Thermomechanical treatment method of 6000-series aluminum alloy

A technology of deformation heat treatment and aluminum alloy, which is applied in the field of deformation heat treatment of aluminum alloy to achieve the effect of eliminating the sensitivity of intergranular corrosion

Inactive Publication Date: 2013-09-18
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this tissue characteristic is difficult to obtain only by aging treatment

Method used

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  • Thermomechanical treatment method of 6000-series aluminum alloy
  • Thermomechanical treatment method of 6000-series aluminum alloy
  • Thermomechanical treatment method of 6000-series aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 6061 aluminum alloy hot-rolled plate, after 540℃ / 1h solution treatment and water quenching, firstly carry out 180℃ / 2h pre-aging, then carry out room temperature cold rolling deformation with a reduction of 75%, and finally carry out 175℃ / 6h aging. At this time, the tensile properties and corrosion types of the alloy are shown in Table 1, and the corrosion morphology is shown in Table 1. figure 2 b, TEM structure of the grain boundary region see image 3 b, tensile fracture morphology see Figure 4 b.

[0024] figure 2 Corrosion morphology of 6061 aluminum alloy under the conventional 540°C / 1h solution treatment, water quenching and T6 (180°C / 6h) aging treatment and 180°C / 2h+75% cold rolling deformation+175°C / 6h . figure 2 a shows that the T6 state 6061 aluminum alloy grains are separated from each other, showing a serious tendency of intergranular corrosion. And through 540 ℃ / 1h solution treatment of the present invention, water quenching and 180 ℃ / 2h+75% cold ...

Embodiment 2

[0028] 6061 aluminum alloy hot-rolled sheet, after solution treatment at 530°C / 1h and air cooling, firstly carry out 150°C / 24h pre-aging, then carry out cold rolling deformation at room temperature with a reduction of 80%, and finally carry out 160°C / 12h aging. At this time, the tensile properties and corrosion types of the alloy are shown in Table 1.

Embodiment 3

[0030] 6061 aluminum alloy hot-rolled sheet, after solution treatment at 530°C / 4h and water quenching, firstly carry out 190°C / 1h pre-aging, then carry out cold rolling deformation at room temperature with a reduction of 60%, and finally carry out 170°C / 10h Re-aging. At this time, the tensile properties and corrosion types of the alloy are shown in Table 1.

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Abstract

The invention belongs to the technical field of an aluminum alloy thermomechanical treatment, which is particularly suitable for a 6000-series aluminum alloy. The invention provides a thermomechanical treatment method of a 6000-series aluminum alloy, aiming at the defect that in the prior art, the peak value aging state (T6) of the 6000-series aluminum alloy is high in strength and the intercrystalline corrosion is severe, so that not only the intensity of the 6000-series aluminum alloy can be improved greatly, but also the intercrystalline corrosion sensitivity is eliminated. The technical scheme provided by the invention particularly comprises the following step of: treating the 6000-series aluminum alloy sequentially in the following steps of: (1) solution treatment; (2) quenching; (3) pre-aging; (4) cold rolling and deforming; and (5) re-aging.

Description

technical field [0001] The invention belongs to the technical field of deformation heat treatment of aluminum alloys, and is especially suitable for 6000 series aluminum alloys. Background technique [0002] 6000 series aluminum alloys are age-strengthened alloys, such as 6061, 6056, 6082, 6013, 6063, etc., which have the characteristics of low density, medium strength, good weldability and formability, and are widely used in aerospace, transportation, construction and machinery Manufacturing and other industries. In order to obtain high strength, T6 treatment (peak aging) is often carried out in the industry, in order to form high-density nanoscale precipitated phases in the aluminum matrix to the greatest extent, such as GP regions, β″, β′, Q′, etc., so as to obtain the highest Alloy strength. However, during T6 treatment, on the one hand, the grain boundary precipitates are distributed in a continuous state, and form a continuous corrosion micro-battery together with the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04C21D8/02
Inventor 王芝秀苗芬芬李海
Owner CHANGZHOU UNIV
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