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Heat treatment method for reducing quenching residual stress of wrought aluminum alloy and improving performance of the aluminum alloy

A technology of deformed aluminum alloy and heat treatment method, which is applied in the field of heat treatment, can solve the problems of reducing and reducing residual stress, and achieve the effects of uniform distribution of structure, reduction of residual stress, and reduction of residual stress

Inactive Publication Date: 2013-03-13
邓运来
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the general "rolling-solution-quenching-pre-stretching (or pre-compression)-aging" process, the warpage of the plate after quenching is the superposition of the warpage caused by internal stress after quenching and the warpage before quenching. Too much warpage will reduce the effect of pre-tensioning or pre-compression to relieve residual stress

Method used

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  • Heat treatment method for reducing quenching residual stress of wrought aluminum alloy and improving performance of the aluminum alloy
  • Heat treatment method for reducing quenching residual stress of wrought aluminum alloy and improving performance of the aluminum alloy
  • Heat treatment method for reducing quenching residual stress of wrought aluminum alloy and improving performance of the aluminum alloy

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Effect test

Embodiment 1

[0030] After the aluminum alloy ingot hot rolling mill is rolled, the plate is subjected to the first solid solution treatment in the air heating furnace with a system of 525°C / 4h. After the solution treatment is completed, it is quenched in water within 20 seconds. After it is below °C, take it out of the pool and dry it, and use a roller plate straightening machine to perform 2% reduction leveling treatment. The leveled plate is subjected to a second solid solution treatment in a resistance furnace using a system of 525°C / 2h, and then subjected to a second quenching treatment and post-aging.

Embodiment 2

[0032] After the B aluminum alloy ingot hot rolling mill is rolled, the plate is subjected to the first solid solution treatment in the salt bath furnace using a system of 525°C / 2h. After the solution treatment is completed, it is quenched in water within 20 seconds. After it is below °C, take it out of the pool and dry it, and use a roller plate straightening machine to perform 1% reduction leveling treatment. After the second solid solution treatment of the leveled plate in a salt bath furnace at 525°C / 2h, pre-stretch 2% of the total length, and then perform aging after the second quenching treatment.

Embodiment 3

[0034] C After the aluminum alloy ingot is rolled by the hot rolling mill, the plate is subjected to the first solid solution treatment in the roller hearth furnace with a system of 525°C / 4h. After the solid solution treatment, it is quenched in the roller hearth furnace. After it is below °C, take it out of the pool and dry it, and use a roller plate straightening machine to perform 2% reduction leveling treatment. The leveled plate is subjected to the second solution treatment at 525°C / 2h in the roller hearth furnace, pre-compressed by 4%, and then aged after the second quenching treatment.

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Abstract

The invention discloses a heat treatment method for reducing quenching residual stress of wrought aluminum alloy and improving performance of the aluminum alloy. The key of the invention is by adopting a reasonable system of deformation-solution hardening-leveling-solution hardening, and the invention is applicable to the wrought aluminum alloy sheet. The method is as below: conducting solution treatment according to a conventional system; conducting water quenching; cleaning quenching medium on the plate surface after quenching treatment; applying 0.5-2% of deformation on a thickness direction of the plate to straighten the plate; placing the straightened plate into the heating furnace for second solution hardening, wherein the solution hardening uses the conventional system of water quenching after solution treatment; and after quenching, conducting 0-8% of pre-deformation on the plate, and ageing for further reducing residual stress from quenching. According to the invention, a reasonable double quenching process can be used to promote uniform tissue and texture on the thickness direction of the alloy, so as to effectively reduce the residual stress in the premise of maintaining the mechanical properties. Compared with a conventional solution and aging treatment method, the method provided by the invention reduces residual stress by at least 35%, and increases room temperature tensile strength by at least 5%. The process is simple, cost-saving, and easy for application to industrial production.

Description

technical field [0001] The invention relates to a heat treatment method for reducing the quenching residual stress of a deformed aluminum alloy and improving the properties of the alloy, and is suitable for the production of aluminum alloy plates that can be strengthened by heat treatment, and the technical fields of nonferrous metal material processing engineering. Background technique [0002] Heat-treatable and strengthened aluminum alloy (6×××, 2×××, 7×××) materials produced by deformation methods (rolling, extrusion, forging), have the characteristics of light weight and high strength, and are used in aerospace, transportation Lightweight material widely used in the field. The microstructural feature of wrought aluminum alloy materials is the formation of diffusely distributed nano / submicron second phases on the aluminum matrix. The grain size, orientation distribution of the aluminum matrix and the type, quantity, and shape of the second phase will all affect this type...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/047C22F1/057C22F1/053
Inventor 邓运来李志威杨金龙李美春万里李鑫
Owner 邓运来
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