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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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 an

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

Example Embodiment

[0027] Example 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 melting, semi-continuous casting, homogenization annealing, rolling, solution quenching, pre-stretching and other processes ( T351 state) plate, cut a block sample from the plate, and use it to carry out the aging treatment test of different schemes. The aging process scheme and its scheme are shown in Table 1. According to relevant test standards, the tensile mechanical properties, electrical conductivity, fracture toughness, and exfoliation corrosion properties of the samples after different aging treatments were tested. The results are shown in Table 2.

[0029] An improved two-stage over-aging heat treatment process for 7000 series aluminum alloy. The method mainly includes the following process steps: figure 1 As shown, the main parameter range: (1) Pre-aging in the low temperature zone includes two stages of aging and heat pres...

Example Embodiment

[0042] Example 2

[0043] Al-6.2Zn-2.8Mg-1.6Cu-0.16Cr-0.31Mn alloy is configured, and the thickness of 40mm is obtained by melting, semi-continuous casting, homogenization annealing, rolling, solution quenching, pre-stretching and other processes. The aging process plan and its aging process plan are shown in Table 3. In accordance with relevant test standards, the tensile mechanical properties, electrical conductivity, stress corrosion resistance, spalling corrosion resistance, and fracture toughness of the samples after 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, 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 sheet, after aging treatment with the technical scheme of the present invention, when the strength level is basically equi...

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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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