The Study Of Friction Stir Processing Of A15083 Based On Numerical Simulation

A15083 due to having low density,high specific strength,and good welding performance,widely used in shipbuilding,aerospace and other fields.As a new solid state process based on the principle of friction stir welding(FSW),friction stir processing(FSP)has successfully obtained a fine grained microstructure in the stirred zone due to the intense plastic deformation and dynamic recrystallization,improving mechanical properties.Therefore,the study of friction stir processing of A15083 becomes very meaningful.In this paper,the friction stir processing of A15083 is analyzed by combining thermal compressing experiment and finite element simulation.The main contents as follows:Firstly,5083 aluminum alloy hot compression experiments are performed by using Gleeble-3800 thermal simulation machine.The flow strain curves were obtained at the temperature of 375℃～475℃ and the strain rate of 0.001s-1～1.0s-1.Then based on the real stress-strain curves,Origin software combination was used to fit the Arrhenius of A15083.It was observed that the flow stress generally increased with decreasing the temperature and increasing the strain rate.Secondly,finite element model and simulations of friction stir processing are carried out using DEFORM-3D software.The temperature distributions were analyzed under different rotational speeds,advancing speeds,shoulder diameters and tilt angles.It was found that the peak temperature increased with increasing the ration of ω/v.The temperature increased with increasing rotational speed,shoulder diameters and tilt angles,and with decreasing advancing speed.Finally,the grain size of the stirred zone was investigated under different processing parameters for the friction stir processing.The results show that the grain size near the top is found to be larger than it near the bottom.No obvious differences are found on grain size in both the Advancing Side and the Retreating Side;the average grain size of the FSP reduces with an increase in rotational speed,shoulder diameter and tilt angle,and a decrease in advancing speed.