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Hot working method for improving strength of wrought aluminium alloy and keeping plasticity of wrought aluminium alloy

A technology for deforming aluminum alloys and aluminum alloys, which is applied in the fields of metal and alloy preparation and heat treatment, can solve problems such as industrial production of difficult high-performance aluminum alloys, threats to fatigue life and service safety, and high requirements for equipment performance, achieving long residence time, Save energy and equipment investment, the effect of stable product quality

Active Publication Date: 2013-04-17
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the strength of alloys prepared by these large plastic deformation methods is improved due to the refinement of grains, compared with traditional T6 and T5 treatments, their plasticity is greatly reduced or even has no obvious room temperature plasticity.
In addition, when the aluminum alloy is prepared by the large plastic deformation method, defects such as micropores will be introduced due to local strain instability, and these defects pose a great threat to its fatigue life and service safety.
More importantly, the above-mentioned large plastic deformation method can only prepare small samples, it is difficult to carry out large-scale production, and the manufacturing method is complicated, which requires high equipment performance
Because of the above factors, the large plastic deformation method is still difficult to be used in the industrial production of high-performance aluminum alloys.

Method used

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  • Hot working method for improving strength of wrought aluminium alloy and keeping plasticity of wrought aluminium alloy
  • Hot working method for improving strength of wrought aluminium alloy and keeping plasticity of wrought aluminium alloy
  • Hot working method for improving strength of wrought aluminium alloy and keeping plasticity of wrought aluminium alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0048] AA6061 aluminum alloy ingots were homogenized in a circulating air resistance furnace at 550 °C for 24 hours, then cut and milled, hot-rolled into a 5 mm thick plate, and then solid solution treated and watered at 560 °C for 30 min in an air circulating resistance furnace. Quenching. Then the plate is parked at room temperature (for example, 20°C-25°C) for 30 minutes, and then cold-rolled into a thin plate with a thickness of 1 mm after multiple passes. Then the plate is subjected to aging treatment at 70°C, 120°C, 150°C and 180°C for different times in an oil bath furnace, and the peak aging time of each alloy is found through hardness testing, and the time to reach the peak value is 120h, 12h, 1h and 30min respectively , and then perform tensile tests on the peak-aged aluminum alloy. The artificial aging was carried out in an oil bath furnace with a temperature control accuracy of ±2°C.

Embodiment 2

[0050] AA6061 aluminum alloy ingots were homogenized in a circulating air resistance furnace at 550 °C for 24 hours, then cut and milled, hot-rolled into a 5 mm thick plate, and then solid solution treated and watered at 560 °C for 30 min in an air circulating resistance furnace. Quenching. Then the plate is parked at room temperature (for example, 20°C-25°C) for 1 day, and then cold-rolled into a thin plate with a thickness of 1 mm after multiple passes. Then, the plate is subjected to aging treatment at different times of 70°C, 120°C, 150°C and 180°C in an oil bath furnace, and the peak aging time of each alloy is found through hardness testing. The time to reach the peak value is 120h, 12h, 1h and 10min respectively. ,, and then perform tensile tests on the peak-aged aluminum alloy. The artificial aging was carried out in an oil bath furnace with a temperature control accuracy of ±2°C.

Embodiment 3

[0052] AA6061 aluminum alloy ingots were homogenized in a circulating air resistance furnace at 550 °C for 24 hours, then cut and milled, hot-rolled into a 5 mm thick plate, and then solid solution treated and watered at 560 °C for 30 min in an air circulating resistance furnace. Quenching. Then the plate is parked at room temperature (for example, 20°C-25°C) for 2 weeks, and finally cold-rolled into a 1mm thick sheet through multiple passes. Then, the plate is subjected to aging treatment at 70°C, 120°C, 150°C and 180°C for different times in an oil bath furnace, and the peak aging time of each alloy is found through hardness testing, and the time to reach the peak value is 120h, 10h, 1h and 10min respectively Then, the tensile test was carried out on the aluminum alloy in the peak aging state, and the aging treatment time at 120°C was 8h, and that at 150°C was 1h. The artificial aging was carried out in an oil bath furnace with a temperature control accuracy of ±2°C.

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Abstract

The invention belongs to the technical field of metal and alloy fabricating and heat treatment, and provides a hot working method for improving strength of a wrought aluminium alloy and keeping plasticity of the wrought aluminium alloy. The method comprises the steps that the aluminium alloy is cast to form a cast ingot; the cast ingot is subjected to homogenization treatment and heat deformation treatment to form a plate; and the plate is sequentially subjected to solid solution and quenching treatment, natural aging treatment, cold deformation treatment and artificial aging treatment. The method can be used for large-scale production of high-strength aluminium alloys; and compared with the existing hot working method, the manufacturing cost is not increased.

Description

technical field [0001] The invention belongs to the technical field of preparation and heat treatment of metals and alloys, and relates to a high-efficiency and low-cost novel thermal processing method for improving the strength of a deformed aluminum alloy and keeping its plasticity basically unchanged. Background technique [0002] With the increasingly high requirements for weight reduction in modern vehicles, the application of aluminum alloy as an important structural material in the fields of automobile, high-speed rail and aviation industry is gradually increasing. The high-end aluminum alloy materials currently used in vehicles, such as extruded profiles, plates and forgings, are basically deformed aluminum alloys, including 6×××, 2××× and 7××× alloys. After casting, these aluminum alloys will be subjected to homogenization of the ingot at a certain temperature, and then undergo hot deformation and cold deformation. After deformation, the factory will perform soluti...

Claims

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Application Information

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IPC IPC(8): C22F1/04
Inventor 陈江华刘春辉李祥亮王时豪伍翠兰
Owner HUNAN UNIV
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