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Improved 7000 series aluminum alloy double-stage overaging heat treatment technology

An aluminum alloy, overaging technology, applied to the heat treatment of 7000 series (Al-Zn-Mg-Cu series) aluminum alloys, the improved 7000 series aluminum alloy double-stage overaging heat treatment process, which can solve the problem of low production efficiency and poor operation Difficulty, long process flow, etc., to achieve high production efficiency, good overall performance matching, and short process flow

Active Publication Date: 2012-11-28
GRIMAT ENG INST CO LTD
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  • Description
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Problems solved by technology

[0004] However, since T77 aging includes three-stage aging treatment, the process flow is longer, and quenching treatment is required after the second-stage high-temperature regression treatment, which leads to the need for T77 aging to use a special furnace that is more complicated and requires higher precision than traditional aging furnaces. aging furnace, and the three-stage aging needs to be carried out on different aging furnaces separately, which brings greater operational difficulty to the operation under industrial conditions and lower production efficiency

Method used

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  • Improved 7000 series aluminum alloy double-stage overaging heat treatment technology
  • Improved 7000 series aluminum alloy double-stage overaging heat treatment technology
  • Improved 7000 series aluminum alloy double-stage overaging heat treatment technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Al-6.5Zn-2.3Mg-2.1Cu-0.12Zr alloy is configured, and a solution quenched state with a thickness of 40mm is obtained through smelting, semi-continuous casting, homogenization annealing, rolling, solution quenching, pre-stretching and other processes ( T351 state) plates, block samples were cut from the plates for aging treatment tests of different schemes, and the aging process schemes are shown in Table 1. According to relevant test standards, the tensile mechanical properties, electrical conductivity, fracture toughness, and exfoliation corrosion properties of samples with different aging treatments were tested, and the results are shown in Table 2.

[0029] An improved 7000 series aluminum alloy double-stage overaging heat treatment process, the method mainly includes the following process steps as figure 1 As shown, the range of its main parameters: (1) The pre-aging in the low temperature zone includes two stages of aging and heat preservation process, that is, at T...

Embodiment 2

[0043] Configure Al-6.2Zn-2.8Mg-1.6Cu-0.16Cr-0.31Mn alloy, through melting, semi-continuous casting, homogenization annealing, rolling, solution quenching, pre-stretching and other processes to obtain a thickness of 40mm solution quenching The thick plate in state (T351 state) is used to carry out aging treatment tests of different schemes, and the aging process scheme and its properties are shown in Table 3. According to the relevant test standards, the tensile mechanical properties, electrical conductivity, stress corrosion resistance, exfoliation corrosion properties, and fracture toughness of the samples with different aging treatments were tested. The results are shown in Table 4.

[0044] table 3

[0045]

[0046] Table 4

[0047]

[0048]

[0049] From the performance test results in Examples 1 and 2 (Table 2 and Table 4), it can be seen that whether it is Al-6.5Zn-2.3Mg-2.1Cu-0.12Zr alloy T351 plate or Al-6.2Zn-2.8Mg-1.6 Cu-0.16Cr-0.31Mn alloy T351 plate, af...

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Abstract

The invention discloses an improved 7000 series aluminum alloy double-stage overaging heat treatment technology, the method divides the preaging in a low temperature zone into a low temperature phase and a high temperature phase orderly for performing pre-nucleation treatment, and then is continuously heated to a high-temperature region for final stabilizing aging treatment. The two phases preaging technical scheme that the low temperature is first and the high temperature is second is employed by aiming the defects and disadvantages of the heat treatment technology of 7000 series aluminum alloy double-stage overaging (T73, T74, T76 and T79), simultaneously, the technical scheme of high-temperature region aging treatment which is completely different from a T7x double-stage overaging technology is employed, the cooperation of an intra-grain precipitate phase and a grain boundary precipitated phase can be realized. Compared with a traditional T73, T74, T76 and T79 double-stage overaging system, the heat treatment technology can obviously enhance the corrosion resisting performance and the fracture toughness property of the 7000 series aluminum alloy under the prerequisite that equivalent strength level is kept, the total insulation time of aging treatment is reduced, and the production efficiency is increased.

Description

technical field [0001] The heat treatment method of the aluminum alloy in the technical field involved in the present invention, especially the heat treatment method of the 7000 series (Al-Zn-Mg-Cu series) aluminum alloy registered by the International Aluminum Association and the China Nonferrous Metals Standardization Technical Committee; more Specifically, the present invention relates to an improved 7000 series aluminum alloy double-stage overaging heat treatment process. Background technique [0002] 7xxx series (Al-Zn-Mg-Cu series) aluminum alloys are typical heat-treatable aluminum alloys, and the aging process is one of the most critical processes for achieving high strength and matching other comprehensive properties. For this reason, since the birth of the first practical 7xxx aluminum alloy in the 1950s, material workers have been committed to developing a new aging process that can improve the structural properties. Before the 1960s, the aging system commonly us...

Claims

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Application Information

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IPC IPC(8): C22F1/053
Inventor 李志辉熊柏青张永安李锡武刘红伟王锋
Owner GRIMAT ENG INST CO LTD
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