Research on the Effect of Liquid Nitrogen Cryogenic Treatment on Residual Stress of 2195 Al-Li Alloy
Liquid nitrogen cryogenic treatment can improve the mechanical properties of materials and reduce residual stress.In this study,by collecting temperature gradients during the cryogenic treatment process of 2195 Al-Li alloy materials,the heat transfer coeffi-cients of each process were obtained.A predictive model for the evolution of residual stress in 2195 aluminum-lithium alloy with liq-uid nitrogen cryogenic treatment was established,and the effect of cryogenic treatment on material strain and stress was analyzed.The layer removal method residual stress testing technique was also used to test the internal residual stress of the materials,confirming the re-duction effect of liquid nitrogen cryogenic treatment on residual stress.The research results show that compared to the quenched state,the compressive true strain on the surface and in the core of the material decreases after cryogenic treatment,the difference in plastic strain between the surface and core decreases,the peak compressive stress on the surface decreases by 5.9%,and the peak tensile stress in the core decreases by 13.1%.Cryogenic treatment can reduce the level of residual stress in materials.
万方数据
维普
