6XXX series aluminum alloy and aging process thereof

An aluminum alloy and aging technology, which is applied in the field of aluminum alloy processing to solve the scheduling problem and improve the mechanical properties

Active Publication Date: 2020-03-27
CRRC QINGDAO SIFANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aging process of the present invention eliminates the problem of quenching parking effect in the quenching process of 6XXX series aluminum alloys, and improves the final mechanical properties of the aluminum alloy; moreover, the aging process of the present invention is not affected by parking, which solves the scheduling of production tasks of enterprises The problem is that it can meet the needs of enterprises to produce high-performance 6XXX series aluminum alloys while meeting the scientific scheduling and cost control of production tasks.

Method used

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  • 6XXX series aluminum alloy and aging process thereof
  • 6XXX series aluminum alloy and aging process thereof
  • 6XXX series aluminum alloy and aging process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a preparation of an aluminum alloy extruded profile, comprising the following steps:

[0029] The composition of the aluminum alloy extrusion profile is designed as: Si: 1.4wt.%, Fe: 0.4wt.%, Cu: 0.1wt.%, Mn: 0.6wt.%, Mg: 0.7wt.%, Cr: ≤0.1wt. .%, Zn: ≤0.05wt.%, Ti: ≤0.1wt.%, the balance is Al, and the sum of the weight percentages of each component is 100%.

[0030] (1) Extrusion and quenching process:

[0031] Heat the ingot to 520°C, then extrude at a rate of 5m / min, so that the extrusion outlet temperature is about 550°C, then quench with water at room temperature online, and park for 24h;

[0032] The wall thickness of the obtained aluminum alloy extruded profile is 5 mm, and the extrusion ratio is about 20.

[0033] (2) Pre-aging treatment: after 5 hours of heat preservation at 100°C, take out of the oven and park for 7 days;

[0034] (3) Artificial aging: after holding at 175°C for 5 hours; the final mechanical properties of the obtaine...

Embodiment 2

[0038] This embodiment provides a preparation of an aluminum alloy extruded profile, comprising the following steps:

[0039] The composition of the aluminum alloy extrusion profile is designed as: Si: 1.4wt.%, Fe: 0.4wt.%, Cu: 0.1wt.%, Mn: 0.6wt.%, Mg: 0.7wt.%, Cr: ≤0.1wt. .%, Zn: ≤0.05wt.%, Ti: ≤0.1wt.%, the balance is Al, and the sum of the weight percentages of each component is 100%.

[0040] (1) Extrusion and quenching process:

[0041] Firstly, the ingot is heated to 510°C, and then extruded at a rate of 5m / min, so that the extrusion outlet temperature is about 540°C, followed by online room temperature water quenching;

[0042] The wall thickness of the obtained aluminum alloy extruded profile is 5 mm, and the extrusion ratio is about 20.

[0043] (2) Pre-aging treatment: Pre-aging immediately after quenching, after 3 hours of heat preservation at 120°C;

[0044] (3) Artificial aging: heat preservation at 175°C for 5 hours; the final mechanical properties of the obt...

Embodiment 3

[0046] This embodiment provides a preparation of an aluminum alloy extruded profile, comprising the following steps:

[0047] The composition of the aluminum alloy extrusion profile is designed as: Si: 1.1wt.%, Fe: 0.18wt.%, Cu: 0.04wt.%, Mn: 0.62wt.%, Mg: 0.77wt.%, Cr: ≤0.1wt. .%, Zn: ≤0.05wt.%, Ti: ≤0.1wt.%, the balance is Al, and the sum of the weight percentages of each component is 100%;

[0048] (1) Extrusion and quenching process:

[0049] Firstly, the ingot is heated to 510°C, and then extruded at a rate of 5m / min, so that the extrusion outlet temperature is about 540°C, followed by online room temperature water quenching;

[0050]The wall thickness of the obtained aluminum alloy extruded profile is 5 mm, and the extrusion ratio is about 20.

[0051] (2) Pre-aging treatment: Pre-aging immediately after quenching, after 120 ° C for 3 hours, park for 15 days;

[0052] (3) Artificial aging: heat preservation at 175°C for 7 hours; the final mechanical properties of the ...

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Abstract

The invention belongs to the technical field of aluminum alloy processing, and particularly relates to a 6XXX series aluminum alloy and an aging process thereof. The aging process of the 6XXX series aluminum alloy comprises first-stage low-temperature pre-aging and second-stage high-temperature aging, wherein the temperature of the first-stage low-temperature pre-aging is 80 to 150 DEG C. The low-temperature pre-aging treatment provided by the invention, on the one hand, causes a large number of pre-beta" phases to be dispersively distributed in the alloy, and these pre-beta" phases are directly transformed into beta" phases in a subsequent aging process; on the other hand, the size of nano-scale atomic clusters formed in an original parking process is further increased, so that the nano-scale atomic clusters can provide nucleation positions for the nucleation of the beta" phases in the subsequent aging process; therefore, the precipitation density of the beta" phases in the final agedalloy is promoted, the uniform distribution of the beta" phases is promoted, the purpose of eliminating the quenching and parking effect is achieved, and at the same time, the final mechanical properties of the aluminum alloy are improved, and the task scheduling problem caused by the production capacity limitation of an enterprise is solved.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy processing, and in particular relates to a 6XXX series aluminum alloy and an aging process thereof. Background technique [0002] In the preparation process of 6XXX series aluminum alloys, aging heat treatment plays a decisive role in the formation of the properties of aluminum alloys. However, since the 6XXX series aluminum alloys tend to have a large natural aging tendency, if the aging heat treatment cannot be performed immediately after the aluminum alloy is solidified and quenched, it will have an adverse effect on the aging strengthening ability of the aluminum alloy, which is the so-called quenching parking effect. [0003] However, in the actual production process, due to the limitation of production capacity, it is often impossible to arrange aging heat treatment immediately after extrusion production, which limits the aging strengthening ability of aluminum alloy materials and red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22F1/043
CPCC22C21/02C22F1/002C22F1/043
Inventor 田爱琴孙琳郭志成高玉龙丁叁叁
Owner CRRC QINGDAO SIFANG CO LTD
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