Heat treatment method for synchronously improving strength and ductility of 7-series aluminum alloy plate

A technology of aluminum alloy plate and heat treatment method, applied in the field of aluminum alloy, to achieve the effect of uniform element distribution, elimination of harmful texture, and reduction of work hardening

Active Publication Date: 2019-04-16
湖南思力行科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few reports on the influence of regressive heating rate and cooling method on the microstructure and properties of regressed reaging state

Method used

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  • Heat treatment method for synchronously improving strength and ductility of 7-series aluminum alloy plate
  • Heat treatment method for synchronously improving strength and ductility of 7-series aluminum alloy plate
  • Heat treatment method for synchronously improving strength and ductility of 7-series aluminum alloy plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The alloy is hot-rolled and deformed at 460-480°C, the reduction is 95%, the alloy is heated at 470°C, and kept for 2 hours for solution treatment, and then quenched with water at room temperature at 24°C. The sample is required The transfer time is less than 5 seconds; the quenched alloy is immediately kept at 115°C for 25 hours for pre-aging treatment, and cooling in water at room temperature of 24°C requires the transfer time of the sample to be less than 5 seconds. Heat the pre-aged alloy to 160°C at a heating rate of 5°C per minute, perform reheating, and cool in water at room temperature 24°C, requiring the sample transfer time to be less than 5 seconds; put the regressed alloy at 115°C Insulate for 20 hours, carry out re-aging treatment, and finally carry out air cooling. Under the process conditions, the tensile strength of the 7050 alloy is 577MPa, the yield strength is 530MPa, and the elongation is 20%.

Embodiment 2

[0031] The alloy is hot-rolled and deformed at 460-480°C, and the reduction is 95%; the alloy is heated at 475°C and kept for 1 hour for solution treatment, and then quenched with water at room temperature at 25°C. The sample is required The transfer time is less than 5 seconds; the quenched alloy is immediately kept at 120°C for 24 hours for pre-aging treatment, and the sample transfer time is required to be less than 5 seconds for cooling in water at room temperature 25°C. Heat the pre-aged alloy to 190°C at a heating rate of 5°C per minute, perform reheating, and cool in water at room temperature 25°C. The transfer time of the sample is required to be less than 5 seconds; the regressed alloy is placed at 120°C Insulated for 28 hours, re-aged, and finally air-cooled. Under the process conditions, the tensile strength of the 7050 alloy is 588MPa, the yield strength is 558MPa, and the elongation is 23%.

Embodiment 3

[0033] The alloy is hot-rolled and deformed at 460-480°C, and the reduction is 95%; the alloy is heated at 480°C and kept for 1.5 hours for solution treatment, and then quenched in water at room temperature at 26°C. The sample is required The transfer time is less than 5 seconds; the quenched alloy is immediately kept at 120°C for 28 hours for pre-aging treatment, and the sample transfer time is required to be less than 5 seconds for cooling in water at room temperature 25°C. Heat the pre-aged alloy to 220°C at a heating rate of 5°C per minute, perform reheating, and cool in water at a room temperature of 26°C. The transfer time of the sample is required to be less than 5 seconds; the regressed alloy is placed at 120°C Insulated for 24 hours, re-aged, and finally air-cooled. Under the process conditions, the tensile strength of the 7050 alloy is 578MPa, the yield strength is 540MPa, and the elongation is 20.6%.

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Abstract

The invention relates to the technical field of aluminum alloys, in particular to a heat treatment method for synchronously improving strength and ductility of a 7-series aluminum alloy plate. According to the heat treatment method, a 7-series aluminum alloy hot-rolled plate is adopted as a treated object, solution treatment, pre-aging treatment, retrogression heating treatment and re-aging treatment are adopted in sequence, and a product is obtained. When the design process is applied to an aluminum alloy 7050 plate, the strength of extension of the obtained product ranges from 565 MPa to 590MPa, the yield strength of the obtained product ranges from 520 MPa to 560 MPa, and the ductility of the obtained product ranges from 20% to 23.5%. The strength and ductility of an alloy can be improved at the same time. In addition, the continuous temperature increase and heating manner is adopted, a large amount of time can be saved in the retrogression heating treatment stage, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to a heat treatment method for synchronously improving the strength and elongation of 7 series aluminum alloy plates. Background technique [0002] 7050 aluminum alloy is a high-strength corrosion-resistant aluminum alloy with strong compression and impact resistance and good corrosion resistance. It is mainly used in aerospace, industry, fixtures, mechanical equipment, mold processing and other fields. The 7050 alloy composition contains zinc (Zn) 5.7-6.7, copper (Cu) 2.0-2.6, magnesium (Mg) 1.9-2.6, and a small amount of zirconium, silicon and other elements, and its main strengthening phase is MgZn 2 (Metastable η' phase, equilibrium η phase). Therefore, the mechanical properties of the alloy are greatly affected by heat treatment, and it is a typical age-strengthened aluminum alloy. The foreign research is mainly to transform the strengthening phase in the 7050 alloy b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/053C21D9/46
CPCC21D9/46C22F1/053
Inventor 李国锋熊汉青吴懿萍何臻毅姚禹
Owner 湖南思力行科技有限公司
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