Research On Forming Law And Process Method Of 2219 Aluminum Alloy Ring Additive Rolling

2219 aluminum alloy is an Al-Cu-Mn series high-strength heat-treatable aluminum alloy.Because of its excellent welding performance,good low-temperature toughness,and stress corrosion cracking resistance,it is regarded as the third-generation material of the aerospace model and is widely used.It is used in the manufacture of new-generation launch vehicle arrow body structures,such as large-scale ring parts such as space rocket fuel tank transition rings.The traditional method of forming large-scale ring is "making big with large size",that is,after heating the large ingot,it is obtained through solid deformation by drawing and then it is punched to obtain the ring billet.Finally,the ring is rolled to obtain a large ring.Due to the large volume of the ingot and the uneven solidification speed,the more severe macrosegregation and central defects,the poorer the quality of the structure,the more difficult it is to guarantee the uniformity of the microstructure of the rolled ring.This subject uses 2219 aluminum alloy as the experimental material,combines the metal additive forming method with the ring rolling technology,proposes the aluminum alloy additive rolling technology,and realizes the interface healing and mechanical properties restoring of the ring blank unit through high temperature hot rolling forming.Among them,due to the reduced volume of the ring billet ingot unit,the problems of segregation and defects have been effectively improved,the quality of the ingot has been improved,and the uniformity of the structure of the formed ring and the strength and toughness of the structure have also been significantly improved.This project first carried out the hot compression forming experiment of 2219 aluminum alloy material.The optical microscope and scanning electron microscope(SEM)were used to study the different deformation temperature(360?510?),deformation amount(0?50%) and post-press holding time(0?2h).The influence of experimental parameters on the microstructure evolution of the interface and the healing effect of the interface;combined with characterization methods such as Energy Dispersive Spectrometer(EDS) to further analyze the evolution behavior of oxide at the interface under different experimental parameters;through mechanical tensile experiments to evaluate the interface healing under different process parameters Reliability.The results show that when the low deformation temperature and the low deformation amount,it is difficult for the interface to heal.With the increase of the deformation temperature and the deformation amount,the grain boundaries at the interface gradually pass through the crystal grains due to migration and recrystallization behavior.The interface can finally achieve interface healing and recovery of mechanical properties;the progress of post-press thermal insulation treatment is also beneficial to interface healing and performance improvement.By synthesizing the above experimental results,it is possible to determine the process parameters of 2219 aluminum alloy forming and forming effect.Based on the obtained process parameters,an additive rolling model of aluminum alloy ring is established in the ABAQUS finite element simulation software.The ring rolling process is simulated,and the stress and strain,forming effect and additive rolling of the ring are analyzed to obtaine the best experimental parameters of 2219 aluminum alloy ring additive rolling forming.Finally,the 2219 aluminum alloy additive ring was rolled and formed on a ring rolling machine,in order to obtain an aluminum alloy additive ring with good interface healing effect and uniform structure and performance,and provide a theoretical basis for the aluminum alloy large-sized additive ring.