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Homogenizing heat treatment method for 7xxx series aluminum alloy with low Cu content

A technology of homogenizing heat treatment and aluminum alloy, applied in the field of metal heat treatment, it can solve problems such as long holding time, and achieve the effect of high efficiency, saving heat treatment time, and speeding up the resolubilization speed.

Active Publication Date: 2022-07-08
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the upper limit of the second-stage temperature of the traditional two-stage homogenization process is 460-475°C, which requires a longer holding time. Therefore, it is necessary to propose a simpler treatment method that can achieve the homogenization effect in a shorter time

Method used

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  • Homogenizing heat treatment method for 7xxx series aluminum alloy with low Cu content
  • Homogenizing heat treatment method for 7xxx series aluminum alloy with low Cu content
  • Homogenizing heat treatment method for 7xxx series aluminum alloy with low Cu content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The aluminum alloy composition is Al-4.5Zn-1.0Mg-0.2Cu-0.25Mn-0.25Cr-0.20Fe-0.20Si (wt.%), and the ingot size is Φ220mm.

[0038]The alloy is homogenized by the method of the present invention, and the specific process is as follows: starting from room temperature at a heating rate of 400°C / h, and the heating rate gradually decreases; when the alloy temperature reaches 400°C, the heating rate is reduced to 15°C / h; When the alloy temperature reaches 430°C, the heating rate is reduced to 10°C / h; when the alloy temperature reaches 465°C, the heating rate is reduced to 5°C / h; when the alloy temperature reaches 475°C, the heating rate is reduced to 2°C / h, which takes 2h ; The overall heating time is 14h. It was then incubated at 475°C for 15h.

[0039] like figure 2 As shown in the figure, it is the metallographic structure of the alloy of Example 1 after the heating process is completed. It can be seen from the figure that the second phase has been redissolved to a certa...

Embodiment 2

[0047] The ingot used in Example 1 is used for homogenization treatment, and the specific process is as follows: the heating process is the same as that in Example 1, and then the temperature is kept at 475° C. for 18 hours.

Embodiment 3

[0049] The ingot used in Example 1 is used for homogenization treatment, and the specific process is as follows: starting from room temperature at a heating rate of 350 °C / h, and the heating rate gradually decreases; when the alloy temperature reaches 400 °C, the heating rate is reduced to 10 °C / h ; When the alloy temperature reaches 430°C, the heating rate is reduced to 5°C / h; when the alloy temperature reaches 465°C, the heating rate is reduced to 2°C / h, and the heating rate is maintained, and the temperature is raised to 475°C for 4h; the overall heating time is 18h. It was then incubated at 475°C for 15h.

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Abstract

The invention relates to a homogenization heat treatment method for a low-Cu-content 7xxx series aluminum alloy, and belongs to the technical field of metal heat treatment. The method comprises the following steps: (1) a temperature rising stage: the alloy is subjected to a temperature rising process with a gradually reduced temperature rising rate, so that a dispersed phase is uniformly separated out, and the initial melting temperature of an AlZnMgCu phase is increased; and (2) a heat preservation stage: the alloy is subjected to a homogenization heat preservation process, so that the AlZnMgCu phase is redissolved. According to the homogenizing heat treatment method, the initial melting temperature of the quaternary phase can be effectively increased, rapid redissolution of the quaternary phase is achieved, the heat treatment time is saved, and meanwhile it can be ensured that the size and number density of the precipitated dispersed phase meet the requirements. More importantly, the method is simple in process control, strong in operability and high in heat treatment efficiency, can achieve the effect of conventional two-stage homogenization treatment, and is particularly suitable for homogenization treatment of industrial large-specification cast ingots.

Description

technical field [0001] The invention relates to a method for homogenizing heat treatment of 7xxx series aluminum alloys with low Cu content, and belongs to the technical field of metal heat treatment. Background technique [0002] 7xxx series aluminum alloys have high strength, high toughness, good corrosion resistance, easy processing and other properties, and are widely used in aerospace, oil drilling, transportation and other fields. Generally speaking, there is obvious dendrite segregation in the as-cast structure of 7xxx series alloys, and a large number of coarse eutectic structures exist at the grain boundaries in the matrix in a network structure, resulting in uneven structure and composition of the alloy. In the subsequent deformation process, stress concentration is likely to occur at the intersection between the eutectic structure and the matrix, and then cracks are generated, which seriously affects the properties of the alloy. Therefore, it is very important to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/053C22C21/10
CPCC22F1/053C22F1/002C22C21/10Y02P10/25
Inventor 温凯李锡武李亚楠熊柏青李志辉张永安闫丽珍闫宏伟石国辉刘红伟
Owner GRIMAT ENG INST CO LTD
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