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Method for reducing quenching residual stress of 7000 series aluminum alloy thick sheet and aluminum alloy sheet

A residual stress and aluminum alloy technology, which is applied to a method of reducing the residual stress of 7000 series aluminum alloy thick plate quenching and the field of aluminum alloy sheet, can solve the problem of weakening, excavation and optimization without considering the mechanical properties of aluminum alloy thick plate at the same time, etc. problems, to achieve the effect of reducing residual stress, improving mechanical properties, and simple process

Inactive Publication Date: 2021-06-08
YANTAI NANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The traditional methods of reducing residual stress, including the selection of quenching medium, pre-stretching treatment, etc., have reduced part of the residual stress to varying degrees, but at the same time have a certain weakening effect on the mechanical properties of 7000 series aluminum alloy thick plates
The proposed method for quenching residual stress reduction does not simultaneously consider the mining and optimization of the mechanical properties of aluminum alloy thick plates

Method used

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  • Method for reducing quenching residual stress of 7000 series aluminum alloy thick sheet and aluminum alloy sheet
  • Method for reducing quenching residual stress of 7000 series aluminum alloy thick sheet and aluminum alloy sheet
  • Method for reducing quenching residual stress of 7000 series aluminum alloy thick sheet and aluminum alloy sheet

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Embodiment 1

[0030] A method for reducing quenching residual stress of 7000 series aluminum alloy thick plate, comprising the following steps:

[0031] (1) After smelting and rolling the 7050 aluminum alloy, it is subjected to solution treatment at 470°C for 30 minutes;

[0032] (2) Intermittently cooling the 7050 aluminum alloy plate obtained in step (1), the first cooling rate is 25°C / s, cooled to 120°C, and then cooled to room temperature at a cooling rate of 2°C / min;

[0033] (3) Perform 0.2% pre-strain treatment and pre-aging treatment at 120°C for 10 minutes;

[0034] (4) Carry out 0.2% secondary pre-strain treatment, and artificial aging treatment at 160°C for 8h.

[0035] figure 2 is the final TEM fine structure map of 7050 aluminum alloy, by figure 2 It can be seen that the structure treated by the present invention has a high density of precipitated phases in the crystal, and the yield strength and tensile strength reach 625MPa and 690MPa respectively, as shown in Table 1. ...

Embodiment 2

[0037] A method for reducing quenching residual stress of 7000 series aluminum alloy thick plate, comprising the following steps:

[0038] (1) After smelting and rolling the 7055 aluminum alloy, it is subjected to solution treatment at 460°C for 45 minutes;

[0039] (2) Intermittently cooling the 7055 aluminum alloy thick plate obtained in step (1), the first cooling rate is 30°C / s, cooled to 100°C, and then cooled to room temperature at a cooling rate of 1°C / min;

[0040] (3) Perform 0.3% pre-strain treatment and pre-aging treatment at 100°C for 40 minutes;

[0041] (4) Carry out 0.2% secondary pre-strain treatment, and artificial aging treatment at 180°C for 6h.

[0042] image 3 is the final TEM fine structure map of 7050 aluminum alloy, by image 3 It can be seen that the structure treated by the present invention has a high density of precipitated phases in the crystal, and the yield strength and tensile strength reach 675MPa and 715MPa respectively, as shown in Table ...

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Abstract

The invention relates to the technical field of aluminum alloy heat treatment, in particular to a method for reducing quenching residual stress of a 7000 series aluminum alloy thick sheet and the aluminum alloy sheet. The method is characterized in that firstly, solution treatment is conducted on the 7000 series aluminum alloy thick sheet, wherein intermittent cooling is adopted in a cooling process of solution treatment so as to inhibit precipitation of a second phase and reduce an internal and external stress difference; then pre-strain treatment is conducted to reduce the residual stress; and finally pre-aging treatment is conducted to regulate and control states of solid-solution atoms. Compared with the prior art, the method has the advantages that the process is simple, equipment does not need to be transformed, the mechanical property is obviously improved while the residual stress is reduced, and the method is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy heat treatment, in particular to a method for reducing the quenching residual stress of a 7000 series aluminum alloy thick plate and an aluminum alloy plate. Background technique [0002] Aluminum alloy thick plates with high strength, high toughness and low residual stress are indispensable key materials in the field of aerospace, and occupy a very important position in the national economy and national defense industry. The production and consumption of aluminum alloy thick plates for aviation not only reflect the aluminum processing status of a country, but more importantly, reflect the scientific and technological level and comprehensive economic strength of a country. [0003] The 7000 series Al-Zn-Mg-Cu alloy has the advantages of low density, high strength, toughness and good processing performance, and has become the main material for large aircraft body structural parts. The 7000 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/053
CPCC22F1/002C22F1/053
Inventor 李大林朱鹏程孙杰王萍吕正风王春华杨丽娟
Owner YANTAI NANSHAN UNIV