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Heat treatment method capable of improving anti-fatigue performance of aluminum alloy

A heat treatment method and technology of the treatment method, applied in the field of heat treatment of metal materials, can solve the problems of weakening and reducing the fatigue resistance of alloys, and achieve the effects of reducing damage accumulation, eliminating obstacles to reciprocating sliding of dislocations, and excellent fatigue resistance.

Active Publication Date: 2013-04-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Gaussian texture belongs to the deformation texture, and recrystallization annealing will weaken or even eliminate the Gaussian texture and reduce the fatigue resistance of the alloy.

Method used

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  • Heat treatment method capable of improving anti-fatigue performance of aluminum alloy
  • Heat treatment method capable of improving anti-fatigue performance of aluminum alloy
  • Heat treatment method capable of improving anti-fatigue performance of aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1（300

[0025] Example 1 (300 degree annealed state);

[0026] The composition of alloy 1 is: 3.8%Cu, 1.4%Mg, 0.6%Mn, 0.05%Ti, and the balance is aluminum. After the cold-rolled sheet is annealed at 300°C for 120 minutes, it is solution treated at 505°C for 20 minutes and quenched in water. After natural aging at room temperature for more than 100 hours, the mechanical properties at room temperature reach: the tensile strength is 435MPa, yield Strength is 290MPa, elongation is 24.4%; fatigue resistance: ΔK=25MPam 1 / 2 ,da / dN=1.5×10 -3 mm / cycle.

Embodiment 2（350

[0027] Example 2 (350 degree annealing state);

[0028] The composition of alloy 2 is: 4.0% Cu, 1.5% Mg, 0.3% Mn, 0.10% Ti, and the balance is aluminum. After the cold-rolled sheet is annealed at 350°C for 90 minutes, it is solution treated at 500°C for 30 minutes and quenched in water. After natural aging at room temperature for more than 100 hours, the mechanical properties at room temperature reach: the tensile strength is 430MPa, yield Strength is 288MPa, elongation is 25.7%; fatigue resistance: ΔK=25MPam 1 / 2 ,da / dN=9.5×10 -4 mm / cycle.

Embodiment 3（400

[0029] Example 3 (annealed state at 400 degrees);

[0030] The composition of alloy 3 is: 4.5% Cu, 1.2% Mg, 0.4% Mn, 0.10% Ti, and the balance is aluminum. After the cold-rolled sheet is annealed at 400°C for 40 minutes, it is solution treated at 485°C for 60 minutes and quenched in water. After natural aging at room temperature for more than 100 hours, the mechanical properties at room temperature reach: the tensile strength is 400MPa, yield Strength is 260MPa, elongation is 27.2%; fatigue resistance: ΔK=25MPam 1 / 2 ,da / dN=5.7×10 -4 mm / cycle.

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Abstract

The invention relates to a heat treatment method capable of improving the anti-fatigue performance of Al-Cu-Mg alloy. The method comprises the following steps: performing intermediate annealing on a cold-rolled plate at the temperature of between 300 and 440 DEG C for 20 to 120 minutes; performing solution hardening treatment at the temperature of between 475 and 505 DEG C for 10 to 120 minutes; and naturally ageing at room temperature for at least 100 hours. The Al-Cu-Mg alloy comprises the following components: Cu, Mg, Mn, Ti and Al. The process method is simple and reasonable. By the intermediate annealing heat treatment process, the Gauss texture score of the alloy is increased, and orientation of most of crystal faces {111} of crystal grains of the cold-rolled Al-Cu-Mg alloy is positioned or close to the direction of the maximum external shearing stress, so that reciprocating sliding dislocated under the action of alternating stress is promoted, the closed effect of fatigue crack is improved, the spreading rate of the fatigue crack is reduced, and the alloy has excellent stress corrosion resistance and anti-stripping corrosion fatigue performance and is suitable for industrialized application.

Description

technical field [0001] The invention discloses a heat treatment method for improving the anti-fatigue performance of an aluminum alloy; in particular, it relates to an annealing treatment method for improving the anti-fatigue performance of an aluminum-copper-magnesium alloy. The invention belongs to the technical field of metal material heat treatment. Background technique [0002] As an Al-Cu-Mg alloy with medium strength and fatigue resistance, it is mainly used in aircraft skin materials, accounting for about 50% of the weight of aircraft materials, and has an extremely important position in the aviation field. At present, the application of anti-fatigue damage aluminum alloys in the aviation field is facing fierce competition from composite materials. How to further improve the fatigue resistance of the alloy is the key to its victory in this competition, which is of great significance to the application and development of the alloy in the aerospace field. [0003] St...

Claims

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Application Information

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IPC IPC(8): C22F1/057C22C21/16
Inventor 刘志义夏鹏李福东谷艳霞林茂
Owner CENT SOUTH UNIV
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