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Method for multilevel creep age forming of Al-Zn-Mg-Cu series aluminium alloy plate

A creep aging forming, aluminum alloy sheet technology, applied in the field of non-ferrous metal material processing engineering, can solve the problems of high residual stress, difficult forming, etc., to improve mechanical properties and corrosion resistance, reduce production cycles, and save costs. Effect

Active Publication Date: 2013-03-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the subsequent processing process, there are problems such as high processing residual stress and difficult forming.

Method used

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  • Method for multilevel creep age forming of Al-Zn-Mg-Cu series aluminium alloy plate
  • Method for multilevel creep age forming of Al-Zn-Mg-Cu series aluminium alloy plate
  • Method for multilevel creep age forming of Al-Zn-Mg-Cu series aluminium alloy plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A 2mm thick plate is solidified in an air furnace at 475°C for 60 minutes and then water quenched. The creep pre-aging temperature is 120°C, the creep time is 24h, the regression temperature is 150°C, the regression time is 180min, and the re-aging is 120°C / 24h. The creep stress is 100MPa. The forming pre-bending radius is 1500mm.

Embodiment 2

[0030] B 10mm thick plate adopts 475°C air furnace for solid solution for 60 minutes and then water quenching. After quenching, the plate is pre-stretched by 2%. The creep pre-aging temperature is 120°C, the creep time is 24h, the return temperature is 150°C, and the return time 240min, then aging at 120℃ / 24h. The creep stress is 150MPa. The forming pre-bending radius is 1000mm.

Embodiment 3

[0032] The C20mm thick plate is quenched by water in an air furnace at 475°C for 60 minutes. After quenching, the plate is subjected to 4% pre-compression treatment. The creep pre-aging temperature is 120°C, the creep time is 24h, the regression temperature is 150°C, and the regression time is 180min. Re-aging at 120°C / 24h. The creep stress is 120MPa. The forming pre-bending radius is 1300mm.

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Abstract

The invention relates to a method for multilevel creep age forming of an Al-Zn-Mg-Cu series aluminium alloy plate. The method is characterized in that a reasonable solid solution-quenching-pretreating-multilevel creep aging system is adopted, is suitable for plates with the thickness of 2 millimeters-30millimeters and comprises the following steps that solid solution is carried out at 470-485 DEG C for 30 minutes-120 minutes, quenching is then carried out, the quenched plate is subjected to 0-10% predeformation treatment and creep aging at 120 DEG C and is thermally insulated for 24 hours, the creep return temperature is between 150 and 170 DEG C, return thermal insulation is carried out for 20-240 minutes, and another creep aging is thermally insulated at 120 DEG C for 24 hours, wherein the creep stress is between 100 and 150 mega pascals, and the forming bending radius is between 800 millimeters and 5000 millimeters. The method is utilized to treat Al-Zn-Mg-Cu series aluminium alloy, so that the alloy creep aging strengthening phase can be effectively regulated, the mechanical property of the alloy plate and the alloy creep formability are improved, the residual stress of the alloy plate is reduced, and the alloy exfoliation corrosion resistance is improved.

Description

technical field [0001] The invention relates to a multi-stage creep aging forming method for Al-Zn-Mg-Cu series aluminum alloy plates, which belongs to the technical field of non-ferrous metal material processing engineering. Background technique [0002] Al-Zn-Mg-Cu series alloys can strengthen aluminum alloys through aging, and have many advantages such as low density, high strength, and strong resistance to fatigue crack growth. They are widely used as materials for aerospace wall panels and skin components. In order to meet the requirements of forming Al-Zn-Mg-Cu aluminum alloy integral wall panels, creep aging forming technology has been proposed in recent years. The creep aging forming method is suitable for the forming of integral ribbed and variable-thickness complex shape and structure integral panel members of age-hardenable alloys. It has the advantages of low forming stress, less residual stress, high dimensional accuracy, and short manufacturing cycle. Studies ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04
Inventor 邓运来张新明杨金龙叶凌英王宇尹喜生胡珊珊刘胜胆
Owner CENT SOUTH UNIV
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