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A spray quenching process suitable for aluminum alloy plates

A technology of aluminum alloy sheet and aluminum alloy material, which is applied in the field of spray quenching process of aluminum alloy sheet, can solve the problems such as hindering the spray cooling production work of aluminum thick plate, large residual stress, etc., and achieves the promotion of high-quality production, small residual effect of stress

Active Publication Date: 2021-04-30
西安兴航航空科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the quenching process of aluminum thick plates, there are often multiple precipitation reaction stages, and the minimum critical rate of each stage is not consistent. The spray quenching process determined by the above two methods is likely to cause relatively large residual stress, which undoubtedly seriously hinders the aluminum alloy reaction process. Spray cooling production work for thick plates

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  • A spray quenching process suitable for aluminum alloy plates

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Effect test

Embodiment 1

[0035]AA7150 aluminum alloy (solid solution temperature 480 ° C) plate spray quenching, thick plate thickness of 80 mm, the material exists in three precipitation reaction stages, respectively, P1Stage (455 ° C, 350 ° C) minimum critical cooling rate Cr110 ° C / s, p2Stage (350 ° C, 255 ° C) minimum critical cooling rate Cr280 ° C / s, P3Stage (255 ° C, 150 ° C) minimum critical cooling rate Cr3300 ° C / s;

[0036]Thereby, the cooling curve of the aluminum thick plate is designed to be 5, ie Q0Stage (480 ° C, 455 ° C) cooling rate is a air cooling rate CRAir , Q1, Q2, Q3The temperature range of the stage is (455 ° C, 350 ° C), (350 ° C, 255 ° C), (255 ° C, 150 ° C), Q1Stage cooling rate is 10 ° C / s, Q2Stage cooling rate is 80 ° C / s, Q3Stage cooling rate is 300 ° C / s, Q4Stage (150 ° C, room temperature) cooling rate is a air cooling rate CRAir ;

[0037]When the industrial tap water in 20 ° C is a cooling medium, nozzle water-free injection occurs, due to Q1Stage cooling rate 10 ° C...

Embodiment 2

[0039]AA2618 Aluminum alloy (solid solution temperature 530 ° C) sheet quenching, plate thickness 80mm, the material exists in two precipitation reaction stages, respectively P1Stage (390 ° C, 280 ° C) minimum critical cooling rate Cr120 ° C / s, p2Stage (280 ° C, 170 ° C) minimum critical cooling rate CR2100 ° C / s;

[0040]Thereby, the cooling curve of the aluminum thick plate is designed as 4, ie Q0Stage (530 ° C, 390 ° C) cooling rate is an air cooling rate CRAir , Q1, Q2The temperature range of the stage is (390 ° C, 280 ° C), (280 ° C, 170 ° C), Q1Stage cooling rate is 20 ° C / s, Q2Stage cooling rate is 100 ° C / s, Q3Stage (170 ° C, room temperature) cooling rate is an air cooling rate CRAir ;

[0041]When the industrial tap water in 20 ° C is a cooling medium, the nozzle is water injection, 14S-19.5S, nozzle, no water, no water, cooling, 19.5 S-20.6S, nozzle pressure 100kpa, spray Volume flux is 400Lm-2⋅-1, 20.6S-35.6S, nozzle no water injection.

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Abstract

The spray quenching process applicable to aluminum alloy plates of the present invention determines the temperature range according to the temperature ranges of multiple precipitation reaction stages contained in the continuous precipitation curve CCP of aluminum alloy materials and the minimum critical cooling rate of each precipitation reaction stage The cooling rate adjustment stage of the aluminum alloy sheet is consistent with the temperature range of the precipitation reaction stage, and the cooling rate is consistent with the minimum critical cooling rate. According to this cooling method, the aluminum alloy sheet workpiece is cooled, and the obtained aluminum alloy sheet has higher mechanical properties. performance and lower residual stress, which changed the disadvantages of large residual stress caused by quenching aluminum plate with the same cooling rate in the past, and the problem of excessive residual stress caused by the discontinuity of step quenching + isothermal heat preservation method. The high-quality production of aluminum thick plates for aerospace is of great significance.

Description

Technical field[0001]The present invention relates to a spray quenching process of an aluminum alloy sheet, and more particularly, to a spray quenching process suitable for use in an aluminum alloy sheet based on the minimum critical cooling rate of the reaction stage.Background technique[0002]With the continuous innovation of the aircraft design ideas, the aviation overall structural parts that meet the lightweight, high quality and efficient production needs of key components can continue to be favored. Among the advanced materials used in the aircraft, the aluminum alloy material has a large number of applications in aviation overall structural parts due to its high-aluminum alloy materials, high corrosion resistance and high corrosion resistance, and low cost, and low cost, such as airplane fuselage boxes, fuselage An important part of the septum, spar, and ribs.[0003]Aviation overall structural parts generally obtained 90% of the aluminum alloy plates to obtain a material resec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/667C21D9/00C22F1/04
CPCC21D1/667C21D9/0062C21D9/0081C22F1/002C22F1/04
Inventor 郭瑞超解传梅姚延立张循利
Owner 西安兴航航空科技股份有限公司
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