A kind of preparation technology of 2a14 aluminum alloy high tube parts

Abstract

The invention discloses a preparation process of a 2A14 aluminum alloy high-cylinder part. The preparation process comprises the following steps that a 2A14 aluminum alloy ingot is heated in a resistance furnace to 475 DEG C-485 DEG C, and subjected to multi-directional forging on a hydraulic machine; a blank subjected to multi-direction forging is punched on the hydraulic machine; the blank subjected to punching is heated to 498 DEG C-502 DEG C, and heat preservation is carried out for 4-5 hours; hole expanding is carried out; a ring blank subjected to hole expanding is heated to 498-502 DEGC, and heat preservation is carried out for 4-5 hours; medium-temperature ring rolling is carried out, specifically, the ring blank obtained after high-temperature solid solution treatment is cooled to 200 DEG C-250 DEG C at room temperature, and then ring rolling is carried out, wherein the deformation amount is 25%-30%; and the heat treatment is carried out, so that the preparation of the 2A14 aluminum alloy high-cylinder part is completed. According to the preparation process, a coarse second phase is crushed and dissolved and the crystal grain is refined through middle-temperature mandrelsupporter hole expanding and medium-temperature ring rolling in combination with high-temperature solid solution heat treatment, the strength and plasticity of the high-cylinder part can be improved at the same time, high-performance manufacturing of the 2A14 aluminum alloy high-cylinder part is realized, and the mechanical property requirement of structural parts for spaceflight is met.

Description

technical field [0001] The invention belongs to the field of plastic processing and heat treatment of aluminum alloy materials, in particular to a high-performance manufacturing process capable of comprehensively improving the strength and toughness of large-scale 2A14 aluminum alloy high cylinder parts. Background technique [0002] 2A14 aluminum alloy is a heat-treatable and strengthened deformable aluminum alloy, which has the advantages of high strength, high plasticity and excellent weldability. It is an important structural material used in the manufacture of light-weight and high-strength alloy components in the aerospace field. With the gradual development of aerospace structural parts in the direction of integration, light weight and large size, extremely high requirements are put forward for its structural design and manufacturing performance. The large-scale 2A14 aluminum alloy high cylinder used in a certain type of strategic weaponry has a diameter of more than ...

AI Technical Summary

Problems solved by technology

The conventional traditional forming process of "460°C multi-directional forging billet opening + punching + 460°C horse frame hole expansion, mandrel elongation + 460°C continuous ring rolling" is used to manufacture tall tube parts, and the thickness is second in the process of plastic forming and heat treatment It is difficult for the phase to be fully broken and dissolved into the matrix. There are still a large number of coarse phases in the component and the distribution is uneven. Under high load, it will cause severe stress concentration around the coarse phase, and cracks are easy to occur, resulting in high overall mechanical properties of the cylinder. Unable to meet high performance index requirements (especially radial elongation)

In addition, ring rolling at 460 °C, due to the high temperature recovery and dynamic recrystallization that soften the matrix, the strip-shaped coarse fiber grain structure distributed along the rolling direction formed in the component after heat treatment seriously restricts the improvement of the mechanical properties of the high tube. and lead to severe anisotropy

[0003] Aiming at the research field of manufacturing process of 2A14 aluminum alloy high tube parts, the Chinese invention patent CN 104759850A proposes the traditional forming manufacturing process of high tube parts - "460 °C multi-directional forging billet opening + punching + 460 °C horse frame reaming, core Shaft pull length + 460°C continuous ring rolling", this process can better realize the forming of high tube parts through thermoplastic processing, but due to the dynamic softening of the high-temperature saddle reaming and high-temperature ring rolling forming process, the deformation resistance of the matrix is ​​small, and the deformation The shearing action does not sufficiently break up the coarse phase, and a large amount of coarse second phase remains in the matrix, which is large in size and difficult to dissolve in the subsequent heat treatment process, resulting in the formation of a high degree of stress concentration in the coarse phase when the high cylinder is loaded. Seriously reduce the plasticity of high-barrel parts; in addition, due to dynamic recovery, the energy stored in the form of dislocations in the components after high-temperature ring rolling is less, the recrystallization nucleation rate is reduced during heat treatment, and coarse grain structures are easily formed, resulting in high-barrel parts Difficult to increase strength

In the Chinese invention patent CN 104438419 A, the blanking process of the cross-heading drawing method is proposed to reduce the anisotropy of the high-barrel parts, and to prevent the end surface of the component from peeling and grooves by changing the ring rolling speed. The improved process proposed by the patent The deformation uniformity of the forging billet is improved, and the structure is homogenized, but the high-temperature ring rolling forming will lead to the formation of coarse fibrous structure, and the coarse second phase in the component is still difficult to break and dissolve during high-temperature plastic deformation and heat treatment, which seriously reduces the high temperature. Uniformity of Plasticity and Mechanical Properties of Cylinder Parts

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