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Aluminum alloy plate for automobile bodies

An aluminum alloy plate and aluminum alloy technology, applied in the field of aluminum alloy plate, can solve the problems of corrosion resistance and fracture toughness decrease, service safety and service life coefficient decrease, strength decrease, etc., and achieve long strength retention time, service safety and service life The effect of improving, increasing strength

Active Publication Date: 2012-10-17
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, the customer's emphasis on collision safety requires the car body to have higher strength, and the strength of the currently used aluminum materials is mostly lower than 250Mpa or lower after baking paint
Secondly, although the high-silicon content 6××× aluminum alloys currently used have faster precipitation kinetics, the high silicon content is also easy to cause these alloys to be exposed to heat during use (especially radiators, water tanks, and exhausts). The strengthening phase inside the tube) is easy to coarsen and the strength is reduced
In addition, alloys with high silicon content are prone to precipitate larger silicon particles at the grain boundary under heat exposure, causing a decrease in corrosion resistance and fracture toughness. These factors will reduce the service safety and life factor.

Method used

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  • Aluminum alloy plate for automobile bodies
  • Aluminum alloy plate for automobile bodies
  • Aluminum alloy plate for automobile bodies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A aluminum alloy ingot is homogenized in a circulating air resistance furnace at 550°C for 24h, then cut and face milled, hot rolled, intermittently annealed and finally cold rolled into a 1mm thick sheet. After the thin plate is quenched by solution treatment at 560°C×30min in an air circulation resistance furnace, it is immediately treated in an oil bath furnace at 120°C×0.5h to obtain an aluminum alloy plate; and then parked at room temperature for 1 day, 2 weeks, Hardness test and tensile test were carried out after 1 month and 2 months. The simulated paint baking is carried out in an oil bath furnace at a temperature of 180°C×30min. After the paint is baked, the hardness test and tensile test are carried out.

Embodiment 2

[0036] A aluminum alloy ingot is homogenized in a circulating air resistance furnace at 550°C for 24h, then cut and face milled, hot rolled, intermittently annealed and finally cold rolled into a 1mm thick sheet. After the thin plate was quenched by solution treatment at 560°C×30min in an air circulation resistance furnace, it was immediately treated at 120°C×1h in an oil bath furnace to obtain an aluminum alloy plate; and then parked at room temperature for 1 day, 2 weeks, and 1 Hardness test and tensile test were carried out after 1 month and 2 months. The simulated paint baking is carried out in an oil bath furnace at a temperature of 180°C×30min. After the paint is baked, the hardness test and tensile test are carried out.

Embodiment 3

[0038] A aluminum alloy ingot is homogenized in a circulating air resistance furnace at 550°C for 24h, then cut and face milled, hot rolled, intermittently annealed and finally cold rolled into a 1mm thick sheet. After the thin plate is quenched by solution treatment at 560°C×30min in an air circulation resistance furnace, it is immediately treated in an oil bath furnace at 150°C×20min to obtain an aluminum alloy plate; and then parked at room temperature for 1 day, 2 weeks, and 1 Hardness test and tensile test were carried out after 1 month and 2 months. The simulated paint baking is carried out in an oil bath furnace at a temperature of 180°C×30min. After the paint is baked, the hardness test and tensile test are carried out.

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Abstract

The invention belongs to the technical field of aluminium alloy plates, and specifically provides an aluminum alloy plate for automobile bodies. An aluminum alloy comprises the following components in percentage by mass: 0.5-0.8 wt. % of Si, 0.6-1.2 wt. % of Mg, 0.6-1.1 wt. % of Cu, 0.15-0.3 wt. % of Mn, and the balance being Al and trace impurities, wherein the trace impurities are composed of Fe (0.3 wt. %), Zn (0.2 wt. %), Ti (0.1 wt. %) and Cr (0.2 wt. %); and the mass ratio of Mg to Si is 1-2; and after being subjected to solution hardening treatment, the aluminum alloy is subjected to heat treatment in 20 minutes, wherein the heat treatment temperature is 100-150 DEG C, and the heat treatment time is 10 minutes-2 hours. The aluminum alloy plate (subjected to baking varnish coating) for automobile bodies is high in strength and stable in performance under the condition of thermal exposure; meanwhile, the aluminum alloy plate for automobile bodies, before being subjected to baking varnish coating, also has a good machining forming performance.

Description

technical field [0001] The invention belongs to the field of aluminum alloy plates and relates to a novel aluminum alloy plate for automobile bodies with good stamping formability and baking hardening performance. technical background [0002] Due to the key role of lightweight in energy saving and emission reduction of transportation vehicles, lightweight materials have been widely used in the automotive field in recent years. Compared with traditional steel, aluminum alloy has low density, excellent corrosion resistance and easy recycling, so the application of aluminum alloy in automobiles is increasing year by year. At present, the aluminum alloy sheets used for stamping and forming of automobile bodies are mainly three grades of aluminum alloys: AA6016, AA6022 and AA6111. These alloys are mainly formed by adding magnesium and silicon to aluminum. Copper is also added to the AA6111 alloy to increase the strength of the alloy. Another important feature is that the cont...

Claims

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Application Information

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IPC IPC(8): C22C21/08C22F1/047
Inventor 陈江华刘春辉冯佳妮伍翠兰
Owner HUNAN UNIV