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A heat treatment method for improving the microstructure and properties of 7xxx series aluminum alloys

A heat treatment method and aluminum alloy technology, which is applied in the heat treatment of 7xxx series aluminum alloys, and in the field of heat treatment to improve the structure and performance of 7xxx series aluminum alloys, can solve the problems of large quenching residual stress, machining deformation of alloy structural parts out of tolerance, etc., to achieve Reduction of quenching residual stress, improvement of production efficiency, and strong operability

Active Publication Date: 2022-05-27
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adopting the fastest possible quenching and cooling rate is beneficial to obtain higher strength, but at the same time it will bring larger quenching residual stress, which is easy to cause problems such as out-of-tolerance machining deformation of alloy structural parts

Method used

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  • A heat treatment method for improving the microstructure and properties of 7xxx series aluminum alloys
  • A heat treatment method for improving the microstructure and properties of 7xxx series aluminum alloys
  • A heat treatment method for improving the microstructure and properties of 7xxx series aluminum alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this embodiment, a 25mm plate of 7055 alloy (Al-8.0Zn-2.3Cu-2.0Mg-0.16Zr) is used as the research object. The solution treatment system of the hot-rolled 7055 alloy plate is 470°C / 2h+475°C / 2h, the pre-stretch deformation is 2.0%, and different schemes of staged quenching and single-stage aging heat treatment are adopted. The heat treatment system is shown in Table 3 . The properties of the plates after different heat treatments were tested, and the results are shown in Table 4.

[0038] table 3

[0039]

[0040] Table 4

[0041]

Embodiment 2

[0043] In this embodiment, a 78mm plate of 7050 alloy (Al-6.2Zn-2.3Cu-2.2Mg-0.12Zr) is used as the research object. The solution treatment system of the hot-rolled 7055 alloy plate is 470°C / 3h+480°C / 1h, the pre-stretch deformation is 2.3%, and different schemes of staged quenching and single-stage aging heat treatment are adopted. The heat treatment system is shown in Table 5 . The properties of the plates after different heat treatments were tested, and the results are shown in Table 6.

[0044] table 5

[0045]

[0046] Table 6

[0047]

Embodiment 3

[0049] In this embodiment, a 152mm plate of 7085 alloy (Al-7.5Zn-1.6Cu-1.5Mg-0.12Zr) is used as the research object. The solution treatment system of the hot-rolled 7085 alloy plate is 475°C / 2h, and the pre-stretching deformation is 2.5%. Different schemes of staged quenching and single-stage aging heat treatment are adopted. The heat treatment system is shown in Table 7. The properties of the plates after different heat treatments were tested, and the results are shown in Table 8.

[0050] Table 7

[0051]

[0052] Table 8

[0053]

[0054]

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Abstract

A heat treatment method for improving the microstructure and properties of 7xxx series aluminum alloys, comprising: first performing single-stage or hierarchical solid solution heat preservation heat treatment on the deformed form, and the final solution heat treatment heat preservation temperature is T 1 , where, 460℃≤T 1 ≤485℃; the alloy is cooled at an average cooling rate V 1 by T 1 The temperature point is cooled to temperature T 2 , followed by an average cooling rate V 2 from T 2 The temperature point is cooled to room temperature, where, 150℃≤T 2 ≤190℃, 20℃ / s≤V 1 ≤60℃ / s, 3℃ / s≤V 2 ≤10°C / s; the quenched aluminum alloy is subjected to 1-5% cold deformation treatment, and then at T 3 Holding time at temperature t 1 Carry out aging heat treatment, where 110℃≤T 3 ≤140℃, 10h≤t 1 ≤32h. The method of the invention can make the 7xxx series aluminum alloy obtain a relatively ideal precipitated phase structure under the condition of controlling the residual stress, and obtain a good match between strength, toughness and corrosion resistance. Compared with the existing technology, the method greatly shortens the heat treatment time, and has the characteristics of simple operation, high efficiency and feasibility.

Description

technical field [0001] The invention relates to a heat treatment method for 7xxx series (Al-Zn-Mg-Cu series) aluminum alloys, more specifically, relates to a heat treatment method for improving the microstructure and performance of 7xxx series aluminum alloys, and belongs to the technical field of aluminum alloy heat treatment. Background technique [0002] 7xxx series (Al-Zn-Mg-Cu series) aluminum alloys are typical heat-treated aluminum alloys that can be strengthened. Solution, quenching, pre-stretching and aging treatment are the key process steps to obtain the ideal uniform structure and excellent comprehensive properties of the alloy. In order to obtain the 7xxx series aluminum alloy with good comprehensive properties, it is required that the strengthening elements of the alloy fully dissolve back into the matrix during solution treatment; after aging treatment, the alloy finally forms small, numerous and densely distributed intragranular precipitates , and grain bound...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/053
CPCC22F1/053C22F1/002
Inventor 李锡武熊柏青温凯李志辉李亚楠张永安闫丽珍闫宏伟刘红伟
Owner GRIMAT ENG INST CO LTD
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