Heat treatment method for enhancing deformation properties of 2219 aluminum alloy T81-T845

Abstract

The invention discloses a heat treatment method for enhancing deformation properties of 2219 aluminum alloy T81-T845 and belongs to the field of alloy materials. The method comprises the following steps: solution treatment of test piece materials, preparation of various deformation quantity test pieces, aging treatment, mechanical property testing, and establishment of relation between various factors. According to the invention, correspondence between deformation quantity of 2219 aluminum alloy and aging technological parameters (such as aging temperature, aging time, etc.) is determined, a parameter model of the 2219 aluminum alloy thermomechanical treatment technological parameters can be determined rapidly and accurately, thus being convenient to choose corresponding heat treatment parameters according to actual deformation of a product (such as a melon petal part) in the production. The problem that there is no reference specification for product T8 heat treatment is solved. The relation graph obtained in the invention has strong relation graph adaptability. The method has a good application prospect. The application range of the 2219 aluminum alloy can be expanded.

Description

technical field [0001] The invention relates to a heat treatment method for improving the deformation performance of 2219 aluminum alloy T81-T845. Background technique [0002] The storage tank is one of the key structural parts of the model product. The material of the storage tank of the new generation of model products in my country is the first to use 2219 aluminum alloy, and the melon petal of the storage tank is one of the key structural parts of the model product. According to the technical requirements of XX-XC product development, The mechanical properties of melon parts must reach: tensile strength σb ≥ 420MPa, yield strength σ0.2 ≥ 320MPa, elongation δ ≥ 10%. [0003] The mechanical properties required by the above design should be higher than the technical indicators specified in the relevant standards (Table 1-1). In relevant standards such as GJB1694-93 "Specification for Heat Treatment of Deformed Aluminum Alloys", HB / Z276-95 "Heat Treatment of Deformed Alumin...

AI Technical Summary

Problems solved by technology

In relevant standards such as GJB1694-93 "Specification for Heat Treatment of Deformed Aluminum Alloys", HB / Z276-95 "Heat Treatment of Deformed Aluminum Alloy Parts", QJ / Z127-84 "Heat Treatment of Deformed Aluminum Alloys", only conventional heat treatment methods are introduced, such as T6 treatment (solid solution treatment and artificial aging, the parameters are the same, solid solution temperature 530℃~540℃, aging temperature 160℃~170℃); only in the standard YS / 591-2006 "Heat Treatment of Deformed Aluminum and Aluminum Alloys", The deformation heat treatment (T8) of 2219 aluminum alloy material is introduced, but only the aging parameters of T81 and T87 (deformation amounts are 1% and 7%) under two deformation states are given, which does not satisfy the actual forming of melon parts. The amount of deformation in the model has no guiding effect on the indicators of melon petal parts to be strengthened by heat treatment to meet the design requirements

The Chinese patent application number is 201310593472.8, and the title of the invention is "Method for Determining Deformation Heat Treatment Conditions for Improving the Performance of 2219 Aluminum Alloy". It discloses the T8 aging parameter with a deformation amount of 10%, but this patent has no general applicability and is instructive for special products. poor

[0006] In the initial stage of model development, the factory carried out relevant process tests on 2219 aluminum alloy plates by conventional heat treatment (T62), and the results showed that the mechanical properties could reach the results in Table 1-1, but the mechanical properties of the melon valve parts were far from the design requirements. Therefore, the T62 (quenching + artificial aging) heat treatment method cannot be adopted for 2219 aluminum alloy parts, and the deformation heat treatment (T8) technology can improve its mechanical properties, but there is no corresponding specification or parameter for reference

Images