Preparation method of high-strength, high-toughness and corrosion-resistant 7055 aluminum alloy medium-thickness plate

A high-strength, high-toughness, aluminum alloy technology, applied in the field of aluminum alloy processing

Inactive Publication Date: 2021-09-28
TIANJIN ZHONGWANG ALUMINUM IND CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the purpose of the present invention is to provide a method for preparing high-strength, high-toughness an

Method used

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  • Preparation method of high-strength, high-toughness and corrosion-resistant 7055 aluminum alloy medium-thickness plate
  • Preparation method of high-strength, high-toughness and corrosion-resistant 7055 aluminum alloy medium-thickness plate
  • Preparation method of high-strength, high-toughness and corrosion-resistant 7055 aluminum alloy medium-thickness plate

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Embodiment 1

[0030] A method for preparing a high-strength, high-toughness, corrosion-resistant 7055 aluminum alloy medium-thick plate, comprising the following steps:

[0031] S1. Ingredients: Prepare aluminum alloy raw materials according to the following alloy elements and mass percentages

[0032]

[0033] The actual ratio of Zn to Mg is 3.87, and the ratio of Cu to Mg is 1.07;

[0034] S2. Smelting: Put the configured aluminum alloy raw materials into the melting furnace to melt into aluminum alloy melt, in which AlCu, AlZr, AlTi intermediate alloys, Mg ingots, and Zn ingots are added at a temperature between 720-760°C, and the melting is carried out after melting electromagnetic stirring;

[0035] S3. Casting: casting aluminum alloy melt into ingots, the casting temperature is controlled at 670-690°C, the measured hydrogen content: 0.097mL / 100gAl, the measured slag content: 18K / Kg, the crystallizer chooses a smaller size: 450mm×1580mm ;

[0036] S4. Homogenization: The ingot is...

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Abstract

The invention relates to a preparation method of a high-strength, high-toughness and corrosion-resistant 7055 aluminum alloy medium-thickness plate, and belongs to the field of aluminum alloy machining. The preparation method comprises the steps of material proportioning, smelting, casting, homogenizing, sawing and milling, preheating, hot rolling, solid solution quenching, pre-stretching and aging. According to the preparation method of the high-strength, high-toughness and corrosion-resistant 7055 aluminum alloy medium-thickness plate, parameters of various process steps are optimized, the Zn/Mg ratio and the Cu/Mg ratio are reasonably controlled, and a foundation is laid for obtaining a finished product with good performance; a two-stage homogenization system of 465 DEG C/(10-15) h + 475 DEG C/(20-25) h is adopted, an eutectic structure is eliminated on the premise of avoiding overburning of an aluminum alloy cast ingot, and a primary phase generated in the casting process is regulated and controlled; crystalline grains are completely crushed and refined by adopting a rolling mode with a large machining rate and a large rolling reduction in a middle pass; the initial rolling temperature and the final rolling temperature are accurately controlled, so that the recrystallization degree and the grain size of the plate are controlled, and then the strength, the fracture toughness and the exfoliation corrosion resistance of the plate are improved; and a three-stage aging system (100-110) DEG C/24h + (175-185) DEG C/(30-120) min + 121 DEG C/24h is adopted, so that the comprehensive performance of a finished product is improved.

Description

technical field [0001] The invention belongs to the field of aluminum alloy processing, and relates to a preparation method of a high-strength, high-toughness, corrosion-resistant 7055 aluminum alloy medium-thick plate. Background technique [0002] 7055 aluminum alloy is an outstanding representative of new high-strength aluminum alloys. It has the characteristics of low density, high strength, good toughness and corrosion resistance. High-quality material for wing skins. However, realizing efficient industrial production of 7055 aluminum alloy plate with ultra-high strength, high toughness, and high corrosion resistance is a difficult point that has not yet been completely broken through in China. Contents of the invention [0003] In view of this, the object of the present invention is to provide a method for preparing a high-strength, high-toughness, corrosion-resistant 7055 aluminum alloy medium-thick plate, so as to solve the shortcomings of the existing 7055 alumin...

Claims

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Application Information

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IPC IPC(8): C22C21/10C22C1/03B22D7/00C22F1/053C21D1/18C21D8/02
CPCC22C21/10C22C1/026C22C1/03B22D7/005C22F1/053C22F1/002C21D8/0226C21D8/0247
Inventor 玄宝葛浩龙张纪涛张宏庆杜凤彪付彦军景子毅赵俊才程素玲祖立成
Owner TIANJIN ZHONGWANG ALUMINUM IND CO LTD
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