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Method of reducing residual stress and quenching deformation non-uniformity of aluminum alloy after deformation

A technology of residual stress and quenching deformation, which is applied in the fields of reducing residual stress after deformation of aluminum alloys and non-uniformity of quenching deformation, can solve problems such as reducing and reducing residual stress, and achieve reduction of residual stress, increase of deformation heat treatment process, and serious warping Effect

Inactive Publication Date: 2013-02-06
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When pre-stretching or pre-compression is used to reduce the quenching residual stress of aluminum alloy materials, the difference in yield strength caused by the inhomogeneity of the core layer and the surface layer of the plate will reduce the effect of reducing the residual stress

Method used

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  • Method of reducing residual stress and quenching deformation non-uniformity of aluminum alloy after deformation
  • Method of reducing residual stress and quenching deformation non-uniformity of aluminum alloy after deformation
  • Method of reducing residual stress and quenching deformation non-uniformity of aluminum alloy after deformation

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Experimental program
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Effect test

Embodiment 1

[0028] After the aluminum alloy ingot is rolled in a hot rolling mill, the plate is annealed at 350°C / 2h in a resistance heating furnace. After the annealing treatment, it is leveled with a hot rolling mill. 0.5%. The total temperature deformation is 3%, solution treatment is carried out in the air furnace, put into water for quenching within 20 seconds after the solution treatment is completed, and take it out of the water pool after the temperature of the plate drops below 50°C and dry it in the air. deal with.

Embodiment 2

[0030] After the B aluminum alloy ingot is rolled by a hot rolling mill, the plate is annealed at 350°C / 4h in a resistance heating furnace. 0.5%. The total amount of thermal deformation and deformation is 4%. The plate is subjected to solution treatment in a salt bath furnace. After the solution treatment is completed, it is quenched in water within 20 seconds. After the temperature of the plate drops below 50°C, it is taken out of the pool and dried. , pre-stretched to 3% of the total length, and then aged.

Embodiment 3

[0032] After the C aluminum alloy ingot is rolled by a hot rolling mill, the plate is annealed at 350°C / 4h in a resistance heating furnace. 0.5%). The total temperature deformation is 5%. After the solid solution treatment, it is quenched in a roller hearth furnace. After the temperature of the plate drops below 50°C, it is taken out and dried, pre-compressed by 5% of the total thickness, and then quenched and aged.

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Abstract

The invention discloses a method of reducing residual stress and quenching deformation non-uniformity of an aluminum alloy after deformation. The key of the invention is as follows: a reasonable deformation, annealing, warm rolling, solution hardening and prescription system is adopted, and the method is suitable for a wrought aluminum alloy board. The method comprises the following steps of: rolling the aluminum alloy board, annealing at 300-350 DEG C, thermally insulating for 0.5-4 hours, carrying out warm rolling and leveling at rolling reduction of 3-5%, carrying out board solution after leveling and water-quenching, pre-deforming for 0-8% after quenching and ageing, and further eliminating quenching residual stress. By adopting the invention, the quenching residual stress of the aluminum alloy board is reduced through a reasonable warm-rolling and leveling process, quenching deformation non-uniformity of the alloy is improved, in comparison with the regular rolling, solution and ageing method, the residual stress is at least reduced by 30%, the room-temperature tensile strength is at least improved by 8%, and the process method has the advantages of simple operation, capability of saving the cost, and wide industrial application prospect.

Description

technical field [0001] The invention relates to a method for reducing the residual stress after deformation of an aluminum alloy and the non-uniformity of quenching deformation, and is suitable for the production of aluminum alloy plates that can be strengthened by heat treatment, and the technical fields of non-ferrous metal material processing engineering. Background technique [0002] Aluminum alloys (6×××, 2×××, 7×××) can be strengthened by heat treatment. Due to their advantages of high strength, high toughness, light weight and corrosion resistance, they are widely used in aerospace and transportation fields. Deformed aluminum alloy materials are often rolled and deformed to obtain components of the required size and shape. When the alloy is quenched after rolling, due to the difference in cooling rate between the surface and the core, the deformation is uneven under the action of thermal stress, and quenching residues are easy to occur. stress. The quenching residual...

Claims

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Application Information

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IPC IPC(8): C22F1/04
Inventor 邓运来杨金龙李美春章效宾万里李思宇王宇罗伟张新明
Owner CENT SOUTH UNIV
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