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High-strength high-toughness aluminum alloy pre-tensioned thick plate and preparation method thereof

A manufacturing method and pre-stretching technology, applied in the field of aluminum alloy pre-stretching thick plate and its manufacturing, can solve the problems of low strength, poor toughness of aluminum alloy structural materials, unreasonable addition amount, etc., and achieve simple operation and fatigue strength. and the effect of improving fracture toughness

Inactive Publication Date: 2009-06-03
NORTHEAST LIGHT ALLOY CO LTD
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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 high-strength, high-toughness aluminum alloy pre-stretched thick plate and its manufacturing method to solve the problem of unreasonable addition of Fe, Si and other elements in the 7A04 aluminum alloy, resulting in the formation of insoluble compounds or during casting. Eutectic compounds are produced, resulting in poor toughness and low strength of aluminum alloy structural materials, which cannot meet the problem of safe and reliable work for a long time in harsh working environments

Method used

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Examples

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Effect test

specific Embodiment approach 1

[0007] Embodiment 1: The high-strength and high-toughness aluminum alloy pre-stretched thick plate of this embodiment, the thick plate is composed of 1.40%-2.00% Cu, 1.80%-2.80% Mg, 0.20%-0.60% by weight Mn, 0.10%-0.25% Cr, 5.00%-6.50% Zn, 0-0.10% Si, 0.05%-0.25% Fe, 0-0.05% Ti, 0-0.10% Ni, 0.01- Composed of 0.05% single impurity, 0.01-0.10% total impurity and the balance Al, the thickness of the thick plate is 11mm-85mm, and the model of the thick plate is 7B04.

specific Embodiment approach 2

[0008] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the thick plate of this embodiment consists of 1.70% Cu, 2.40% Mg, 0.40% Mn, 0.15% Cr, 6.00% Zn, 0.05% Si, 0.15% Fe, 0.03% Ti, 0.05% Ni, 0.03% single impurity, 0.05% total impurity and the balance Al, the thickness of the thick plate is 50mm.

specific Embodiment approach 3

[0009] Specific Embodiment Three: The manufacturing method of the high-strength, high-toughness aluminum alloy pre-stretched thick plate of this embodiment is completed by the following steps: 1. Melting and casting of the flat aluminum alloy ingot; 2. Homogenization of the flat aluminum alloy ingot For annealing, set the melting furnace temperature to 490°C and heat for 5h to 7h; then set the melting furnace temperature to 455°C and heat for 49h to 51h to heat the flat aluminum alloy ingot to 450°C to 460°C; Hot rolling of aluminum alloy ingots. During hot rolling, the heating temperature of the ingots is 370°C-420°C, and the heat preservation is 1h-2h; the hot-rolled plate thickness is 11mm-85mm. 4. Quenching and pre-stretching the hot-rolled plates Stretching: first use a roller hearth quenching furnace to quench the thick plate, quenching: the temperature of solution treatment is 470°C±2°C, heat preservation for 1h-2h, transfer time is less than 30s, cooling water temperatu...

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Abstract

A high-strength high-toughness aluminum alloy pre-tensioned thick plate and a preparation method thereof relate to an aluminum alloy pre-tensioned thick plate and a preparation method thereof and aim at solving problems that due to a poorly soluble compound which is formed by Fe, Si and other elements in 7A04 aluminum alloy or due to a eutectic compound generated during casting, aluminum alloy structural materials have bad toughness and low strength so that long-time safe and reliable work in bad working environment cannot be realized. The thick plate consists of the following components according to percentage by weight: 1.40-2.00% of Cu, 1.80-2.80% of Mg, 0.20-0.60% of Mn, 0.10-0.25% of Cr, 5.00-6.50% of Zn, 0-0.10% of Si, 0.05-0.25% of Fe, 0-0.05% of Ti, 0-0.10% of Ni, 0.01-0.05% of single impurity, 0.01-0.10% of aggregate impurity and the balance of Al. The preparation method is as follows: fusing and casting a flat aluminum alloy cast ingot; and carrying out homogenizing annealing, hot rolling, quenching pre-tensioning and single and double aging treatment. The higher stress corrosion resistance capability, the anti-fatigue strength and the fracture toughness property of the aluminum alloy pre-tensioned thick plate prepared according to the method are obviously improved so as to satisfy the requirement of the long-time safe and reliable work in bad working environment.

Description

technical field [0001] The invention relates to an aluminum alloy pre-stretched thick plate and a manufacturing method thereof. Background technique [0002] High-strength, high-toughness aluminum alloys belong to the Al-Zn-Mg-Cu series of aluminum alloys. This alloy plate has excellent comprehensive properties after heat treatment. Its large-scale pre-stretched thick plate has the characteristics of easy processing and no warping after processing. Nearly Over the years, it has increasingly replaced large die forgings for important structural parts such as wall panels, bulkheads, and wing spars of large military aircraft, which can effectively reduce the strength loss of materials, reduce the weight of the aircraft body, and simplify the manufacturing of aircraft The process can promote the development of the aviation industry. [0003] Before the 1960s, the leading idea of ​​aircraft structural design was to pursue high static strength of materials. No matter in alloy desi...

Claims

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Application Information

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IPC IPC(8): C22C21/10C22F1/053C22C1/03B22D21/04
Inventor 吕新宇徐忠艳单长智李念奎何振波胡智敏王志超周静刘显东
Owner NORTHEAST LIGHT ALLOY CO LTD
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