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Annealing method of 2219 aluminum alloy ingot and 2219 aluminum alloy deformed parts

An aluminum alloy casting ingot and aluminum alloy technology, which is applied in the field of 2219 aluminum alloy deformed parts, can solve the problems of large internal stress, difficulty in breaking, and high content of Cu elements in the ingot, so as to promote the diffusion of alloy elements, improve the deformation processing performance, reduce the Effect of small crack tendency

Active Publication Date: 2021-12-28
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the following problems usually exist in 2219 aluminum alloy ingots: (1) During the semi-continuous casting process, the secondary water cooling intensity is relatively large, and the heat in the center is too late to dissipate, resulting in a large gap between the edge and the center of the ingot. (2) The content of Cu element in 2219 aluminum alloy is very high, coupled with the non-equilibrium solidification, the microscopic segregation of Cu element is very serious, and a large amount of Al 2 Cu gathers at the grain boundary to form a network eutectic compound that is difficult to break; (3) impurity elements such as Fe and Si inevitably exist in the ingot, forming some coarse and sharp second phases, such as Al 5 FeSi, Al 8 FeMg 3 Si 6 、Al 8 FeMg 3 Si 5 etc. During the deformation process, these phases easily form stress concentration
These problems weaken the processing performance of 2219 aluminum alloy, and even lead to defects such as cracks in severe cases, and some problems still exist even after deformation processing, which seriously restricts the final service performance of 2219 aluminum alloy deformed parts

Method used

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  • Annealing method of 2219 aluminum alloy ingot and 2219 aluminum alloy deformed parts
  • Annealing method of 2219 aluminum alloy ingot and 2219 aluminum alloy deformed parts
  • Annealing method of 2219 aluminum alloy ingot and 2219 aluminum alloy deformed parts

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Experimental program
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Effect test

Embodiment 1

[0054] This embodiment provides a multi-stage homogenization annealing method for a 2219 aluminum alloy ingot with a diameter of 508 mm:

[0055] (1) The first annealing: heat the 2219 aluminum alloy ingot to 200°C at the first heating rate of 50°C / h in a heat treatment furnace, and keep it warm for 4.5h;

[0056] (2) Second annealing: heat the cast ingot after the first annealing treatment to 460°C at the second heating rate of 100°C / h, and keep it warm for 9.5h;

[0057] (3) The third annealing: heat the ingot after the second annealing treatment to 525°C at the third heating rate of 100°C / h, and keep it warm for 24h;

[0058] (4) Cooling: Air-cool the ingot after the third annealing treatment to room temperature.

Embodiment 2

[0067] This embodiment provides a multi-stage homogenization annealing method for a 2219 aluminum alloy ingot with a diameter of 730mm:

[0068] (1) The first annealing: heat the 2219 aluminum alloy ingot to 220°C at the first heating rate of 40°C / h in a heat treatment furnace, and keep it warm for 5.5h;

[0069] (2) Second annealing: heat the cast ingot after the first annealing treatment to 475°C at the second heating rate of 110°C / h, and keep it warm for 11h;

[0070] (3) The third annealing: heat the ingot after the second annealing treatment to 530°C at the third heating rate of 115°C / h, and keep it warm for 27.5h;

[0071] (4) Cooling: Air-cool the ingot after the third annealing treatment to room temperature.

Embodiment 3

[0080] This embodiment provides a multi-stage homogenization annealing method for a 2219 aluminum alloy ingot with a diameter of 420 mm:

[0081](1) The first annealing: heat the 2219 aluminum alloy ingot to 185°C at the first heating rate of 60°C / h in a heat treatment furnace, and keep it for 4h;

[0082] (2) Second annealing: heat the cast ingot after the first annealing treatment to 455°C at the second heating rate of 90°C / h, and keep it warm for 8h;

[0083] (3) The third annealing: heat the ingot after the second annealing treatment to 520°C at the third heating rate of 95°C / h, and keep it warm for 18h;

[0084] (4) Cooling: Air-cool the ingot after the third annealing treatment to room temperature.

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Abstract

The invention discloses an annealing method for a 2219 aluminum alloy ingot and a deformed 2219 aluminum alloy, belonging to the technical field of material heat treatment. The annealing method of the 2219 aluminum alloy ingot comprises the following steps: performing at least the following annealing operations on the 2219 aluminum alloy ingot: keeping the temperature at 180-240° C. for 4-6 hours, and then keeping the temperature at 450-480° C. for 8-8 hours. 12h, and then keep warm for 18-30h under the condition of 515-535°C. The multi-level homogeneous heat treatment of the 2219 aluminum alloy ingot by the above method can reduce the internal stress of the ingot, reduce the microscopic segregation of alloy elements, and reduce the reticular eutectic compound in the structure, and the spheroidized coarse and sharp second phase morphology , which in turn can improve the deformation processing performance of 2219 aluminum alloy ingot and the service performance of its deformed parts.

Description

technical field [0001] The invention relates to the technical field of heat treatment of materials, in particular to an annealing method for a 2219 aluminum alloy ingot and a 2219 aluminum alloy deformed part. Background technique [0002] 2219 aluminum alloy belongs to Al-Cu alloy, which has high strength and toughness, can maintain stable performance for a long time in the range of low to high temperature, and also has excellent processing performance, so it has a wide range of applications in the aerospace field. 2219 aluminum alloy is widely used in the application of rocket storage tanks. In these fields, 2219 aluminum alloy deformation parts are usually used, that is, 2219 aluminum alloy ingots can be put into use after deformation processing. As the basis for deformation processing, the quality of the ingot plays a vital role in the performance of the final deformation. [0003] However, the following problems usually exist in 2219 aluminum alloy ingots: (1) During ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/057
CPCC22F1/057
Inventor 邱阳刘明阳李新涛周楠郑开宏
Owner GUANGDONG INST OF NEW MATERIALS
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