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Aging heat treatment method of 2219 aluminum alloy

A heat treatment method and aging treatment technology, applied in the field of aluminum alloy heat treatment, can solve the problems of poor welding performance, low corrosion resistance, low tensile properties and hardness values ​​of 2219 aluminum alloy, so as to improve the strength and hardness and expand the application range effect

Inactive Publication Date: 2013-12-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the 2A14 aluminum alloys are still used in my country. Although this aluminum alloy has the advantages of high strength, good heat strength, and good machinability, its corrosion resistance is not high and its welding performance is poor.
2219 aluminum alloy has good high and low temperature mechanical properties, fracture toughness, but poor stress corrosion resistance and welding performance. Therefore, my country has fully adopted 2219 aluminum alloy material with better weldability on the storage tank of the new generation of launch vehicles.
The tensile properties and hardness values ​​of the 2219 aluminum alloy obtained by the above method are relatively low, so the scope of industrial application is limited to a certain extent

Method used

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  • Aging heat treatment method of 2219 aluminum alloy
  • Aging heat treatment method of 2219 aluminum alloy
  • Aging heat treatment method of 2219 aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The 2219 aluminum alloy sheet used in the experiment was provided by Tianjin Aerospace Long March Rocket Manufacturing Co., Ltd. The sheet is in an annealed state, and the thickness of the sheet is 7 mm. The hardness sample is a 10mm×10mm block with a thickness of 7mm. Tensile samples are processed and formulated according to GB / G 228-2002 "Metallic Materials Tensile Test Methods". Take six groups of samples and take two hardness samples and two tensile samples for each group of samples, and the dimensions are the same. Solution treatment was carried out at 515°C, 525°C, 535°C, 540°C, 545°C and 565°C for 30 minutes, and then the treated samples at each solution temperature were placed in water at room temperature. Quenching for 5 minutes, wherein the quenching transfer time is less than 10 seconds, and finally the sample is aged in an oven at 175 ° C for 15 h, and then the sample is air-cooled. Metallographic analysis of the sample: the model of optical microscope use...

Embodiment 2

[0022] Take six groups of samples and take two hardness samples and two tensile samples for each group of samples, and the size of the samples is the same as that of Example 1. The five groups of samples were solution treated at 535°C for 5, 10, 20, 30, and 40 minutes respectively, and then quenched in water at room temperature for 5 minutes, wherein the quenching transfer time was less than 10 seconds, and finally the samples were treated at 175 °C in an oven for 15 h, and then the samples were air-cooled. The sample is subjected to metallographic structure analysis, hardness and tensile property test, and the model of the testing instrument used is the same as that of Example 1. Hardness and tensile strength as image 3 , Figure 4 shown.

Embodiment 3

[0024] Take nine groups of samples and take two hardness samples and two tensile samples for each group of samples, and the size of the samples is the same as that of the first embodiment. Nine groups of samples were solid solution treated at 535°C for 40min, then quenched in water at room temperature for 5min, wherein the quenching transfer time was less than 10 seconds, and finally nine groups of hardness and tensile samples were respectively placed in an oven at 160°C Aging 0h, 3h, 6h, 9h, 12h, 15h, 18h, 21h, 24h, and then air-cool the sample. The sample is subjected to metallographic structure analysis, hardness and tensile property test, and the model of the testing instrument used is the same as that of Example 1. Hardness and tensile strength as Figure 5 , Figure 6 shown.

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Abstract

The invention discloses an aging heat treatment method of 2219 aluminum alloy, and belongs to the field of aluminum alloy heat treatment technology. The method comprises the following steps of: performing solid solution treatment to 2219 aluminum alloy for 5-40 minutes under the condition of 515 DEG C to 565 DEG C by adopting a T6 heat treatment method, then quenching in water for 5 minutes at room temperature, wherein the quenching transfer time is less than 10 seconds; finally, performing aging treatment for 1 to 21 hours at the temperature of 160 DEG C to 190 DEG C. The aging heat treatment method has the following advantages that the influence of heat treatment parameters on the mechanical performance of 2219 aluminum alloy is systematically researched by adopting a method of controlling variables, so that when the alloy is subjected to 40-minute solid solution at 535 DEG C and 12-hour aging at 175 DEG C, the mechanical performance of the alloy can be improved, and the application range of the aluminum alloy in the industrial field can be widened to a greater extent.

Description

technical field [0001] The invention relates to an aging heat treatment method for 2219 aluminum alloy, belonging to the technical field of aluminum alloy heat treatment. Background technique [0002] Aluminum alloys are the preferred materials for lightweight aircraft and spacecraft, among which the most widely used are 2000 (Al-Cu) and 7000 (Al-Zn-Mg-Cu) aluminum alloys, both of which are heat treatable aluminum alloys ( Light Alloy Processing Technology, 2005, 33(8): 13-17). The working temperature of the rocket tank is relatively low, which requires that it must have good mechanical properties and weldability (Missile and Space Launch Technology, 2001, 69(254): 32-46). At present, most of the 2A14 aluminum alloys are still used in our country. Although this aluminum alloy has the advantages of high strength, good heat strength, and good machinability, its corrosion resistance is not high and its welding performance is poor. 2219 aluminum alloy has good high and low tem...

Claims

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Application Information

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IPC IPC(8): C22F1/057
Inventor 赵乃勤刘燕师春生何春年刘恩佐李家俊
Owner TIANJIN UNIV
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