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A double-stage homogenization heat treatment method for ultra-high-strength aluminum alloy ingots

An aluminum alloy ingot, two-stage homogenization technology, applied in the field of heat treatment of aluminum alloy ingot, to achieve the effect of eliminating segregation and low melting point eutectic structure, improving strength and recrystallization temperature

Active Publication Date: 2016-08-24
佛山市三水凤铝铝业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a double-stage homogenization heat treatment method for ultra-high strength aluminum alloy ingots, aiming to solve how to make fine Al 3 Sc / Al 3 The Problem of Uniform Dispersion and Precipitation of Zr Particles

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  • A double-stage homogenization heat treatment method for ultra-high-strength aluminum alloy ingots
  • A double-stage homogenization heat treatment method for ultra-high-strength aluminum alloy ingots
  • A double-stage homogenization heat treatment method for ultra-high-strength aluminum alloy ingots

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Effect test

Embodiment 1

[0026] The Al-8.13Zn-2.36Cu-2.08Mg-0.21Sc-0.12Zr alloy ingot is homogenized by this two-stage homogenization heat treatment method. The specific steps are: Step A00: low-temperature pre-precipitation treatment: in a resistance heating furnace Heat the Al-8.13Zn-2.36Cu-2.08Mg-0.21Sc-0.12Zr alloy ingot from room temperature to 315°C for low-temperature pre-precipitation treatment, holding time 6h;

[0027] Step B00: high temperature and long-term homogenization treatment: the Al-8.13Zn-2.36Cu-2.08Mg-0.21Sc-0.12Zr alloy ingot treated in step A00 is subjected to high temperature and long-term treatment in a resistance heating furnace, and the heating temperature is 465°C , holding time 24h, followed by air cooling.

[0028] The Al-8.13Zn-2.36Cu-2.08Mg-0.21Sc-0.12Zr alloy ingot treated by the above process was treated with the Al-8.13 Zn-2.36Cu-2.08Mg-0.21Sc-0.12Zr alloy ingot comparison can be seen, the Al-8.13Zn-2.36Cu-2.08Mg-0.21Sc-0.12Zr alloy ingot after the double-stage homo...

Embodiment 2

[0030] The Al-8.13Zn-2.36Cu-2.08Mg-0.21Sc-0.12Zr alloy ingot is homogenized by this two-stage homogenization heat treatment method. The specific steps are: Step A00: low-temperature pre-precipitation treatment: in a resistance heating furnace Heat the Al-8.13Zn-2.36Cu-2.08Mg-0.21Sc-0.12Zr alloy ingot from room temperature to 325°C for low-temperature pre-precipitation treatment, holding time 4h;

[0031] Step B00: high temperature and long-term homogenization treatment: the Al-8.13Zn-2.36Cu-2.08Mg-0.21Sc-0.12Zr alloy ingot treated in step A00 is subjected to high temperature and long-term treatment in a resistance heating furnace, and the heating temperature is 465°C , holding time 24h, followed by air cooling.

[0032] The Al-8.13Zn-2.36Cu-2.08Mg-0.21Sc-0.12Zr alloy ingot treated by the above process was treated with the Al-8.13 Zn-2.36Cu-2.08Mg-0.21Sc-0.12Zr alloy ingot comparison can be seen, the Al-8.13Zn-2.36Cu-2.08Mg-0.21Sc-0.12Zr alloy ingot after the double-stage homo...

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Abstract

The invention discloses a double-stage homogenization heat treatment method for an ultra-high-strength aluminum alloy ingot. The ingot alloy composition mass percentage is: Zn: 8.13, Cu: 2.36, Mg: 2.08, Sc: 0.21, Zr: 0.12, Fe ≤0.07, Si≤0.09, a single other element ≤0.05, the sum of other elements ≤0.15, and the balance is Al; including the following steps: heating the ingot to 315-325°C in a resistance heating furnace for low-temperature pre-precipitation treatment, heat preservation The time is 4-6h; the ingot is processed in the furnace at high temperature for a long time, the heating temperature is 462-467°C, the holding time is 23-25h, and air-cooled. On the basis of eliminating the segregation and eutectic structure of the main alloy elements in the alloy ingot, the present invention effectively regulates the Al content in the alloy ingot. 3 Sc / Al 3 The size and distribution of Zr precipitates can greatly improve the strength and recrystallization temperature of the alloy.

Description

technical field [0001] The invention relates to a heat treatment method for an aluminum alloy ingot, in particular to a two-stage homogenization heat treatment method for an ultra-high-strength aluminum alloy ingot. Background technique [0002] Due to the high alloying degree of ultra-high strength Al-Zn-Cu-Mg-Sc-Zr alloy, dendrite segregation exists in the solidification process, coarse eutectic structure exists in the grain boundary, and the chemical composition and structure distribution in the grain and grain boundary are different. Uniformity, deterioration of hot processing performance, reduction of strength and plasticity of processed products, and increase of stress corrosion sensitivity. In order to eliminate the damage caused by the ingot structure to the processing performance and the final use performance of the processed product, homogenization heat treatment must be carried out before hot deformation of the ultra-high-strength aluminum alloy ingot to eliminate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/053C22C21/10
Inventor 黄志其潘清林刘志铭胡权史运嘉尹志民
Owner 佛山市三水凤铝铝业有限公司