A kind of deformation heat treatment composite process of uniform structure of 7xxx aluminum alloy and its obtaining method

A deformation heat treatment and composite process technology, applied in the field of aluminum alloys, can solve the problems of time-consuming and energy-consuming, high processing cost, low production efficiency, etc., and achieve the effects of shortening the homogenization time, reducing the temperature, and saving energy consumption.

Active Publication Date: 2021-03-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The degree of alloying and segregation of 7xxx aluminum alloys is higher than that of 2xxx aluminum alloys, and 7055 aluminum alloy is the alloy with the highest degree of alloying, the most serious segregation, and the largest casting stress among 7xxx aluminum alloys, and usually requires long-term homogenization heat treatment , in order to better reduce internal macro segregation and eliminate casting stress, the homogenization process consumes time and energy
[0004] At present, the process of thermal processing and deformation after preparing 7xxx aluminum alloy is long, high energy consumption, high processing cost and low production efficiency

Method used

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  • A kind of deformation heat treatment composite process of uniform structure of 7xxx aluminum alloy and its obtaining method
  • A kind of deformation heat treatment composite process of uniform structure of 7xxx aluminum alloy and its obtaining method
  • A kind of deformation heat treatment composite process of uniform structure of 7xxx aluminum alloy and its obtaining method

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Experimental program
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Effect test

Embodiment 1

[0074] Figure 1 ~ Figure 3 EBSD (Electron Backscatter Diffraction) photographs and grain size distribution statistical diagrams of 7055 aluminum alloy ingots at different magnifications were sprayed and deposited. 72 μm, the size distribution is not uniform, and the grains with a diameter of about 45 μm account for the largest proportion; the specific process and process parameters of the spray deposition are:

[0075] Melting-atomization-spraying-deposition-solidification, 5 stages; this process has a fast solidification speed, and the temperature drop rate can reach 10 3-5 K / s, the microstructure of the formed ingot is fine equiaxed grain, and the composition segregation is small. The main process parameters are: pouring temperature 850°C, atomization gas velocity 30m 3 / min, the metal flow rate is 35kg / min, the gas metal ratio is 1, the air pressure is 0.8MPa, the spray angle is 30°, the deposition disc-nozzle distance is 220mm, and the deposition disc rotation speed is ...

Embodiment 2

[0087] According to the spray deposition process in Example 1, a 7055 aluminum alloy ingot with the same composition was prepared; the obtained aluminum alloy ingot was subjected to hot extrusion at an extrusion temperature of 420° C. and an extrusion ratio of 6.25 to obtain an extruded alloy; The obtained extruded alloy was heat-treated at 450°C for 6 hours and then at 470°C for 1 hour to obtain a heat-treated alloy; the obtained heat-treated alloy was subjected to aging treatment at 120°C / 12h to obtain a hot-processed 7055 aluminum alloy.

[0088] The thermally processed 7055 aluminum alloy prepared in Example 2 of the present invention is tested for mechanical properties (according to the standard method of GB / T 228-2002 "Metallic Materials Tensile Test Method at Room Temperature"), and the test results are: the average mechanical properties are yield strength, tensile strength The strength and elongation are respectively: 712MPa, 730MPa, 7.2%. The thermal processing techno...

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Abstract

The invention provides a method for obtaining a deformation heat treatment composite process for a uniform structure of 7xxx aluminum alloys, comprising: analyzing the grain structure of an aluminum alloy billet prepared by spray deposition, and judging whether the billet can be directly thermally deformed according to the characteristics of the grain structure; Carry out high-temperature deformation research on the ingot whose grain structure meets the requirements, retain the high-temperature deformation structure, observe the high-temperature deformation structure, and further determine whether the ingot can be directly thermally deformed; set the extrusion deformation process for the alloy that can be directly thermally deformed parameters; The homogenization process parameters of the extruded alloy were studied, and the deformation heat treatment composite process of the uniform structure of the 7xxx aluminum alloy was obtained. The deformation heat treatment composite process of the uniform structure of the 7xxx aluminum alloy provided by the invention is economical, rapid, reasonable and effective, and provides guidance for the preparation of the actual 7xxx series aluminum alloy. The invention also provides a deformation heat treatment composite process for the uniform structure of the 7xxx aluminum alloy.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to a deformation heat treatment composite process of a uniform structure of 7xxx aluminum alloys and a method for obtaining the same. Background technique [0002] Due to its high strength, high-strength aluminum alloys are often used in structural components in the aerospace field, while high-strength aluminum alloys prepared by melting and casting methods (such as 2xxx, 7xxx and other heat-treatable aluminum alloys) have complex alloy components and a high degree of alloying. High, it is very easy to form segregation of structure and composition, resulting in serious casting defects such as uneven distribution of elements and macro segregation, which must be homogenized before hot deformation (to improve the crystal structure inside the alloy and eliminate casting stress , a heat treatment method to reduce segregation) treatment to reduce its cracking tendency in subsequen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/053C22C21/10
CPCC22C21/10C22F1/002C22F1/053
Inventor 何国爱盛晓菲
Owner CENT SOUTH UNIV
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