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Non-isothermal creep age forming method for Al-Zn-Mg-Cu series aluminum alloy plate

A technology of creep aging forming and aluminum alloy plates, which is applied in heat treatment equipment, furnaces, heat treatment furnaces, etc., and can solve problems such as difficult to accurately control cooling speed, limit heating and cooling speed, etc.

Pending Publication Date: 2022-04-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method strictly limits the heating and cooling rate during the aging process, and in actual production, due to equipment limitations, especially for large parts, it is often difficult to precisely control the cooling rate

Method used

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  • Non-isothermal creep age forming method for Al-Zn-Mg-Cu series aluminum alloy plate
  • Non-isothermal creep age forming method for Al-Zn-Mg-Cu series aluminum alloy plate
  • Non-isothermal creep age forming method for Al-Zn-Mg-Cu series aluminum alloy plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A 2mm thick plate adopts solution treatment, heats it at 470°C for 1h, heats it to 500°C for 1h, and then performs water quenching at room temperature within 5s. The plates were then clamped in a mold with a curvature of 1000 mm for non-isothermal creep aging. The heating rate of non-isothermal creep aging is 20℃ / h, and the maximum aging temperature is 160℃. After heating up to the highest aging temperature, stop heating immediately, and the plate and mold as a whole are cooled to 50°C with the furnace, then taken out and unloaded, and the alloy plate is air-cooled to room temperature.

Embodiment 2

[0029] B 2mm-thick plate adopts solid solution treatment, heats it at 470°C for 1h, heats it to 500°C for 1h, and then performs water quenching at room temperature within 5s. The plates were then clamped in a mold with a curvature of 1000 mm for non-isothermal creep aging. The non-isothermal creep aging heating rate is 20°C / h, and the maximum aging temperature is 180°C. After heating up to the highest aging temperature, stop heating immediately, and the plate and mold as a whole are cooled to 50°C with the furnace, then taken out and unloaded, and the alloy plate is air-cooled to room temperature.

Embodiment 3

[0031]C 2mm thick plate adopts solution treatment, heat at 470°C for 1h, heat to 500°C for 1h, and then water quench at room temperature within 5s. The plates were then clamped in a mold with a curvature of 1000 mm for non-isothermal creep aging. The non-isothermal creep aging heating rate is 20°C / h, and the maximum aging temperature is 200°C. After heating up to the highest aging temperature, stop heating immediately, and the plate and mold as a whole are cooled to 50°C with the furnace, then taken out and unloaded, and the alloy plate is air-cooled to room temperature.

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Abstract

The invention discloses a non-isothermal creep age forming method for an Al-Zn-Mg-Cu series aluminum alloy plate. The method comprises the following steps: carrying out enhanced solution treatment on the Al-Zn-Mg-Cu series aluminum alloy plate; the alloy plate treated in the first step is subjected to mechanical loading, and the alloy surface is attached to the mold; the alloy plate treated in the second step is subjected to non-isothermal creep aging treatment, the highest aging temperature of non-isothermal creep aging forming is 160-200 DEG C, the heating rate is 10-40 DEG C / h, heating is stopped after the alloy plate is heated to the highest aging temperature, and furnace cooling is conducted; and the mold and the plate are integrally taken out, and the plate is unloaded from the mold. Intragranular and grain boundary precipitated phase parts are dissolved near the highest aging temperature, and the continuity of the grain boundary precipitated phase is broken. And in the subsequent furnace cooling process, the precipitated phase is separated out again, the grain boundary precipitated phase is still discontinuously distributed, the mechanical strength of the alloy is improved, and the corrosion resistance is improved.

Description

technical field [0001] The invention relates to a non-isothermal creep aging forming method for an Al-Zn-Mg-Cu series aluminum alloy plate, belonging to the technical field of non-ferrous metal material processing engineering. Background technique [0002] Al-Zn-Mg-Cu alloys are widely used in the aerospace industry due to their high strength. Residual stresses are usually unavoidable in parts produced by the traditional forming-then-aging process. Therefore, the creep aging forming method integrating forming and forming has been widely concerned. The plate is fixed to the mold by high pressure or mechanical clamping, the surface of the plate is closely attached to the mold, and then the given artificial aging temperature is loaded. Under the action of the thermal-force field, part of the elastic deformation is transformed into plastic deformation, and at the same time, the mechanical strength is improved through age hardening. The creep age forming method is an ideal for...

Claims

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Application Information

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IPC IPC(8): C22F1/053C21D9/00
Inventor 李小强王令姣潘存良朱德智屈盛官黄遐
Owner SOUTH CHINA UNIV OF TECH
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