Forging Deformation Behavior And Evolution Of Microstructure And Properties On 6082 Aluminum Alloy Control Arm

The control arm is a key component of the automobile chassis.In order to meet the demand for light weight,forging control arms using aluminum alloy materials has become an industry trend.However,the aluminum alloy forming process is complicated and the production time is long.The problems of low utilization rate of die forging materials need to be solved urgently.This paper mainly studies the forming process of aged 6082 aluminum alloy,and study the effect of deformation on the change of mechanical properties,reveal the law of organization change,provide theoretical basis for ageing aluminum alloy forming.According to the specific problems of the forging of the control arm,a new method for forming the control arm of aluminum alloy is proposed.Study the forming process with the help of finite element software to effectively improve production efficiency.The compression forming behavior and microstructure evolution of 6082 aluminum alloy with T6 peak ageing state were studied.With the increase of heating temperature during forming,the mechanical properties of the sample gradually decreased after forming.Increasing the heating temperature will promote the growth and transformation of the precipitated phase,it transited from β′′→β′ →β phase.The strengthening effect weakens in turn.At the same time,the higher the temperature,the stronger the dynamic recovery and recrystallization during the deformation process,the lower the dislocation density.When the heating temperature is 200 °C,the formed sample has similar grain size as the sample before forming.The precipitated phase β′′is coarsened in a small amount,and a large number of dislocations are introduced at the same time.It has good mechanical properties near the peak age of T6 state.This article further studies the deformation behavior of 6082 aluminum alloy under underpeak aging.The effects of different pre-aging processes and different compression deformation temperature and time on the mechanical properties of the samples were analyzed.The results show that when the samples aged at 120 °C + 4h are thermally formed at 200 °C,the formed samples have good mechanical properties.Based on the differential scanning calorimetry(DSC)heating curve,the effects of different pre-aging treatment processes on the precipitation and evolution of the precipitated phase were analyzed,and the changes of the precipitated phase during the pre-aging treatment and compression forming process were revealed.Furthermore,the reason for the difference in mechanical properties of the samples after deformation was explained.A control arm forming process using under-age aging 6082 aluminum alloy as the material was established.Designed control arm forging die according to forging picture.A constitutive model of 6082 aluminum alloy with 120 °C + 4h under-aging treatment was established at 200 °C to 350 °C.Import the established constitutive equation into the finite element software Deform-3D,simulated the whole process of forging from flattening to upsetting-pre-forging to final forging.According to the simulation results,the metal flow rule during the forming process was analyzed,and the mold was optimized accordingly.Analysis of temperature,equivalent stress,load and streamline changes during forging.According to the analysis results,the heating temperature before forging was optimized and the forming defect area was predicted.Based on the research law of aluminum alloy forming and phase transformation structure and the results of finite element simulation analysis.The 6082 aluminum alloy control arm has been produced successfully.