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A composite preparation method for improving the mechanical properties of 6xxx aluminum alloy coils

A technology of mechanical properties and aluminum alloys, applied in metal rolling, manufacturing tools, temperature control, etc., can solve problems such as large energy consumption, and achieve the effects of cost saving, reduction of aging treatment temperature, and excellent mechanical and mechanical properties.

Active Publication Date: 2020-12-01
CENT SOUTH UNIV
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  • Application Information

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Problems solved by technology

However, the lower the cryogenic temperature, the greater the energy consumption

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  • A composite preparation method for improving the mechanical properties of 6xxx aluminum alloy coils

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Embodiment Construction

[0019] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0020] The invention discloses a compound preparation method for improving the mechanical properties of 6XXX aluminum alloy coils, the main principle of which is to effectively combine fine grain strengthening and precipitation strengthening to realize performance enhancement of 6XXX aluminum alloy coils. Cryogenic rolling is carried out at around -100°C to achieve grain size refinement of 6XXX aluminum alloy, and at the same time, avoid the primary inclusions in 6XXX aluminum alloy being brittle at too low temperature and form microcrack sources during rolling deformation. At the same time, aging treatment is carried out at 95-125°C to effectively ensure that the ultra-fine grain structure produced by cryogenic rolling deformation does not recrystallize. However, it reduces the dislocation density in the aluminum alloy and realizes the generatio...

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Abstract

The invention discloses a composite preparing method for improving the mechanical property of a 6XXX aluminum alloy coiled material. The 6XXX aluminum alloy coiled material treated through solution treatment and ageing is put into a deep cooling box, cooling nitrogen is adopted for cooling, the temperature is -110 DEG C to -90 DEG C, a deep cooling roller is started, the temperature of the rolleris controlled to range from -110 DEG C to -90 DEG C, the 6XXX aluminum alloy coiled material which is evenly cooled is subjected to deep cooling rolling, the 6XXX aluminum alloy coiled material obtained after deep cooling rolling is put into the deep cooling box gain, cooling nitrogen is adopted for cooling, repeated operation is carried out until the whole rolling reduction rate reaches 70 to 90%, the rolled 6XXX aluminum alloy coiled material is subjected to ageing treatment in a heating furnace, the ageing treatment temperature is controlled to range from 95 to 125 DEG C, and the heat preservation time is 12 to 40 hours. Deep cooling rolling about -100 DEG C and low-temperature ageing treatment is adopted, the material strength is improved while the ageing treatment temperature is reduced, the deep cooling treatment energy consumption is saved, and the manufacturing cost is reduced, and the mechanical property of the obtained 6XXX aluminum alloy coiled material exceeds that of an alloy strip prepared through ultra-low-temperature deep cooling rolling and room temperature cold rolling.

Description

technical field [0001] The invention belongs to the technical field of metal material rolling, in particular to a composite preparation method for improving the mechanical properties of 6XXX aluminum alloy coils. Background technique [0002] 6XXX aluminum alloys are the most used aluminum alloys in automobiles. However, since the strength of the current 6XXX aluminum alloys is directly related to the aging treatment process of the 6XXX alloys. Generally, the aging treatment is carried out for a long time in the temperature range of 150°C to 200°C. Since the aging treatment temperature is high and the time is very long, if the aging treatment temperature can be lowered, it has important economic significance for energy saving. [0003] At the same time, the ultra-fine-grained 6XXX aluminum alloy material has very good strength, and its application in automobile lightweight is of great significance. For parts with the same strength requirements, we can reduce the thickness...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B3/00B21B37/74B21B37/58C22F1/04C21D9/573
CPCB21B3/00B21B37/58B21B37/74B21B2003/001C21D9/573C22F1/04
Inventor 喻海良刘粤王晗
Owner CENT SOUTH UNIV
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