The isothermal compression test of 2196 alloy was carried out by Gleeble-1500 isothermal simulator with deformation temperature from 430°C to 500°C and strain rate from 0.01s−1 to 10s−1. The results show that the stress-strain curves are stable flow for the most deformation parameters. These stable flow exhibit a good ductility of 2196 alloy, also confirmed by no crack on the edge of the compressed samples. The constitutive equation is established using exponential relationship and the average activation energy Q is189.2kJ/mol. Microstructure observation show that very few recrystallized grains at original grain boundaries and triple junctions for the all deformation parameters. It is clear that the dynamic recrystallization is difficult for the 2196 alloy suffered common thermal deformation, while the main microstructure evolution mechanism is dynamic recovery. At the same deformation temperature, the recrystallization fraction decreases with increased strain rate, while the proportion of subgrain increases. The recrystallization and dynamic recovery are two main factors for the microstructure characteristics.
The quenching residual stress in 7050 aluminum alloy thick plate was simulated by using the finite element method (FEM). And the FEM model was verified the experimental results. Then the effects of thickness and pre-stretching ratio on quenching residual stress were studied using the FEM model. The simulation results showed that the quenching residual stress increases gradually with the increase of thickness. The residual stress increased rapidly with the increase of thickness when the thickness between 40mm and 80mm. While the residual stress increased slowly when the thickness exceeds 80mm. The quenching residual stress decreased gradually with the increase of pre-stretching, but the decreasing extent slowed down gradually. When the pre-stretching amount exceeded 2.5%, the reduction ratio can be achieved more than 95.0%. Considering the efficiency of the reduction of quenching residual stress as well as the economy, the pre-stretching ratio should be set between 2.5% and 3.5%.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.