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Method for stress relief annealing and homogenizing annealing of 7000-series aluminum alloy cast ingot

A technology of aluminum alloy ingot casting and homogenization annealing, which is applied in the field of heat treatment of hard aluminum alloys, can solve the problems of aggravated cracking risk, influence, and unsatisfactory remelting effect, so as to improve the treatment effect and reduce the crack generation effect

Active Publication Date: 2021-06-18
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Application Information

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Problems solved by technology

On the other hand, high alloying will lead to the formation of more coarse intermediate phases in the as-cast structure of the alloy. If the remelting effect is not ideal during the homogenization annealing process, it will have a bad influence on the subsequent thermal processing and other processes and aggravate cracking. risk

Method used

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  • Method for stress relief annealing and homogenizing annealing of 7000-series aluminum alloy cast ingot

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[0062] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0063] The experimental methods used in the following examples and comparative examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

[0064] The aluminum alloy slab casting process used in the following examples and comparative examples illustratively includes the following steps: preparing the alloy, after the alloy is completely melted and the temperatur...

Embodiment 1

[0075]The 7050 aluminum alloy flat ingot with the size of 520mm×1620mm is transferred to the heat treatment furnace within 1 hour after casting. The initial temperature of the heat treatment furnace is 400°C, and the ingot is slowly cooled with the furnace at a rate of 50°C / h, and the temperature is lowered to 240°C. The last holding time is 16h; after the holding time is up, the temperature is raised directly for three-stage homogenization annealing treatment: once the temperature is raised to 420°C, the heating rate is 50°C / h, and the constant temperature holding time is 16h; the second time is raised to 465°C, and the heating rate is 50°C / h, holding time at constant temperature for 16 hours; heating up to 470°C three times, with a heating rate of 10°C / h, holding time at constant temperature for 60 hours; after the heat preservation time expires, turn off the power and cool slowly to 230°C with the furnace, then take out the furnace and air cool.

Embodiment 2

[0077] The 7010 aluminum alloy flat ingot with the size of 520mm×1620mm is transferred to the heat treatment furnace within 1 hour after casting. The initial temperature of the heat treatment furnace is 350°C. The last holding time is 12 hours; after the time is up, the temperature is raised directly for three-stage homogenization annealing treatment: once the temperature is raised to 390°C, the heating rate is 100°C / h, and the constant temperature holding time is 12h; the second time is raised to 460°C, and the heating rate is 100°C / h, holding time at constant temperature for 12 hours; heating up to 465~470°C three times, heating rate at 20°C / h, holding time at constant temperature for 48 hours; after the heat preservation time expires, turn off the power and cool slowly with the furnace to 200°C, then take out the furnace and air cool.

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Abstract

The invention provides a method for stress relief annealing and homogenizing annealing of a 7000-series aluminum alloy cast ingot. The method comprises the following steps: designing a continuous treatment process of stress relief annealing and homogenizing annealing from a high-temperature residual temperature stage of cast ingot forming, namely, a smelting process and a direct cooling semi-continuous casting process of a 7000-series aluminum alloy are adopted in a casting process; after casting molding, transferring a cast ingot a heat treatment furnace for slow cooling treatment; carrying out stress relief annealing treatment is carried out at a constant temperature; and finally, performing multi-stage homogenizing annealing treatment after direct heating. By means of the method, the high-low temperature conversion frequency of heating and heat dissipation can be reduced, the cast ingot cracking risk is lowered, energy is saved, and the annealing treatment period is shortened; and meanwhile, the multi-stage homogenizing annealing technology is combined, coarse alloy intermediate phases are forcibly re-melted, so that the cast ingot homogenizing treatment effect is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of hard aluminum alloys, and relates to a method for stress-relief annealing and homogenization annealing of 7000 series aluminum alloy ingots, in particular to a direct-cooling semi-continuous method for large-scale, high-alloyed 7000-series aluminum alloys Continuous treatment method for stress relief annealing and homogenization annealing of flat cast ingots. Background technique [0002] The 7000 series aluminum alloy is a high-strength / ultra-high-strength heat-treatable aluminum alloy, which has the characteristics of high strength, excellent toughness, and good processability. It is one of the most widely used aluminum alloy materials in the aviation industry and is mainly used for the preparation of aircraft structural parts. . With the rapid development of the aviation field, low-cost overall manufacturing is the most important development direction at present, and higher require...

Claims

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Application Information

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IPC IPC(8): C22F1/053
CPCC22F1/053
Inventor 戴圣龙何维维臧金鑫伊琳娜
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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