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A kind of heat treatment method of al-mg-si alloy for ships

A heat treatment method and alloy technology, applied in the field of aluminum alloy processing, can solve the problems of limiting the application potential and service life of components, insufficient mechanical properties and corrosion resistance, lack of alloy precipitation and growth control, etc. Improved performance and low grain boundary phase density

Active Publication Date: 2022-05-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the 5xxx series aluminum alloys are very corrosion resistant, their mechanical properties are poor
The mechanical properties of 6xxx series aluminum alloys are better than those of 5xxx series aluminum alloys, but in engineering applications, the mechanical properties and corrosion resistance of 6xxx series aluminum alloys are still insufficient, which affects the use of its structural parts and limits its application potential and service life
Chinese patent (CN 105543738B) is a deformation heat treatment method for aluminum alloys. This invention increases the density of alloy precipitates and improves the mechanical properties of alloys through double-stage aging at low temperature and high temperature. However, this method lacks the precipitation of intergranular phases of alloys. and growth control, which is not conducive to effectively improving the corrosion resistance of the alloy

Method used

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  • A kind of heat treatment method of al-mg-si alloy for ships
  • A kind of heat treatment method of al-mg-si alloy for ships

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Configure the Al-Mg-Si alloy according to the following weight percentage: 3.1% Mg, 2.2% Si, 0.45% Mn, 0.45% Ag, 0.15% Zr, 0.3% Cr, 0.3% Ti, the balance is Al, after smelting, casting, Homogenization annealing, hot rolling, intermediate annealing, cold rolling to 5mm thickness. Solution treatment at 500℃ / 5h, followed by 150~155 / 20min+180~195℃ / 0.7~1h+170~180℃ / 5h aging treatment, and then room temperature tensile test and exfoliation corrosion test for the aged alloy . Exfoliation corrosion resistance is tested according to GB / T22639-2008. The corrosion solution is 3.0% NaCl+10ml / L HCl deionized water, the test temperature is 35±2°C, the corrosion time is 24h, and the ratio of the surface area of ​​the sample to the volume of the test solution is less than 20mm 2 / mL. The corroded samples were washed with water, dried and then evaluated for corrosion grade.

Embodiment 2

[0032]The Al-Mg-Si alloy is configured according to the following weight percentages: 3.3% Mg, 1.8% Si, 0.55% Mn, 0.3% Ag, 0.3% Zr, 0.15%, 0.32Cr, 0.2% Ti, and the balance is Al. After smelting, casting, homogenizing annealing, hot rolling, intermediate annealing, and cold rolling to a thickness of 5 mm. After solution treatment at 510°C / 5h, then aging treatment at 140-150°C / 60min+200-220°C / 0.6h+150-165°C / 7h, and then the mechanical properties and exfoliation corrosion resistance tests were carried out on the aged alloy. Exfoliation corrosion resistance is tested according to GB / T22639-2008. The corrosion solution is 3.0% NaCl+10ml / L HCl deionized water, the test temperature is 35±2°C, the corrosion time is 24h, and the ratio of the surface area of ​​the sample to the volume of the test solution is less than 20mm 2 / mL. The corroded samples were washed with water, dried and then evaluated for corrosion grade.

Embodiment 3

[0034] The Al-Mg-Si alloy is configured according to the following weight percentages: 1.9% Mg, 3.3% Si, 0.65% Mn, 0.29% Ag, 0.25% Zr, 0.35% Cr, 0.2% Ti, and the balance is Al. After smelting, casting, homogenizing annealing, hot rolling, intermediate annealing, and cold rolling to a thickness of 5mm. After solution treatment at 500°C / 5h, aging treatment at 160°C / 50min+210°C / 1h+170°C / 8h was performed, and then the mechanical properties and exfoliation corrosion resistance tests were carried out on the aged alloy. Exfoliation corrosion resistance is tested according to GB / T22639-2008. The corrosion solution is 3.0% NaCl+10ml / L HCl deionized water, the test temperature is 35±2°C, the corrosion time is 24h, and the ratio of the surface area of ​​the sample to the volume of the test solution is less than 20mm2 / mL. The corroded samples were washed with water, dried and then evaluated for corrosion grade.

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Abstract

The invention discloses a heat treatment method for an Al-Mg-Si alloy used in ships, and belongs to the technical field of aluminum alloy heat treatment. In this method, after solid solution treatment of the alloy, the first-stage aging treatment is carried out at 140-160°C for 15min-60min, the second-stage aging treatment is carried out at 180-220°C for 0.5-1h, cooled to room temperature, and the third aging treatment is carried out immediately. The third aging treatment is to keep warm at 150-180°C for 4-8 hours, and then cool to room temperature. This method can significantly improve the microstructure of the Al-Mg-Si alloy, causing a large amount of β" phase (Mg 5 Si 6 ), the β phase on the grain boundary (Mg 2 Si) less, and discontinuous distribution. This is of great value to the development of a new generation of high-strength, corrosion-resistant aluminum alloys for ships.

Description

technical field [0001] The invention relates to a processing method of an aluminum-based alloy, in particular to a heat treatment method of an Al-Mg-Si alloy for ships for improving the corrosion resistance of the aluminum alloy and maintaining its strength, and belongs to the technical field of aluminum alloy processing. Background technique [0002] At present, the corrosion-resistant aluminum alloys widely used in the field of nautical ships are mainly 5xxx series Al-Mg and 6xxx series Al-Mg-Si aluminum alloys. Although the 5xxx series aluminum alloys are very corrosion resistant, their mechanical properties are poor. The mechanical properties of 6xxx series aluminum alloys are better than those of 5xxx series aluminum alloys, but in engineering applications, the mechanical properties and corrosion resistance of 6xxx series aluminum alloys are still insufficient, which affects the use of its structural parts and limits its application potential and service life. The prop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/05C22F1/043C22F1/047C22C21/08C22C21/02
CPCC22C21/02C22C21/08C22F1/043C22F1/047C22F1/05
Inventor 罗兵辉郑亚亚柏振海任智炜
Owner CENT SOUTH UNIV
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