Based On Deform-3d 7050 Aluminum Alloy Forging Forming Process And Grain Size Evolution

Aluminium alloy die forging piece is increasingly applied in aircraft component, and it's capability lie on the microstructure of the die forging piece during hot working process .The study to the forging process and the law of the microstructure for aluminium alloy big forging piece have important meaning to the forming of the aircraft component.In this paper, the process of free forging and die forging for 7050 aluminium alloy was simulated on the platform of DEFORM-3D, and the microstructure module was applied to simulate the law of the microstructure evolution. The main contents are as follows:Isothermal compression tests of 7050 aluminum alloy under different distortion parameter were performed on Gleeble-1500 thermal simulator. The influence of the hot deformation parameter to the flow stress and the dynamic recrystallization were studied, and the steady flow stress module was proposed. The results show that the flow stress decreased with the increase of the deformation temperature and increased with the increase of strain rate. Dynamic recrystallization happened in the condition of high temperature and low strain rate.The microstructure of 7050 alluminium alloy using laboratory ingot casting and laboratory forging piece were obtained by the metallurgical experiment, and the cellular automaton module was proposed. The results show that the dynamic recrystallization of 7050 aluminium alloy was compact with the deformation parameter, and the average grain size from 100um changed to 20um, and the dynamic recrystallization percent reached 60%.The free forginng of 7050 aluminium alloy big forging piece was simulated on the platform of DEFORM-3D, and the microstructure evolution during forging was simulated using the cellular automaton (CA) module. The simulation results show that the capability of 7050 aluminium alloy big forging piece was greatly improved during free forging, and the dynamic recrystallization happened during the free forging. By means of multiple-stretching process, the refined and uniformed DRX grains can be obtained, and the simulation results agree well with the industrial result.The die forging of 7050 aluminium alloy big forging piece was simulated on the platform of DEFORM-3D, and the flow-net module was applied to analyze the metal streamline, the affection of die velocity, deformation temperature and friction gene to the big forging piece was analyzed during the die forging. The results show that the deformation temperature have great influence to the forming of die forging piece, and the big die forging piece formed well in the condition of high temperature and low friction gene. Deformation temperature in 450℃, friction gene in 0.2,deformation velocity in 15mm/s was a perfect deformation condition.