.