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A kind of ultra-high-strength, corrosion-resistant and low-stress aluminum alloy material and its preparation method

An aluminum alloy material and ultra-high-strength technology, which is applied in the field of ultra-high-strength, corrosion-resistant, low-stress aluminum alloy materials and their preparation, can solve the problems of mechanical properties and corrosion resistance degradation, and achieve improved mechanical properties and corrosion resistance , The effect of residual stress reduction is remarkable, and the effect of reducing the residual stress of quenching

Active Publication Date: 2019-12-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The existing cryogenic treatment technology can eliminate about 75% of residual stress, and aging treatment is required after cryogenic treatment, which will cause a decline in mechanical properties and corrosion resistance

Method used

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  • A kind of ultra-high-strength, corrosion-resistant and low-stress aluminum alloy material and its preparation method
  • A kind of ultra-high-strength, corrosion-resistant and low-stress aluminum alloy material and its preparation method
  • A kind of ultra-high-strength, corrosion-resistant and low-stress aluminum alloy material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for preparing an ultra-high-strength, corrosion-resistant and low-stress aluminum alloy material, comprising the steps of:

[0043] (1) Pre-stretch the extruded sheet material obtained in step (h) until the material yields, and then perform three-step stretching, wherein the stretching rate of the first step is 0.5%, the stretching rate of the second step is 1.0%, and the third step The step stretch rate was 2.0%; the stretch rate was 0.2mm / min.

[0044] (2) Cool the extruded sheet obtained in step (1) to -197°C, keep it warm for 2h, then place it at 170°C for 0.2h, and the heating rate is 80°C / h; then cool the extruded sheet to -197°C ℃, keep warm for 2h, take it out and heat it up to 10℃ at a heating rate of 40℃ / h, and then roll it. The rolling reduction rate is 10%; after rolling, place the extruded plate at 60℃ 200h; after the extruded sheet is cooled to 10°C, it is rolled again, and the rolling reduction rate is 10%; after rolling, the extruded sheet is p...

Embodiment 2

[0046] A method for preparing an ultra-high-strength, corrosion-resistant and low-stress aluminum alloy material, comprising the steps of:

[0047] (1) Same as step (1) of Example 1.

[0048] (2) Cool the extruded sheet obtained in step (1) to -197°C, keep it warm for 2h, then place it at 170°C for 0.2h, and the heating rate is 80°C / h; then cool the extruded sheet to -197°C ℃, keep warm for 2h, take it out and heat it up to 10℃ at a heating rate of 40℃ / h, and then roll it. The rolling reduction rate is 10%; after rolling, place the extruded plate at 60℃ 200h; after the extruded sheet is cooled to 10°C, it is rolled again, and the rolling reduction rate is 20%; after rolling, the extruded sheet is placed at 110°C for 2h, and the heating rate is 15% °C / h; then cool the extruded sheet to -197°C and keep it warm for 2h; then place it at 165°C for 6h with a heating rate of 60°C / h; then cool the extruded sheet to 15°C with a cooling rate of 10°C / h; the ultra-high-strength, corrosi...

Embodiment 3

[0050] A method for preparing an ultra-high-strength, corrosion-resistant and low-stress aluminum alloy material, comprising the steps of:

[0051] (1) Same as step (1) of Example 1.

[0052] (2) Cool the extruded sheet obtained in step (1) to -197°C, keep it warm for 2h, then place it at 170°C for 0.2h, and the heating rate is 80°C / h; then cool the extruded sheet to -197°C ℃, keep warm for 2h, take it out and heat it up to 10℃ at a heating rate of 40℃ / h, and then roll it. The rolling reduction rate is 10%; after rolling, place the extruded plate at 60℃ 200h; after the extruded sheet is cooled to 10°C, it is rolled again, and the reduction rate of rolling is 30%; after rolling, the extruded sheet is placed at 110°C for 2h, and the heating rate is 15% °C / h; then cool the extruded sheet to -197°C and keep it warm for 2h; then place it at 165°C for 6h with a heating rate of 60°C / h; then cool the extruded sheet to 15°C with a cooling rate of 10°C / h; the ultra-high-strength, corr...

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Abstract

The invention relates to a superhigh-strength, corrosion-resistant and low-stress aluminum alloy material and a preparing method thereof. The aluminum alloy material is a 7xxx series aluminum alloy material. The tensile strength is 652-735MPa, the yield strength is 572-706Mpa, the inter-crystalline corrosion depth is 127-215mum, and the residual stress is 3.97-21.84MPa. The preparing method comprises a multi-step low-speed drawing technology for extruded plates and a multiple subzero treatment technology for the extruded plates. The preparing method greatly reduces quenching residual stress. The multiple subzero treatment technology is combined with an interrupted ageing technology and a deformation heat treatment technology for the super-strength aluminum alloy, so that aging treatment does not need to be carried out later, and the mechanical properties and the corrosion resistance of the extruded plates are greatly improved. Compared with common products, the aluminum alloy materialhas the advantages that the strength of the product is improved by 17.9%, the inter-crystalline corrosion depth is reduced by about 50%, and the residual stress eliminating effect is as high as 98%.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy preparation, and in particular relates to an ultra-high-strength, corrosion-resistant, low-stress aluminum alloy material and a preparation method thereof. Background technique [0002] Ultra-high-strength aluminum alloys have been widely used in aerospace, machinery and automobile manufacturing industries due to their comprehensive properties such as low density, high strength, good toughness and corrosion resistance, excellent machinability and weldability. While ultra-high-strength aluminum alloys obtain high strength and toughness through solid solution and aging, during the quenching process, the high quenching and cooling strength causes a huge temperature difference between the surface and the inside of the material, and after cooling, a huge residual stress is formed inside the component. The release and relaxation of residual stress will occur during processing, storage and long-te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/053
CPCC22F1/053
Inventor 李承波周旺李建湘邓运来张新明
Owner CENT SOUTH UNIV