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Automotive high-formability aluminum alloy material and preparation method thereof

An aluminum alloy material and formability technology, applied in the field of high formability aluminum alloy materials for automobiles and their preparation, can solve problems such as unsatisfactory stamping and forming properties, and achieve excellent paint hardening properties, excellent stamping and forming properties, small size and uniform effect

Inactive Publication Date: 2014-09-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of the prior art, the present invention aims at the unsatisfactory stamping performance of Al-Mg-Si alloys for the outer panels of automobile bodies, and develops a new type of aluminum alloy with excellent stamping performance and high paint hardening performance.

Method used

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  • Automotive high-formability aluminum alloy material and preparation method thereof
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  • Automotive high-formability aluminum alloy material and preparation method thereof

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Embodiment 1

[0038] Implement the invention alloy 1# after smelting and casting, and homogenize it. The treatment process is as follows: heat up to 540-560°C at a heating rate of 45°C / h and hold for 16 hours, and then cool down with the furnace at a cooling rate of 45°C / h Take out the sample at 100°C. After homogenization, the ingot is cut and milled, reheated to 520-555°C for hot rolling, the pass reduction is 4%-36%, the total deformation of hot rolling is >92%, and the final rolling temperature is lower than 300°C ;The hot-rolled plate is heated to 300-500°C at a heating rate of 40°C / h for 1.5h annealing treatment, cooled by air cooling, and then cold-rolled to a thickness of 1mm, and the pass reduction is at 10 ~30%, the total deformation is 50~75%; then directly cut the sample from the cold-rolled plate and place it in a heat treatment furnace at 545~555°C for 3min solution treatment, and the heating rate of the sample is greater than 200°C / min. Then the solution treated alloy sample...

Embodiment 2

[0040] After implementing the invention alloy 2#, after melting and casting, it is homogenized. The treatment process is as follows: start to heat up at a heating rate of 25°C / h, wait for the temperature to reach 450-490°C for 3 hours, and then continue to heat up to 25°C / h Insulate at 540-560°C for 16 hours, and then take out the sample when the temperature is lowered to 100°C with the furnace at a cooling rate of 25°C / h. After homogenization, the ingot is cut and milled, reheated to 520-555°C for hot rolling, the pass reduction is 4%-36%, the total deformation of hot rolling is >92%, and the final rolling temperature is lower than 300°C ;The hot-rolled plate is heated to 300-500°C at a heating rate of 40°C / h for 1.5h annealing treatment, cooled by air cooling, and then cold-rolled to a thickness of 1mm, and the pass reduction is at 10 ~30%, the total deformation is 50~75%; then directly cut the sample from the cold-rolled plate and place it in a heat treatment furnace at 545...

Embodiment 3

[0042] Implement the invention alloy 3# after smelting and casting, and homogenize it. The treatment process is as follows: start to heat up to 540-560°C at a heating rate of 45°C / h and keep it for 22 hours, and then follow the furnace at a cooling rate of 45°C / h. The sample was taken out when the temperature was lowered to 100°C. After homogenization, the ingot is cut and milled, reheated to 520-555°C for hot rolling, the pass reduction is 4%-36%, the total deformation of hot rolling is >92%, and the final rolling temperature is lower than 300°C ;The hot-rolled plate is heated to 300-500°C at a heating rate of 100°C / h for 2.5h annealing treatment, cooled by air cooling, and then cold-rolled to a thickness of 1mm, and the pass reduction is at 10 ~30%, the total deformation is 50~75%; then directly cut the sample from the cold-rolled plate and place it in a heat treatment furnace at 545~555°C for 5min solution treatment, and the heating rate of the sample is greater than 200°C / ...

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Abstract

The invention provides an automotive high-formability aluminum alloy material and a preparation method thereof. The preparation method comprises the steps of selection of novel aluminum alloy components, alloy preparation and melting-casting, homogenization, hot rolling deformation, intermediate annealing or cold rolling deformation and intermediate annealing, intermediate annealing, solution treatment, quenching and multistage pre-ageing treatment. By using the double effects that a certain quantity of multi-scale particles can be formed among different solute elements in the alloy material and then oversize particles are stimulated, re-crystallized and nucleated while fine particles block the growth of the re-crystallized grains in the high-temperature heat treatment process, so that the structure of an alloy plate is formed by the fine and uniformly distributed re-crystallized grains, the anisotropy of the alloy plate is well controlled, and the stamping forming performance is relatively excellent. Meanwhile, the novel aluminum alloy with high formability and high baking varnish hardening increment is very suitable for manufacturing of automotive body outer plates, particularly manufacturing of parts having relatively high requirements for stamping formability and baking varnish hardening increment and having complex shapes.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, and relates to a high-formability aluminum alloy material for automobiles and a preparation method thereof. It is especially developed for the special requirements of aluminum alloys for body outer panels in the automobile field on formability and anti-sag performance, which can ensure the aluminum The anisotropy of the alloy sheet is well controlled before forming, and has excellent stamping performance, and after forming, it shows excellent paint hardening characteristics in the short-time baking process. Background technique [0002] With the continuous increase in the number of vehicles, air pollution and climate conditions continue to worsen, countries around the world are increasingly aware of energy conservation and emission reduction. Therefore, how to achieve the purpose of reducing the weight of automobiles and thus energy saving and emission reduction has become a key issue for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22F1/053
Inventor 郭明星张济山庄林忠彭祥阳汪小锋张艳
Owner UNIV OF SCI & TECH BEIJING
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