Effects of Heat Treatments on the Microstructure and Property of 2219 Aluminum Alloy Thin-walled Spun Tube
In this paper,three different heat treatments were carried out on the spun tube of 2219 aluminum alloy,and the microstructure,tensile property and hydro-bugling limit after heat treatment were characterized.The influence of heat treatments on microstructure and properties was studied.Results showed that the recovery was dominant when annealed below 400 ℃,and recrystallization occurred when annealed at 450 ℃.As the annealing temperature increased,the matrix microstructure gradually evolved from deformed microstructure to recrystallized microstructure.Under the condition of solution treatment,the recrystallization degree increased gradually and the dislocation density decreased with the increasing holding time.The hardening rate and elongation of the tubes were significantly improved,and the tensile strength increased gradually with the increasing annealing and solution treatment temperature.After solution treatment at 530 ℃,the tensile strength and elongation were 340 MPa and 25％,respectively.After solution and aging treatment,the tensile strength further increased to 435.2 MPa.The bulging limit of the tube increased with the heat treatment temperature.The solid solution treated 2219 aluminum alloy spun tube had good hydro-bugling capacity and was suitable for hydroforming.
2219 aluminum alloyspun tubeheat treatmentmicrostructure and propertyhydroforming
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