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Thermomechanical treatment method for aluminium alloy grain refinement

A deformation heat treatment, aluminum alloy technology, applied in the field of material processing, can solve the problems of the limitation of the size of the workpiece processed by the processing equipment, the inability to achieve a fine-grained structure, the long and narrow grains of the plate, and the low processing cost, good generalizability, The effect is not difficult to operate

Active Publication Date: 2016-04-27
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of fine-grained materials by large plastic deformation technology usually requires a particularly large amount of deformation (the effective strain ε usually needs to reach 5~10) and extremely complicated deformation methods. Therefore, when preparing fine-grained materials by this technology, processing equipment and There are great restrictions on the size of the workpiece to be processed, and it is difficult to achieve large-scale production in industry
[0004] The conventional industrial aluminum alloy sheet preparation process is casting-homogenizing annealing-hot rolling-cold rolling-recrystallization annealing. However, this conventional sheet forming method cannot achieve a fine-grained structure, and the processing process is subject to the second Influenced by the state of phase precipitation, the plate is easy to form a microstructure with long and narrow grains after final annealing

Method used

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  • Thermomechanical treatment method for aluminium alloy grain refinement
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  • Thermomechanical treatment method for aluminium alloy grain refinement

Examples

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Effect test

Embodiment 1

[0025] A deformation heat treatment method for refining aluminum alloy grains, comprising the steps of:

[0026] 1) The Al-1.2Mn aluminum alloy plate with an initial thickness of 6mm (the mass percentage of Mn in the alloy is 1.2%) is kept at 410°C for 60min to make its structure reach a recrystallized state;

[0027] 2) Cool the aluminum alloy material after recrystallization annealing in step 1) to room temperature, and then perform rolling deformation, and the rolling deformation is 20%;

[0028] 3) The aluminum alloy material pre-deformed in step 2) is annealed at 275°C for a long time at a low temperature for 72 hours to change the existing form and distribution state of alloying elements in the aluminum alloy material;

[0029] 4) Cool the aluminum alloy material after the intermediate annealing in step 3) to room temperature and then perform rolling deformation, the total rolling deformation is 92%;

[0030] 5) The aluminum alloy rolled and formed in step 4) is subject...

Embodiment 2

[0047] A deformation heat treatment method for refining aluminum alloy grains, comprising the steps of:

[0048] 1) Heat the Al-1.2Mn aluminum alloy plate with an initial thickness of 6mm at 410°C for 60min to make its structure reach a recrystallized state;

[0049] 2) After the aluminum alloy material after the recrystallization annealing in step 1) is water-cooled to room temperature, rolling deformation is carried out, and the rolling deformation amount is 20%;

[0050] 3) The aluminum alloy material pre-deformed in step 2) is annealed at 275°C for a long time at a low temperature for 36 hours to change the existing state and distribution form of alloy elements in the aluminum alloy material;

[0051] 4) Cool the aluminum alloy material after the intermediate annealing in step 3) to room temperature and then perform rolling deformation, the total rolling deformation is 95%;

[0052] 5) Perform recrystallization annealing on the aluminum alloy rolled and formed in step 4) ...

Embodiment 3

[0055] A deformation heat treatment method for refining aluminum alloy grains, comprising the steps of:

[0056] 1) Heat the Al-1.2Mn aluminum alloy plate with an initial thickness of 6mm at 410°C for 60min to make its structure reach a recrystallized state;

[0057] 2) Cool the aluminum alloy material after recrystallization annealing in step 1) to room temperature, and then perform rolling deformation, and the rolling deformation is 20%;

[0058] 3) The aluminum alloy material pre-deformed in step 2) is annealed at 275°C for a long time at a low temperature for 72 hours to change the existing form and distribution state of alloying elements in the aluminum alloy material;

[0059] 4) Cool the aluminum alloy material after the intermediate annealing in step 3) to room temperature, and then carry out rolling deformation, and the total rolling deformation is 92%;

[0060] 5) Recrystallization annealing is performed on the aluminum alloy rolled and formed in step 4) at 300° C. ...

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Abstract

The invention discloses a thermomechanical treatment method for aluminium alloy grain refinement. The method comprises the following steps: insulating an aluminium alloy for 30-60min for 360-460 DEG C, then cooling the aluminium alloy material to room temperature and then carrying out rolling deformation with a rolling deformation amount of 18-30%, then carrying out low-temperature annealing treatment on the pre-deformed aluminium alloy material for 24-168h at 260-290 DEG C, cooling the aluminium alloy material subjected to the low-temperature annealing to room temperature and then carrying out rolling deformation with a total rolling deformation amount of 80-96%, and finally carrying out recrystallization annealing on the rolled-formed aluminium alloy for 0.5-24h at 260-310 DEG C. The structural state of an aluminium alloy plate treated by the method disclosed by the invention is uniform and fine isometric crystals, thus 1-2[mu]m fine-grain structural state is realized; and moreover, the method disclosed by the invention has the characteristic of no limits on machining equipment, and dimensions of machined workpieces.

Description

technical field [0001] The invention belongs to the technical field of material processing, and in particular relates to a deformation heat treatment method for refining aluminum alloy crystal grains. Background technique [0002] Due to its light weight, rich resources and good comprehensive performance, the application of aluminum alloys in high-tech fields such as machinery, transportation, aerospace and military industries has increased year by year. Therefore, the production of high-quality aluminum alloys, especially the preparation of uniform and refined structures Aluminum alloy materials become very necessary. [0003] Grain refinement, as a strengthening method that can simultaneously improve the strength and plasticity of materials, thereby improving the comprehensive mechanical properties of materials, has been widely concerned by material researchers. At present, as far as deformed aluminum alloys are concerned, especially those that cannot be strengthened by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04
CPCC22F1/04
Inventor 陈兴品李晓光李思陈丹孙洪福刘庆
Owner CHONGQING UNIV
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