Computation Model And Confirmation Of Magnesium Alloy AZ91D Inverted Extrusion Dynamic Recrystallization Size

The magnesium alloy has many fine characteristics, so it's widely used in recent years. Craft of traditional casting magnesium which is difficulty satisfied in the request of actual production to the performance of magnesium alloy work piece. Therefore the craft of plastic processing magnesium alloy's receives more and more attentions. The dynamic recrystalIization size is important attribute affects the performance of the plastic processing work piece, so the simulation of dynamic recrystalIization size's is helpful to the improvement craft and enhances the work piece performance. This article has realized to the magnesium alloy AZ91D tube inverted extrusion dynamic recrystalIization size simulation by equation development, experiment, simulation and to simulator re-development.First,infer the dynamic recrystalIization activation energy expression by unify the Zener-Hollomon parameter and the hyperbolic sine model. Inquires into the AZ91D magnesium alloy the dynamic recrystalIization activation energy by obtains the peak stress which and the peak value strain according to the Gleeble-1500D thermal simulation machine the AZ91D magnesium alloy hot extrusion distorts. Inquires into the AZ91D magnesium alloy inverted extrusion dynamic recrystalIization crystal grain size formula by the AZ91D magnesium alloy dynamic recrystalIization activation energy.Second, carries on the AZ91D magnesium alloy inverted extrusion tube experiment. Get the actual inverted extrusion process dynamic recrystalIization size distributed situation by the sample picture of crystal. Carries on the DEF0RM-3D numerical simulation to the magnesium alloy inverted extrusion experiment, obtains the sample spot distortion parameter as the strain, the strain speed and the temperature.Third, The dynamic recrystalIization size, the strain, the strain speed and the temperature substitution dynamic pure crystal grain size formula, fits the AZ91D magnesium alloy material constant, completes the AZ91D magnesium alloy dynamic recrystalIization size formula the inferential reasoning.Last, the FORTRAN language carries on the development to the DEF0RM-3D simulator. Inducts the simulator of AZ91D magnesium alloy's inverted extrusion dynamic recrystalIization ultimate strain formula and the dynamic recrystalIization size formula, enables it to have judges the AZ91D magnesium alloy whether to have the dynamic recrystalIization and the computation dynamic recrystalIization crystal grain size function.