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Homogenization heat treatment method of Al-Zn-Mg-Cu-Zr aluminum alloy

A technology for homogenizing heat treatment of aluminum alloys, applied in the field of homogenizing heat treatment of Al-Zn-Mg-Cu-Zr aluminum alloys, can solve problems such as inapplicability, improve thermal efficiency, avoid microstructure over-burning, and solve coarse The effect of phase back dissolution

Active Publication Date: 2016-06-29
CHINALCO MATERIALS APPL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the characteristics of the melting temperature rise of aluminum alloy under high pressure, a higher temperature is used for homogenization heat treatment, but this method is not suitable for the existing equipment production lines of aluminum processing enterprises

Method used

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  • Homogenization heat treatment method of Al-Zn-Mg-Cu-Zr aluminum alloy
  • Homogenization heat treatment method of Al-Zn-Mg-Cu-Zr aluminum alloy
  • Homogenization heat treatment method of Al-Zn-Mg-Cu-Zr aluminum alloy

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Experimental program
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Effect test

Embodiment 1

[0029] The composition of aluminum alloy is calculated by mass percentage: Zn6.24wt.%, Mg2.06wt.%, Cu2.09wt.%, Ti<0.06wt.%, Zr0.1wt.%, Fe≤0.08wt.%, Si≤0.03 wt.%, the balance is Al. Semi-continuous casting into 450mm thick specification ingots.

[0030] The alloy adopts the three-stage homogenization heat treatment system of the method of the present invention to carry out homogenization treatment. The specific process is: from room temperature to 400° C. for 10 hours at an average heating rate of 55° C. / h (heating time 6.8 hours), and then continue to heat at 10° C. The average heating rate of ℃ / h (heating time 7h) was raised to 470°C for 3h, and then the average heating rate of 2.5°C / h (heating time 4h) was raised to 480°C for 12h, 18h, 21h and 24h.

Embodiment 2

[0032] The composition of aluminum alloy is calculated by mass percentage: Zn6.42wt.%, Mg2.08wt.%, Cu2.13wt.%, Mn<0.10wt.%, Ti<0.06wt.%, Zr0.1wt.%, Fe≤0.08 wt.%, Si≤0.03wt.%, the balance is Al. Semi-continuous casting into ingots with a thickness of 520 mm.

[0033] The alloy adopts the three-stage homogenization heat treatment system of the method of the present invention to carry out homogenization treatment. The specific process is: from room temperature to 400° C. for 10 hours at an average heating rate of 55° C. / h (heating time 6.8 hours), and then continue to heat at 10° C. The average heating rate of ℃ / h (heating time 7h) was raised to 470°C for 3h, and then the average heating rate of 2.5°C / h (heating time 4h) was raised to 480°C for 12h, 24h and 48h.

Embodiment 3

[0035] The composition of aluminum alloy is calculated by mass percentage: Zn6.39wt.%, Mg2.09wt.%, Cu2.17wt.%, Ti<0.06wt.%, Zr0.1wt.%, Fe≤0.08wt.%, Si≤0.03 wt.%, the balance is Al. Semi-continuous casting into 600mm thick specification ingots.

[0036] The alloy adopts the three-stage homogenization heat treatment system of the method of the present invention to carry out homogenization treatment. The specific process is: from room temperature to 400° C. for 10 hours at an average heating rate of 55° C. / h (heating time 6.8 hours), and then continue to heat at 10° C. The average heating rate of ℃ / h (heating time 7h) was raised to 470°C for 3h, and then the average heating rate of 2.5°C / h (heating time 4h) was raised to 480°C for 24h, 36h and 48h.

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Abstract

The invention relates to a homogenization heat treatment method of Al-Zn-Mg-Cu-Zr aluminum alloy. The homogenization heat treatment method of the Al-Zn-Mg-Cu-Zr aluminum alloy is characterized in that a three-level homogenization heat treatment process for controlling a heating process is used for homogenization heat treatment, and the homogenization heat treatment method comprises the following steps: (1) carrying out low-temperature pre-precipitation, and carrying out a first-level homogenization heat treatment process for promoting precipitation of Al3Zr as a dispersed phase; (2) insulating, and carrying out a second-level homogenization heat treatment process for increasing the overburnt temperature of a structure; and (3) carrying out a long-term uniform insulating process, and carrying out a third-level homogenization heat treatment process for eliminating high-melting-point Al2CuMg. By the heat treatment process, the problem of insufficient soaking in large cast ingots of 7xxx series aluminum alloy can be solved well, a coarse phase does not dissolve in a microscopic structure, an S phase is fully re-dissolved, and meanwhile, uniform precipitation of Al3Zr as the dispersed phase can be regulated and controlled. More importantly, the homogenization heat treatment method is suitable for industrial production of large cast ingots, and has good operability; meanwhile, homogenization heat treatment time can be shortened; and energy consumption of heat treatment is reduced.

Description

technical field [0001] A homogenization heat treatment method for Al-Zn-Mg-Cu-Zr aluminum alloy, in particular to a three-stage homogenization heat treatment method for Al-Zn-Mg-Cu-Zr aluminum alloy with controlled temperature rise process. Background technique [0002] Al-Zn-Mg-Cu ultra-high-strength aluminum alloys have the advantages of high specific strength and hardness, good processability, good corrosion resistance and high toughness, and are widely used in the aerospace field. In recent years, in order to reduce costs, integral structural parts are often used in the aviation industry to replace assemblies composed of a large number of die forgings or extrusions. This broadens the market for the application of aluminum alloy thick plates in the aviation industry, and at the same time puts forward higher requirements for the production technology level of large-scale aluminum alloy ingots. Due to the high alloying degree of Al-Zn-Mg-Cu aluminum alloy, the dendrite seg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/053
CPCC22F1/053
Inventor 肖翔刘成赵健罗海云
Owner CHINALCO MATERIALS APPL RES INST CO LTD
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