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Forging method for improving anisotropy of 7XXX aluminum alloy forge piece

An anisotropic, aluminum alloy technology, applied in the direction of forging presses, forging presses, manufacturing tools, etc., can solve the problems of reducing the recrystallization volume fraction of warm forging, forgings cannot improve the three-dimensional anisotropy, etc., and achieve the improvement of comprehensive mechanical properties , Improve the effect of recrystallization volume fraction

Active Publication Date: 2020-11-24
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the process steps of warm forging followed by hot forging will seriously reduce the recrystallization volume fraction increased by warm forging, and the three-way anisotropy of the forging cannot be improved after heat treatment

Method used

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  • Forging method for improving anisotropy of 7XXX aluminum alloy forge piece
  • Forging method for improving anisotropy of 7XXX aluminum alloy forge piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The forging blank is φ540mm×300mm 7A85 aluminum alloy. The specific forging steps are as follows:

[0027] 1) Forging blank homogenization treatment: heat the forging blank to 400°C, keep it for 8h, continue to heat to 465°C, keep it for 4h, continue to heat to 470°C, keep it for 36h, and return to room temperature with the furnace cooling to below 270°C and air cooling;

[0028] 2) High temperature forging: high temperature forging initial forging temperature 430℃, final forging temperature 395℃, forging ratio 7.2;

[0029] 3) Medium temperature forging: Medium temperature forging has an initial forging temperature of 320°C, a final forging temperature of 298°C, and a forging ratio of 1.7;

[0030] 4) Low temperature forging: low temperature forging has an initial forging temperature of 265°C, a final forging temperature of 246°C, and a forging ratio of 1.3. The final size of the forging: 500mm×450mm×220mm.

Embodiment 2

[0032] The forging blank is φ160×350mm 7050 aluminum alloy. The specific forging steps are as follows:

[0033] 1) Forging blank homogenization treatment: heat the forging blank to 405°C, keep it for 12h, continue to heat to 465°C, keep it for 10h, continue to heat to 468°C, keep it for 48h, and cool to 250°C with the furnace and return to room temperature with air cooling;

[0034] 2) High temperature forging: high temperature forging initial forging temperature 440℃, final forging temperature 426℃, forging ratio 8.2;

[0035] 3) Medium temperature forging: Medium temperature forging has an initial forging temperature of 360°C, a final forging temperature of 345°C, and a forging ratio of 1.6;

[0036] 4) Low temperature forging: Low temperature forging has an initial forging temperature of 240°C, a final forging temperature of 231°C, and a forging ratio of 1.3. The final size of the forging: 250mm×220mm×60mm.

Embodiment 3

[0038] The forging blank is φ160×180mm LC9 aluminum alloy. The specific forging steps are as follows:

[0039] 1) Forging blank homogenization treatment: heat the forging blank to 405°C, keep it for 12h, continue heating to 465°C, keep it for 6h, continue heating to 472°C, keep it for 40h, then cool to 260°C with the furnace and return to room temperature with air cooling;

[0040] 2) High temperature forging: high temperature forging initial forging temperature 420℃, final forging temperature 398℃, forging ratio 8.2;

[0041] 3) Medium temperature forging: Medium temperature forging has an initial forging temperature of 380°C, a final forging temperature of 365°C, and a forging ratio of 2;

[0042] 4) Low temperature forging: low temperature forging has an initial forging temperature of 280°C, a final forging temperature of 261°C, and a forging ratio of 1.5. The final size of the forging: 220mm×200mm×100mm.

[0043] The properties of the three 7XXX aluminum alloy forgings prepared by ...

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Abstract

The invention belongs to the field of high-strength aluminum alloys, and particularly relates to a forging method for improving anisotropy of a 7XXX aluminum alloy forge piece. The forging method comprises forging forming steps as follows: homogenizing treatment of a forging blank, high-temperature forging, medium-temperature forging and low-temperature forging. According to the forging method foreffectively improving the anisotropy of the 7XXX aluminum alloy forge piece, recrystallization volume fraction of the 7XXX aluminum alloy forge piece is improved, strength difference and toughness difference of the forge piece in the longitudinal direction, the transverse direction and the height direction are reduced, comprehensive mechanical properties of the forge piece are improved, and the forging method is suitable for manufacturing the aluminum alloy forge pieces with thickness specification of 50 mm or larger.

Description

Technical field [0001] The invention belongs to the field of medium and high strength aluminum alloys, and relates to a forging method for improving the anisotropy of 7XXX aluminum alloy forgings. Background technique [0002] 7XXX aluminum alloy is widely used in aviation, aerospace, electronic radar and other fields due to its high strength, low density and excellent processing performance. In recent years, as the requirements for the integration of weapons and equipment have gradually increased, large-size 7XXX aluminum alloy forgings have become more and more widely used in equipment. At present, high-temperature forging methods are used in forging processes, and the forgings prepared by this method are anisotropic. serious problem. Therefore, the comprehensive performance requirements for aluminum alloy forgings are getting higher and higher, especially to reduce the serious anisotropy of large-size 7XXX aluminum alloy forgings. [0003] Patent 201210205032.6 discloses a 700...

Claims

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Application Information

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IPC IPC(8): B21J1/06B21J9/02B21K29/00C22C21/10C22F1/053
CPCB21J1/06B21J9/022B21J9/02B21K29/00C22F1/053C22C21/10
Inventor 高文林虞朝智孙进宝刘惠陈军洲陆政
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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