Car body aluminum alloy plate and manufacturing method thereof

A technology for aluminum alloy sheets and automobile body panels, which is applied in the field of aluminum alloys, can solve problems that are difficult to achieve, have general comprehensive performance, and do not involve the development of new alloys, and achieve excellent processing and forming performance and increased strength.

Inactive Publication Date: 2013-06-26
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, some domestic colleges and universities and scientific research institutes, such as Central South University, Northeastern University, Zhengzhou University and Suzhou Institute of Nonferrous Metals, etc., have studied the composition design, aging precipitation behavior, sheet formability and Some studies have also been carried out on bake hardening properties, but most of the research on composition design is mainly focused on the adjustment and optimization of Mg and Si content, as well as the addition of microalloying elements (such as rare earth elements, etc.). The introduction of new strengthening phase-forming elements does not involve the development of new alloys that can be applied to low-temperature baking paint processes. Overall, the comprehensive performance of the prepared 6xxx series aluminum alloy automotive sheets is average, and low alloying is generally used to sacrifice part of the strength. Obtain high formability, or obtain high strength by sacrificing formability, it is difficult to achieve a good match between formability before baking and high strength after bake hardening

Method used

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Effect test

preparation example Construction

[0010] The raw materials of aluminum alloy plates are 99.9% high-purity aluminum, industrial pure Mg, industrial pure Zn, master alloys Al-20%Si, Al-50%Cu, Al-20%Fe, Al-10%Mn, Al- 5%Cr. The preparation method of the aluminum alloy plate comprises the steps of smelting and casting, homogenization, hot rolling, cold rolling, intermediate annealing, cold finish rolling, water quenching, and T4 or T4P treatment. The smelting steps in the resistance furnace include:

[0011] 1) First, put 10Kg of pure aluminum into the crucible except about 200g for spare, set the furnace temperature at 850°C, add Al-20%Si, Al-50%Cu, Al- 20%Fe, Al-10%Mn master alloy, and add a small amount of covering agent, the covering agent is about 50g of NaCl and KCl (mass ratio is 1:1);

[0012] 2) Continue to heat the melt until the intermediate alloy is melted. Stir it after the melt reaches 750°C to mix the solute elements evenly. After the temperature drops to 710°C, add pure Zn and pure Mg, and fully ...

Embodiment 1

[0027] Samples are taken from the cold-rolled thin plate after implementing the invention alloy 1# through smelting and casting→homogenization→hot rolling→cold rolling→intermediate annealing→cold finish rolling, and the samples are subjected to solution treatment at 555°C / 2min in a salt bath furnace, and then After 14 days at room temperature, the mechanical properties of the T4 state and the corresponding baking state were tested, and the baking process was 185°C / 20min.

Embodiment 2

[0029] Samples are taken from the cold-rolled thin plate after implementing the invention alloy 2# through smelting and casting→homogenization→hot rolling→cold rolling→intermediate annealing→cold finishing rolling, and the samples are carried out in a salt bath furnace for solution treatment at 555°C / 2min, and then After 14 days at room temperature, the mechanical properties of the T4 state and the corresponding baking state were tested, and the baking process was 185°C / 20min.

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PUM

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Abstract

The invention provides a high-strength brake hardening car body aluminum alloy plate and a manufacturing method thereof, and belongs to the technical field of aluminum alloy. The aluminum alloy has the component characteristic that a Zn element is added on the basis of the conventional AL-Mg-Si-Cu quaternary alloy, so that the alloy has higher brake hardening performance; and interaction, strengthening-phase separation process and the like among solute elements are reasonably adjusted through reasonable pre-ageing process optimization control, and therefore, a novel car material Al-Mg-Si-Cu-Zn quinary aluminum alloy with excellent comprehensive performances is successfully developed. By adding the element Zn, the aluminum alloy material disclosed by the invention has the performance characteristic of being low in yield strength, good in plasticity and conductive to stamping and forming a car covering piece before baking finish; and after baking finish is finished, the yield strength is greatly improved, the tensile strength is high and the bake hardening performances are high.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, and in particular relates to an aluminum alloy plate for automobile bodies that can be applied to low-temperature baking paint and has high baking hardening and a preparation method thereof. Background technique [0002] Contemporary automobiles are developing in the direction of light weight, high speed, safety, comfort, low cost, low emission and energy saving. Energy saving, safety, and environmental protection are the three major themes of automobile modernization. With the continuous increase of the number of cars in the world, fuel consumption and waste pollution are also increasing, which prompts the automobile industry to focus on energy and environmental protection for sustainable development. The development of new energy technology is not yet mature, and the weight reduction of automobiles is undoubtedly The best way to reduce energy consumption and pollution, and advanced auto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C1/03C22F1/04
Inventor 张济山游江海代陈绪曹零勇郭明星庄林忠
Owner UNIV OF SCI & TECH BEIJING
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