Wrought aluminum alloy and heat treatment method thereof

A heat treatment method and a technology for deforming aluminum alloys, which are applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of rapid maintenance of aviation aircraft, insufficient mechanical properties, fracture toughness, and uneven three-dimensional mechanical properties. Avoid coarse precipitation of grain boundaries, improve intergranular corrosion ability, and improve the effect of bulk performance

Active Publication Date: 2021-10-22
CRRC QINGDAO SIFANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems of insufficient mechanical properties and fracture toughness of existing deformed aluminum alloys, uneven three-dimensional mechanical properties, long production cycle and unable to meet the requirements of rapid maintenance and low cost of aviation aircraft, the present invention proposes a method different from traditional heat treatment. New heat treatment process

Method used

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  • Wrought aluminum alloy and heat treatment method thereof
  • Wrought aluminum alloy and heat treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] This embodiment provides a heat treatment method for deformed aluminum alloy, such as figure 1 shown.

[0075] The object of heat treatment is a semi-continuously cast rod or slab, and the composition of the semi-continuously cast rod or slab is as follows in terms of mass percentage:

[0076] Zn: 6.0%, Mg: 1.5%;

[0077] Y: 0.3%, Er: 0.04%; Zr: 0.06%; Ti: 0.07%; B: 0.018%;

[0078] The total content of impurities does not exceed 0.1%; of which Cu: 0.04%; Fe: 0.01%; Si: 0.02%;

[0079] The balance is aluminum.

[0080] Among them, W Y / (W Er +W Zr +W Ti ) = 1.76.

[0081] Described heat treatment method comprises the steps:

[0082] 1) Low temperature short time aging treatment:

[0083] At 120°C, aging treatment for 2 hours, continue to heat up to 240°C, aging treatment for 1 hour, and cool at room temperature;

[0084] 2) Multi-stage solid solution treatment:

[0085] Solution treatment at 430°C for 6 hours, continue to heat up to 460°C for solution treatm...

Embodiment 2

[0092] This embodiment provides a heat treatment method for deformed aluminum alloy.

[0093] The heat treatment object has the same composition as the semi-continuous cast rod or slab in Example 1, the only difference being the specific operating conditions of step 3) and step 4) in the heat treatment process.

[0094] Described heat treatment method comprises the steps:

[0095] 1) Low temperature short time aging treatment:

[0096] At 130°C, aging treatment for 1.5h, continue to heat up to 235°C, aging treatment for 1h, room temperature cooling;

[0097] 2) Multi-stage solid solution treatment:

[0098] Solution treatment at 440°C for 4 hours, continue to heat up to 470°C for solution treatment for 4 hours, continue to heat up to 531°C for solution treatment for 1 hour, water quenching, and the quenching transfer time is 5s;

[0099] 3) High temperature aging:

[0100] Aging at 405°C for 0.6h, air cooling;

[0101] 4) Low temperature aging:

[0102] Aging at 130°C fo...

Embodiment 3

[0106] This embodiment provides a heat treatment method for deformed aluminum alloy.

[0107] The heat treatment process is the same as in Example 1, but the composition of the heat treatment object semi-continuous cast rod or slab is as follows (mass percentage):

[0108] Zn: 6.8%, Mg: 1.7%;

[0109] Y: 0.25%, Er: 0.03%; Zr: 0.05%; Ti: 0.07%; B: 0.03%;

[0110] The total content of impurities is not more than 0.1%; Cu: 0.04%; Fe: 0.03%; Si: 0.01%;

[0111] The balance is aluminum.

[0112] Among them, W Y / (W Er +W Zr +W Ti ) = 1.66.

[0113] Described heat treatment method comprises the steps:

[0114] 1) Low temperature short time aging treatment:

[0115] At 120°C, aging treatment for 2 hours, continue to heat up to 240°C, aging treatment for 1 hour, and cool at room temperature;

[0116] 2) Multi-stage solid solution treatment:

[0117] Solution treatment at 430°C for 6 hours, continue to heat up to 460°C for solution treatment for 5 hours, continue to heat up ...

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Abstract

The invention relates to the technical field of wrought aluminum alloy heat treatment, in particular to wrought aluminum alloy and a heat treatment method thereof. The heat treatment method of the wrought aluminum alloy comprises the following steps: firstly carrying out high-temperature aging on a cast rod or a slab ingot, and then carrying out low-temperature aging. According to the method, grain growth can be effectively inhibited, the supersaturation degree of solute elements is fully improved, the eta'phase and the Al3 (Y, Er, Zr and Ti) phase separated out from a matrix are dispersed and fine, the body performance is greatly improved, and meanwhile coarse grain boundary separation is avoided; therefore, the obtained wrought aluminum alloy is small in structure anisotropy and uniform in anisotropic mechanical property and fracture toughness, and the application range of the wrought aluminum alloy is further widened. Meanwhile, the heat treatment method is low in production cost and short in period, and the problems that an existing wrought aluminum alloy is insufficient in mechanical property and fracture toughness, uneven in three-dimensional mechanical property and long in production period, and the requirements for rapid maintenance and low cost of aviation aircrafts cannot be met are solved.

Description

technical field [0001] The invention relates to the technical field of heat treatment of deformed aluminum alloys, in particular to a deformed aluminum alloy and a heat treatment method thereof. Background technique [0002] The 7xxx series aluminum alloy is a kind of high-strength wrought aluminum alloy that can be strengthened by heat treatment. It has high strength, good toughness and good stress corrosion resistance. Important parts such as joint parts. [0003] With the gradual increase in the lightweight and mobility requirements of weapons and equipment, the load-bearing conditions and service environment requirements of parts during service are becoming more and more stringent, which requires the mechanical properties of parts to be higher and more uniform, especially for aircraft maintenance parts. Short lead times and lower costs are required for replacement parts. [0004] For 7xxx series aluminum alloys, semi-continuous cast rods or slabs are usually used as ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22F1/053C21D9/00
CPCC22C21/10C22F1/002C22F1/053C21D9/0075C21D9/0081
Inventor 刘鹏袁雨青虞大联付善强张敏
Owner CRRC QINGDAO SIFANG CO LTD
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