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Aluminum alloy plate exhibiting excellent baking finish hardening properties

An aluminum alloy plate and hardening technology, applied in the field of Al-Mg-Si series aluminum alloy plate, can solve the problems of reduced BH property, inability to increase the strength of yield strength, insufficient control of atomic aggregates, etc., and achieve high BH property. Effect

Inactive Publication Date: 2015-05-20
KOBE STEEL LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Especially in the case of the outer panel, which is subject to severe bending, even if it can be formed without problems immediately after manufacture, after age hardening (room temperature aging), problems such as cracks may occur during hemming
[0008] In addition, there is also a problem that if such aging at room temperature is large, the BH property will be reduced, and the yield strength will not be able to reach even by heating during artificial aging (hardening) treatment such as coating and baking treatment of the formed panel. Increased to the strength required as a panel
That is, these prior art techniques cannot evaluate the aggregates of atoms in detail, so the compact control of the aggregates of atoms is insufficient

Method used

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  • Aluminum alloy plate exhibiting excellent baking finish hardening properties
  • Aluminum alloy plate exhibiting excellent baking finish hardening properties
  • Aluminum alloy plate exhibiting excellent baking finish hardening properties

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Embodiment

[0123] Next, examples of the present invention will be described. According to the time from the solution and quenching treatment to the start of reheating treatment, and the processing rate from the solution and quenching treatment to the start of reheating skin pass rolling, the composition and cluster conditions specified in the present invention are prepared respectively. Different 6000 series aluminum alloy plates. Then, the BH properties (coating bake hardening properties) of these respective examples after being kept at room temperature for 100 days were evaluated. Hemming workability as bending workability was also evaluated together.

[0124] In the display of the content of each element in Table 1 showing the composition of the 6000-series aluminum alloy plate of each example, the numerical value of each element is displayed as a blank, indicating that the content is below the detection limit.

[0125] The specific production conditions of the aluminum alloy plate ...

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Abstract

The BH properties of a specific 6000-series aluminum alloy plate after aging at room temperature is further improved by including a predetermined density or greater of a specific cluster having a large effect on BH properties, and by controlling the proportion of clusters having a large Mg atom number, as measured by means of a 3D atom probe field ion microscope, to be greater than other clusters of atoms satisfying prescribed conditions. Provided is a 6000-series aluminum alloy plate exhibiting excellent BH properties and molding properties after aging at room temperature.

Description

technical field [0001] The present invention relates to an Al-Mg-Si based aluminum alloy plate. The aluminum alloy sheet referred to in the present invention is a rolled sheet such as a hot-rolled sheet or a cold-rolled sheet, and refers to a sheet that has been subjected to quenching and tempering such as solution treatment and quenching treatment, and before artificial aging treatment such as baking coating hardening treatment. aluminum alloy plate. In addition, in the following description, aluminum is also called Al. Background technique [0002] In recent years, social demands for weight reduction of vehicles such as automobiles have been increasing from the viewpoint of consideration of the global environment and the like. In order to meet this demand, as a material for automobile panels, especially large body panels (outer panels, inner panels) such as hoods, doors, and roofs, in addition to steel materials such as steel sheets, formability, bake-coating hardenabili...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C21/06C22F1/05C22F1/00
CPCC22C21/02C22C21/06C22F1/05
Inventor 宍户久郎松本克史有贺康博
Owner KOBE STEEL LTD
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