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Multi-stage homogenization heat treatment method for Zn-containing 6XXX series aluminum alloy

A technology for homogenizing heat treatment and aluminum alloys. It is applied in the field of multi-level homogenization heat treatment and heat treatment of 6XXX series aluminum alloys. , to achieve the effect of improving the organization, promoting uniform and fine precipitation, and excellent microstructure

Active Publication Date: 2015-06-17
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are few reports on the homogenization heat treatment method of 6XXX series aluminum alloys containing Zn
The traditional homogenization heat treatment method of 6XXX series aluminum alloys mostly adopts a single-stage homogenization heat treatment process in the temperature range of 520-550 °C for 24-72 hours. The structure of the Zn-containing 6XXX series aluminum alloys treated by this method is not ideal, and it is easy to There is a slight overheating of the tissue, and the second phase with a high melting point is not fully redissolved, A1 3 Zr particle size is coarse, unevenly distributed, and loses the effect of pinning the grain boundary, which directly affects the performance of the material
Simple two-stage or multi-stage homogenization heat treatment method is used to treat Zn-containing 6XXX series aluminum alloys, but the structure is still not ideal, and some methods are not easy to control and prone to overburning

Method used

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  • Multi-stage homogenization heat treatment method for Zn-containing 6XXX series aluminum alloy
  • Multi-stage homogenization heat treatment method for Zn-containing 6XXX series aluminum alloy
  • Multi-stage homogenization heat treatment method for Zn-containing 6XXX series aluminum alloy

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Experimental program
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Effect test

Embodiment 1

[0030] This embodiment takes alloy A as research object, contains the following components of weight percentage content in alloy A: Mg1.1%, Si1.1%, Zn0.9%, Mn0.2%, Zr0.12%, surplus is A1. Alloy A was produced into slabs with a thickness of 250 mm by semi-continuous casting under industrial conditions. The block samples were cut from the ingot, and the homogenization heat treatment tests of different schemes were carried out. The homogenization heat treatment system is shown in Table 1. Immediately after the homogenization treatment, water cooling is carried out to obtain the characteristic morphology of the structure reflecting the effect of the homogenization heat treatment of the alloy, so as to avoid the influence of a large amount of precipitation of the alloy during the slow cooling process and the second relative result analysis. The analysis test was carried out in accordance with the relevant standards, and the tissue analysis was carried out on the samples after diff...

Embodiment 2

[0037] This embodiment takes alloy B as the research object, containing the following components in weight percent in alloy B: Mg1.1%, Si1.1%, Zn1.8%, Mn0.2%, Zr0.12%, the balance is A1. Alloy B was made into a Φ230mm round ingot by semi-continuous casting under industrial conditions. The block samples were cut from the ingot, and the homogenization heat treatment tests of different schemes were carried out. The homogenization heat treatment system is shown in Table 3. Water cooling is carried out immediately after the homogenization treatment is completed. The analysis test was carried out in accordance with the relevant standards, and the tissue analysis was carried out on the samples after different homogenization treatments, and the results are shown in Table 4.

[0038] Table 3 Alloy B homogenization heat treatment process scheme

[0039]

[0040] Table 4 Microstructure analysis results of alloy B after different homogenization heat treatments

[0041]

[0042] ...

Embodiment 3

[0044] This embodiment takes alloy C as research object, contains the following components of weight percent content in alloy C: Mg1.1%, Si1.1%, Zn0.2%, Mn0.2%, Zr0.12%, balance is A1. Alloy C was made into 210 mm thick slabs by semi-continuous casting under industrial conditions. The block samples were cut from the ingot, and the homogenization heat treatment tests of different schemes were carried out. The homogenization heat treatment system is shown in Table 5. Water cooling is carried out immediately after the homogenization treatment is completed. The analysis test was carried out in accordance with the relevant standards, and the tissue analysis was carried out on the samples after different homogenization treatments, and the results are shown in Table 6.

[0045] Table 5 Alloy C homogenization heat treatment process scheme

[0046]

[0047] Table 6 Microstructure analysis results of alloy C after different homogenization heat treatments

[0048]

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Abstract

The invention relates to a multi-stage homogenization heat treatment method for a Zn-containing 6XXX series aluminum alloy, wherein a Zn-containing 6XXX series aluminum alloy casting ingot is placed into a heat treatment heating furnace and the following steps are sequentially performed: (1) carrying out a first-stage homogenization heat treatment, wherein heating is performed to a temperature T1 from a room temperature, a thermal insulation treatment is performed, the thermal insulation time is t1, T1 is more than or equal to 250 DEG C and is less than or equal to 440 DEG C, and t1 is more than or equal to 1 h and is less than or equal to 24 h, (2) carrying out a second-stage homogenization heat treatment, wherein heating is performed to a temperature T2 from the temperature T1, a thermal insulation treatment is performed, the thermal insulation time is t2, T2 is more than or equal to 450 DEG C and is less than or equal to 490 DEG C, and t2 is more than or equal to 1 h and is less than or equal to 24 h, (3) carrying out a third-stage homogenization heat treatment, wherein heating is performed to a temperature T3 from the temperature T2, a thermal insulation treatment is performed, the thermal insulation time is t3, T3 is more than or equal to 510 DEG C and is less than or equal to 580 DEG C, and t3 is more than or equal to 6 h and is less than or equal to 60 h, and (4) cooling to a room temperature from the temperature T3. According to the present invention, through the synergism of the three-stage treatment, the technical defects of the structure of the existing method can be effectively improved, such that the alloy can achieve the good microstructure and the excellent comprehensive performance matching.

Description

technical field [0001] The invention relates to a heat treatment method for 6XXX series (A1-Mg-Si series) aluminum alloys, in particular to a multi-stage homogenization heat treatment method suitable for Zn-containing 6XXX series aluminum alloys, and belongs to the technical field of aluminum alloy heat treatment. Background technique [0002] 6XXX series (A1-Mg-Si series) aluminum alloys are typical heat-treated aluminum alloys that can be strengthened and deformed. Zn-containing 6XXX series aluminum alloys can significantly improve the strength and performance of 6XXX series aluminum alloys because they can add new strengthening phases, especially for rapid aging. It has a wide range of application prospects in the field of transportation and manufacturing. The homogenization treatment of alloy ingots (or castings) is one of the key process links to obtain ideal uniform structure and excellent comprehensive properties of alloys. Reasonable homogenization heat treatment ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/05
Inventor 张永安李锡武熊柏青李志辉刘红伟王锋
Owner GRIMAT ENG INST CO LTD
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