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Heat treatment method suitable for high-strength aluminum alloy thick plates

A heat treatment method and technology for aluminum alloy, applied in the field of aluminum alloy heat treatment process, can solve the problems of poor toughness, difference in structure, difference in performance, etc., and achieve the effect of improving fracture toughness, increasing supersaturation, and expanding the scope of application

Inactive Publication Date: 2011-03-16
苏州有色金属研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a heat treatment method suitable for high-strength aluminum alloy thick plates to solve the problems that there are certain structural differences and performance differences at different thickness parts of high-strength aluminum alloy thick plates, high strength and poor toughness. Adjust the solution heat treatment process and aging process of ultra-thick gauge plates. On the basis of controlling the uniformity of thick plates and maintaining the strength of ultra-high-strength alloys, the fracture toughness of the alloys is further improved, and the application range of aluminum alloys is expanded.

Method used

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  • Heat treatment method suitable for high-strength aluminum alloy thick plates
  • Heat treatment method suitable for high-strength aluminum alloy thick plates
  • Heat treatment method suitable for high-strength aluminum alloy thick plates

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Taking the 7150 aluminum alloy plate with 75% hot rolling deformation of 80mm as an example, its chemical composition (mass fraction%) is Zn 6.50%, Mg 2.35%, Cu 2.15%, Zr 0.10%, Fe 0.05%, Si 0.01% , Al balance.

[0038] Two-stage forced solution treatment: 7150 alloy is subjected to two-stage forced solution treatment, first-stage solution treatment at 425°C for 4 hours, and then second-stage enhanced solution treatment at 460°C for 6 hours.

[0039] After the two-stage forced solid solution, the quenching treatment is cooled to room temperature, the quenching medium is water at room temperature, and the quenching transfer time is less than 10s.

[0040] Pre-stretching is carried out within 4 hours after the two-stage forced solution quenching, and the pre-stretching deformation is 2%, so as to eliminate the quenching stress and increase the dislocation density in the alloy.

[0041] The pre-stretched alloy was aged at 145°C for 150min, and aged at 80°C for 48h after r...

Embodiment 2

[0043] Taking the 7150 aluminum alloy plate with 75% hot rolling deformation of 80mm as an example, its chemical composition (mass fraction%) is Zn 6.50%, Mg 2.35%, Cu 2.15%, Zr 0.10%, Fe 0.05%, Si 0.01% , Al balance.

[0044] Two-stage forced solution treatment: 7150 alloy is subjected to two-stage forced solution treatment, first-stage solution treatment at 435°C for 3 hours, and then second-stage enhanced solution treatment at 475°C for 5 hours.

[0045] After the two-stage forced solid solution, the quenching treatment is cooled to room temperature, the quenching medium is water at room temperature, and the quenching transfer time is less than 10s.

[0046] Pre-stretching is carried out within 3 hours after the two-stage forced solution quenching, and the pre-stretching deformation is 2.5%, so as to eliminate the quenching stress and increase the dislocation density in the alloy.

[0047] The pre-stretched alloy was aged at 170°C for 90min, and aged at 100°C for 32h after r...

Embodiment 3

[0049] Taking the 7150 aluminum alloy plate with 75% hot rolling deformation of 80mm as an example, its chemical composition (mass fraction%) is Zn 6.50%, Mg 2.35%, Cu 2.15%, Zr 0.10%, Fe 0.05%, Si 0.01% , Al balance.

[0050] Two-stage forced solution treatment: 7150 alloy is subjected to two-stage forced solution treatment, first-stage solution treatment at 450°C for 2 hours, and then second-stage enhanced solution treatment at 485°C for 4 hours.

[0051] After the two-stage forced solid solution, the quenching treatment is cooled to room temperature, the quenching medium is water at room temperature, and the quenching transfer time is less than 10s.

[0052] Pre-stretching is carried out within 1 hour after the two-stage forced solution quenching, and the pre-stretching deformation is 3.0%, so as to eliminate the quenching stress and increase the dislocation density in the alloy.

[0053] The pre-stretched alloy was aged at 185°C for 45min, and aged at 120°C for 24h after ...

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Abstract

The invention relates to a heat treatment method suitable for high-strength aluminum alloy thick plates, which comprises the following steps of: performing twin-stage enforced solution treatment on 7xxx series high-strength aluminum alloy subjected to hot working, namely performing first-stage solution treatment at the temperature of between 400 and 450 DEG C for 4 to 6 hours, and performing second-stage enforced solution treatment at the temperature of between 450 and 500 DEG C for 4 to 6 hours; performing quenching treatment and cooling to room temperature, wherein a quenching medium is room temperature water; prestretching in 1 to 4 hours after quenching treatment, wherein the prestretching deformation is 1 to 3 percent; performing high-temperature short-time ageing treatment, wherein the ageing temperature is 120 to 190 DEG C and the ageing time is 30 to 150 minutes; performing quenching treatment and cooling to room temperature, wherein the quenching medium is room temperature water; and performing low-temperature long-time ageing treatment, wherein the ageing temperature is 60 to 120 DEG C and the ageing time is 18 to 48 hours. On the basis of controlling the structural homogeneity of the thick plates and keeping the strength of the super-high strength alloy, the fracture toughness of the alloy is further improved and the application range of the aluminum alloy is widened.

Description

technical field [0001] The invention relates to a heat treatment method suitable for high-strength aluminum alloy thick plates, and belongs to the technical field of aluminum alloy heat treatment technology. Background technique [0002] When the thickness of the 7××× high-strength aluminum alloy plate is greater than 60mm, the total deformation and pass deformation during rolling forming are lower than that of the plate, and the high-strength aluminum alloy heat treatment process commonly used at present is adopted. There are certain differences in structure and performance, which limit the application range of this type of alloy. In order to give full play to the advantages of high-strength aluminum alloys, it is necessary to further improve the fracture toughness of the alloy on the basis of controlling the uniformity of the structure of the thick plate and maintaining the strength of the ultra-high-strength alloy. [0003] The 7××× series high-strength aluminum alloy is...

Claims

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Application Information

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IPC IPC(8): C22F1/04
Inventor 张文静郭富安邓桢桢
Owner 苏州有色金属研究院有限公司
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