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Heat treatment method capable of reducing stress of spray-formed 7000 series aluminum alloy products

A technology of aluminum alloy products and heat treatment methods, applied in the field of heat treatment to reduce the stress of spray-formed 7000 series aluminum alloy products, to achieve the effects of solving deformation and cracking and improving comprehensive performance

Active Publication Date: 2015-12-30
JIANGSU HAORAN SPRAY FORMING ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a heat treatment method that can efficiently reduce the residual stress of spray-formed 7000 series aluminum alloy products and improve the comprehensive performance of the product on the basis of maintaining relatively high strength, so as to reduce the residual stress of the product in the subsequent processing process. The risk of cracking in the middle, and reduce the processing deformation of the product to improve the dimensional accuracy

Method used

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  • Heat treatment method capable of reducing stress of spray-formed 7000 series aluminum alloy products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The 7055 aluminum alloy spray-formed ingot is extruded (extrusion ratio 14.8) into a Φ130mm bar after being wagoned, and the bar is processed into a product blank. The wall thickness of the blank is about 12mm. The blank is subjected to T6 heat treatment. The heat treatment steps are as follows: :

[0026] a) Secondary solid solution treatment, room temperature rises to 450°C for 2 hours, keeps at 450°C for 3 hours, rises to 477°C for 0.5 hours, keeps at 477°C for 3 hours, and quenches at 50°C.

[0027] b) Single-stage peak aging treatment, the room temperature was raised to 120°C for 1 hour, and kept at 120°C for 24 hours.

[0028] c) High temperature stress relief aging, heat preservation at 140°C for 10 hours.

[0029] In the above examples, compared with the product blank without high-temperature stress-relief aging, after high-temperature stress-relief aging, the tendency of cracking in the subsequent machining process is significantly reduced, the amount of defor...

Embodiment 2

[0033] Extrude the 7085 aluminum alloy spray-formed ingot into a plate with a specification of δ100mm×200mm, and the blanking length is 250mm. The plate is subjected to T76 heat treatment, and the steps are as follows:

[0034] a) Secondary solid solution treatment, room temperature rises to 450°C for 2 hours, keeps at 450°C for 3 hours, rises to 477°C for 0.5 hours, keeps at 477°C for 3 hours, and quenches at 50°C.

[0035] b) Two-stage artificial aging treatment, the room temperature was raised to 120°C for 1 hour, kept at 120°C for 8 hours, and then raised to 160°C for 12 hours for 1 hour.

[0036] After the heat treatment is completed, it is machined, the wall thickness of the product is about 15mm, and then a high temperature stress relief aging is carried out. The steps are:

[0037] c) High temperature stress relief aging, heat preservation at 140°C for 24 hours;

[0038] This is followed by a multi-pass finishing process, resulting in a final product with a wall thick...

Embodiment 3

[0041] The 7055 aluminum alloy spray-formed ingot is subjected to wagoning, reverse extrusion, forging, and machining, and is formed into a blank of a complex structure for aerospace with an outer diameter of 280mm, a wall thickness of 20mm, and a height of 750mm, with 7 rectangular holes, the largest of which is The largest rectangular hole is 180×150, the smallest rectangular hole is 90×65, and then T6 heat treatment and high temperature stress relief aging treatment are carried out. The heat treatment steps are as follows:

[0042] a) Secondary solid solution treatment, room temperature rises to 450°C for 2 hours, keeps at 450°C for 3 hours, rises to 477°C for 0.5 hours, keeps at 477°C for 3 hours, and quenches at 50°C.

[0043] b) Single-stage peak aging treatment, the room temperature was raised to 120°C for 1 hour, and kept at 120°C for 24 hours.

[0044] c) High temperature stress relief aging, heat preservation at 140°C for 24 hours.

[0045] After the heat treatment is...

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Abstract

The invention relates to 7000 series aluminum alloys, in particular to a heat treatment method capable of reducing stress of spray-formed 7000 series aluminum alloy products. The heat treatment method comprises a two-stage solid solution treatment step and an artificial ageing treatment step sequentially and is characterized in that after the artificial ageing treatment step and before rough machining or after the rough machining and before finish machining, high-temperature stress-relieving aging is performed, that is, heat preservation is performed at the temperature of 125-155 DEG C for 8-32 h. The heat treatment method can maintain the higher strength level of the spray-formed 7000 series aluminum alloy products, reduce residual stress efficiently and improve the comprehensive performance of the products, the problem of cracking of the products in follow-up machining process is solved, machining deformation of the products is reduced, the machining efficiency is improved, and the dimensional precision is improved.

Description

technical field [0001] The invention relates to a 7000-series aluminum alloy, in particular to a heat treatment method for reducing the stress of a spray-formed 7000-series aluminum alloy product. Background technique [0002] The 7000 series (Al-Zn-Mg-Cu) aluminum alloy with Zn, Mg, and Cu as the main alloying elements has the advantages of low density, high strength, and good plasticity, and is currently widely used in high-end aerospace and other high-end fields. High-toughness aluminum alloy; the 7000 series aluminum alloy produced by spray forming process has the advantages of fine grain, uniform and dense structure, and no macro segregation. [0003] The 7000 series aluminum alloy belongs to the heat-treatable aluminum alloy, and its strength can be greatly improved through various heat treatment systems. For example, the tensile strength of spray-formed 7055-T6 state can reach 720MPa, which is 227% higher than that of 220MPa in the O state, but at the same time , the...

Claims

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Application Information

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IPC IPC(8): C22F1/04
Inventor 张豪张捷马万太张桢
Owner JIANGSU HAORAN SPRAY FORMING ALLOY
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