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Heat treatment technology for 7-series high-strength aluminum alloy

An aluminum alloy, high-strength technology, applied in the heat treatment process of 7-series high-strength aluminum alloys, can solve the problem that the comprehensive mechanical properties of the material are not significantly improved.

Inactive Publication Date: 2015-11-25
HUANGHE S & T COLLEGE
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Problems solved by technology

Due to the early start of research in developed countries, the current research on this type of alloy is very mature. Compared with foreign countries, my country's research on this type of high-strength aluminum alloy is no matter in terms of basic theory, process technology, or the degree of perfection of the technical level. There is a big gap between countries, and the research on heat treatment process is mostly based on the traditional single heat treatment process, most of which can improve a certain property of the material, and the improvement of the comprehensive mechanical properties of the material is not obvious

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  • Heat treatment technology for 7-series high-strength aluminum alloy
  • Heat treatment technology for 7-series high-strength aluminum alloy
  • Heat treatment technology for 7-series high-strength aluminum alloy

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Embodiment 1

[0029] A heat treatment process for a 7-series high-strength aluminum alloy, taking 7075 alloy as an example, the steps are as follows:

[0030] Table 17 Chemical composition of materials (mass fraction, %)

[0031]

[0032] Solution treatment

[0033] The solid solution is carried out in the box-type resistance furnace SX2-12-10. The furnace is installed at room temperature and the heating method is raised with the temperature of the furnace, and a thermocouple is introduced for temperature monitoring. At 470°C and holding for 60 minutes, the peak value appeared, and the tensile strength, yield strength and hardness reached 635MPa, 560MPa and 46.5HRB respectively. The strength and microhardness variation curve of the alloy at the solution temperature, such as figure 1 , figure 2 shown, where R m is the yield strength, R p is the tensile strength. After solution treatment, the sample was placed in 0.32wt% polyethylether aqueous solution and rapidly cooled to room tem...

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Abstract

The invention relates to a heat treatment technology for a 7-series high-strength aluminum alloy, and belongs to the technical field of aluminum alloy heat treatment. The heat treatment technology includes the steps that solution treatment is firstly carried out, wherein the solution treatment temperature is 470+ / -5 DEG C, and the solution treatment time is 60+ / -20 min; then initial aging treatment, shape change treatment and final aging treatment are then carried out, wherein the initial aging treatment is carried out at the temperature being 130+ / -5 DEG C, and the initial aging treatment time ranges from 9 h to 39 h; stretchable shape change treatment is carried out at the room temperature, wherein the shape change amount ranges from 35% to 45%; and final aging treatment is carried out at the temperature being 120+ / -5 DEG C, wherein the final aging treatment time ranges from 4 h to 20 h. The alloy obtained after heat treatment is even and fine in grain, the recrystallization degree is higher, and an obvious precipitated phase can be seen. The strength of the alloy reaches 683 MPa, the hardness reaches 87.2 HRB, and the elongation rate reaches 16.8%; and compared with a traditional single heat treatment technology, the strength of the alloy is improved, and the ductility and the toughness of the alloy are improved to a large extent.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy heat treatment, and in particular relates to a heat treatment process for a 7-series high-strength aluminum alloy. Background technique [0002] 7-series alloys are heat-treatable and strengthened alloys, which are widely used in aerospace, military equipment and related civil industries. Due to the early start of research in developed countries, the current research on this type of alloy is very mature. Compared with foreign countries, my country's research on this type of high-strength aluminum alloy is no matter in terms of basic theory, process technology, or the degree of perfection of the technical level. There is a big gap between countries, and the research on heat treatment process is mostly based on the traditional single heat treatment process, most of which can improve a certain property of the material, and the improvement of the comprehensive mechanical properties of the materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/053
Inventor 李慧杨汉嵩秦国帅郝红英何春霞刘权孙晨磊闫雷鸣
Owner HUANGHE S & T COLLEGE
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