6XXX aluminum alloy suitable for automobile body and preparation process of automobile body plate

A technology for automobile bodies and aluminum alloys, which is applied in the preparation process of 6XXX aluminum alloys and body panels, and in the field of 6XXX series aluminum alloys, which can solve the problems of the safety performance of the body panels, the impact of dent resistance, and low strength, and achieve a reasonable microstructure , improve the elongation rate, and ensure the rationality of the effect

Active Publication Date: 2018-12-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Patent CN 104451208 A discloses an alloy containing 0.5% to 1.5% of silicon, 0.25% to 0.6% of magnesium, less than 0.3% of iron and less than 0.2% of manganese in mass percent, and also discloses an aluminum alloy Body panel processing technology, using patented panels and heat-treated panels have good surface properties and stable mechanical properties, but the yield strength after baking paint aging is about 180MPa, and the strength is low
[0008] The above-mentioned patents hope to provide an aluminum alloy plate suitable for the body. The elongation of the alloy can reach 24% at room temperature when it is parked, which can meet the subsequent processing of the plate; Performance and dent resistance have certain influence

Method used

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  • 6XXX aluminum alloy suitable for automobile body and preparation process of automobile body plate
  • 6XXX aluminum alloy suitable for automobile body and preparation process of automobile body plate
  • 6XXX aluminum alloy suitable for automobile body and preparation process of automobile body plate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] The composition is 1.15% magnesium, 0.88% silicon, 0.5% manganese, 0.5% copper, 0.2% iron, and the rest is Al and unavoidable impurities. After the aluminum alloy ingot is homogenized by the above process, hot rolled and cold rolled To obtain a plate with a thickness of 1mm, heat the aluminum alloy plate at 545°C for 35 minutes, and conduct a tensile test immediately after water cooling and quenching; the other group simulates the aging of the paint within 30 to 60 seconds after water cooling and quenching, and heats it at about 185°C for 30 to 35 minutes Then the stretching test was carried out.

[0077] Table 1 Example 1 Tensile test before and after baking paint

[0078]

Embodiment 2

[0080]The composition is 1.15% magnesium, 0.88% silicon, 0.5% manganese, 0.5% copper, 0.2% iron, and the rest is Al and unavoidable impurities. After the aluminum alloy ingot is homogenized by the above process, hot rolling and cold rolling To obtain a plate with a thickness of 1mm, heat the aluminum alloy plate at 545°C for 35 minutes, and then place it naturally for 15 days after water cooling and quenching to simulate the aging of the paint.

[0081] Table 2 Example 2 Tensile test before and after baking paint

[0082]

Embodiment 3

[0084] The composition is 1.15% magnesium, 0.88% silicon, 0.5% manganese, 0.5% copper, 0.2% iron, and the rest is Al and unavoidable impurities. After the alloy casting is completed, the aluminum alloy ingot is passed through the process described in the article After homogenization, hot rolling and cold rolling, a plate with a thickness of 1mm is obtained. The aluminum alloy plate is kept at 545°C for 35 minutes. Microhardness test, the results are shown in Table 3, and the solid solution state of the plate and the microstructure of the secondary artificial aging sample are observed, see Figures 3-7.

[0085] Table 3 Microhardness under secondary artificial aging state

[0086]

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Abstract

The invention relates a 6XXX aluminum alloy suitable for an automobile body and a preparation process of an automobile body plate. The 6XXX aluminum alloy comprises the following components including,by mass, 0.9%-1.3% of magnesium, 0.70%-1.0% of silicon, 0.45%-0.6% of manganese, 0.15%-0.3% of iron, 0.45%-0.55% of copper and the balance Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.06%. The preparation process comprises the following steps of melt casting, homogenizing heat treatment, rolling, solution heat treatment, pre-aging heat treatment, natural aging treatment and secondary artificial aging heat treatment. By means of the alloy and the preparation process, by optimizing the alloy composition, the preparation process and the heat treatment method, the strength of the plate after standing at room temperature is reduced, and meanwhile it is guaranteed that the strength of the plate after painting aging is greatly increased. According to the process scheme, melt casting, homogenization and hot and cold rolling are carried out to obtain an alloy plate; and after the plate is subjected to solution treatment, preageing is carried out, and a finished aluminum alloy plate which can be used as an automobile body plate material is obtained. By means of the technical scheme, the aluminum alloy plate which is low in cost, high in quality, capable of achieving room temperature storage and transportation and good in forming property is obtained. After artificial aging is carried out on the plate obtained after deformation treatment, the strength and plasticity are both high.

Description

technical field [0001] The invention relates to a 6XXX series aluminum alloy, in particular to a 6XXX aluminum alloy suitable for automobile bodies and a preparation process for a body plate, belonging to the technical field of non-ferrous metals. Background technique [0002] In recent years, with the rapid development of the domestic high-speed transportation industry, the problem of automobile pollution has become increasingly serious. Realizing automobile lightweight to reduce the pollution of traditional fuel vehicles is the way for the future survival and development of the automobile industry. Therefore, the development of semi-aluminum or all-aluminum structure vehicles and new hybrid structure vehicles is the main trend now, and the 6XXX series aluminum alloy is the only aluminum alloy that has no stress cracking phenomenon among the aluminum alloys that can be heat-treated and strengthened. It has good formability, medium strength, high corrosion resistance and low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C22C1/03C22C21/08C22F1/047
CPCC21D9/0075C21D9/0081C22C1/026C22C1/03C22C21/08C22F1/002C22F1/047
Inventor 李凯鲁强杜勇
Owner CENT SOUTH UNIV
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