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A Treatment Method for Significantly Improving the Deformability and Mechanical Properties of High-Strength Aluminum Alloys

A treatment method and aluminum alloy technology, which is applied in the fields of metal material processing and aluminum alloy processing, can solve the problems of poor deformation ability of AZ31 magnesium alloy, long difference in practical application, and small size of rolled blanks, etc. Inhibition of dynamic recovery or recrystallization and improvement of mechanical properties

Active Publication Date: 2015-10-07
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, patents such as EP 2546373, CN 102051564, CN 102127725, and CN 102816910 use liquid nitrogen cryogenic rolling to optimize the properties of Al-Mg alloys, copper alloys, AZ31 magnesium alloys, and the cold-rolled texture of NiFe alloys, etc., such as Al-Mg series alloys, copper alloys, and NiFe alloys are easier to achieve cold deformation processing, so the main purpose of liquid nitrogen cryogenic rolling is to achieve microstructure optimization and improve performance; AZ31 magnesium alloy itself has poor deformation ability, and its plates basically use medium temperature It is prepared by hot rolling, and in the patent CN 102127725, only 5-8% liquid nitrogen cryogenic rolling deformation is implemented for AZ31 magnesium alloy, which does not greatly improve its deformation ability
Research progress in recent years also shows that rolling deformation based on ultra-low temperature cooling of blanks can obtain high-performance pure metals and alloys with ultra-fine grains / nanostructures, but they are still in the laboratory research stage, and the size of the rolled blanks obtained is also Both are small, and the relevant research is far from practical application

Method used

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  • A Treatment Method for Significantly Improving the Deformability and Mechanical Properties of High-Strength Aluminum Alloys
  • A Treatment Method for Significantly Improving the Deformability and Mechanical Properties of High-Strength Aluminum Alloys
  • A Treatment Method for Significantly Improving the Deformability and Mechanical Properties of High-Strength Aluminum Alloys

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The industrially produced AA 7050 high-strength aluminum alloy hot-rolled plate is used as the rolling raw material, at 475 o C. After solution treatment for 2 hours, water quenching, the solid solution state AA7050 alloy sheet is milled into pre-rolled sheets with a thickness of 15 mm and 20 mm and smooth upper and lower surfaces. The 15 mm and 20 mm thick AA 7050 alloy sheets were cold-rolled and deformed at room temperature with a deformation of 10% per pass. The interval between each pass is 10-15 minutes or one pass of cold rolling is directly immersed in the next pass of rolling, that is, continuous cold rolling. The results show that the 15 mm thick AA 7050 alloy sheet undergoes serious cracking or cracking after 53% deformation of cold rolling at intervals of 10-15 minutes per pass, and larger cracking occurs after continuous cold rolling of 63%. The 20 mm thick solid solution state AA 7050 alloy plate was rolled at intervals at room temperature with the same p...

Embodiment 2

[0035] The industrially produced AA 7050 high-strength aluminum alloy hot-rolled plate is used as the rolling raw material, at 475 o After C solution treatment for 2 hours, water quenching, the solution quenched state AA 7050 alloy plate is then heated at 350 o C heat preservation treatment for 1 hour, out of the furnace and water quenching. The state alloy plate was milled into a pre-rolled plate with a thickness of 20 mm and smooth upper and lower surfaces. The milled 20 mm thick AA 7050 high-strength aluminum alloy plate was immersed in liquid nitrogen to cool for more than 2 hours, and then the 20 mm thick plate was rolled in multiple passes with a pass reduction of 10%, and the total deformation was 66% . Before rolling each pass, the alloy plate is immersed in liquid nitrogen for cooling for 15-20 minutes. It was found that after 350 o After C-1 h treatment, the 20 mm thick AA 7050 high-strength aluminum alloy plate did not appear cracking or edge cracking after roll...

Embodiment 3

[0037] The industrially produced AA 7050 high-strength aluminum alloy hot-rolled plate is used as the rolling raw material, at 475 o After C solution treatment for 2 hours, water quenching, the solution quenched state AA 7050 alloy plate was then heated at 200 o C heat preservation treatment for 10 hours, and water quenching after taking out of the furnace. The state alloy plate was milled into a pre-rolled plate with a thickness of 15 mm and smooth upper and lower surfaces. The milled 15 mm thick AA 7050 high-strength aluminum alloy plate was immersed in liquid nitrogen to cool for more than 2 hours, and then the 15 mm thick plate was rolled in multiple passes with a pass reduction of 10%, and the total deformation was 74% . The alloy plates were immersed in liquid nitrogen for 20 minutes before each rolling pass. At the same time, the same reduction is used for multi-pass room temperature interval rolling, and the deformation is 70%. It was found that after 200 o After ...

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Abstract

The invention relates to a treatment method for obviously improving the deformability and the mechanical property of a high-strength aluminum alloy. The method comprises the following steps of: sequentially performing a solid solution treatment and a quenching or annealing treatment on a sheet material; performing low-temperature pre-cooling and rolling deformation on the sheet material; and recrystallizing and aging the sheet material, wherein in the low-temperature pre-cooling process, the low-temperature or ultralow-temperature cooling treatment is performed on the sheet material in a cooling medium with the temperature of 196 to -50 DEG C so that the temperature of the sheet material is equivalent to that of the cooling medium; and in the rolling process, the pre-cooling treatment can be firstly performed on a milling roller, wherein the reduction in pass can reach 5% to 30% and the total deformation can reach more than 90%. Compared with the conventional treatment process, the treatment method provided by the invention has the advantages that the temperature and the time of the recrystallization treatment and the aging treatment of the machined alloy sheet material are decreased and shortened obviously; and the rolling deformability and the strength of the high-strength aluminum alloy and other types of aluminum alloys are improved obviously. In addition, a two-high mill or a four-high mill for the existing industrial production can be applied to the alloy-machining treatment method provided by the invention, so that the alloy property is improved while the cost is lowered obviously. Therefore, the method provided by the invention has a great potential in industrial application.

Description

technical field [0001] The invention discloses a treatment method for significantly improving the deformability and mechanical properties of aluminum alloys, especially capable of significantly improving the rolling deformability and tensile strength of ultra-high-strength aluminum alloys, and belongs to the field of metal material processing, especially the field of aluminum alloy processing. Background technique [0002] The industrial production of aluminum alloy plates generally adopts the process of DC casting-hot rolling-cold rolling, combined with intermediate annealing or furnace heating treatment to ensure the smooth progress of hot rolling and cold rolling, without cracking and cracking of the rolled plate during the rolling process. Edge cracking and other phenomena, and hot and cold rolling are important steps to improve the structure and properties of deformed aluminum alloys. For example, Chinese patents CN 101614317, CN 101967615, CN 102828131, CN 101712116, e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/04
Inventor 侯陇刚刘明荔史金涛崔华张济山庄林忠
Owner UNIV OF SCI & TECH BEIJING
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