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Heat treatment process of powder metallurgy aluminum alloy cold-rolled sheet

A technology of powder metallurgy and aluminum alloy, which is applied in the field of aluminum alloy and can solve the problems of unsuitability for industrial application

Active Publication Date: 2020-11-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the material after cold rolling has internal stress and is not suitable for industrial applications

Method used

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  • Heat treatment process of powder metallurgy aluminum alloy cold-rolled sheet
  • Heat treatment process of powder metallurgy aluminum alloy cold-rolled sheet
  • Heat treatment process of powder metallurgy aluminum alloy cold-rolled sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Prepare a 2A12 aluminum alloy plate with a thickness of 0.5mm;

[0056] According to the production method of the present invention, the 250-300 mesh spherical 2A12 aluminum alloy powder (nearly spherical powder prepared by water atomization method) produced by Changsha Tianjiu Metal Material Co., Ltd. is used as raw material powder (its chemical composition meets the requirements of GB / T3190) , the sheet production process is as follows figure 1 As shown, the powder is pressed into a steel mold to prepare a green billet (the thickness of the green billet is 3mm), and the green billet is sintered in a high-vacuum precision vacuum hot-press furnace to prepare a cold-rolled sheet material (sintering temperature 575 ° C, time 120min, The pressure is 10MPa), the sintered billet is annealed, the annealing temperature is 420 °C; the holding time is 60 minutes, after the holding time is completed, it is cooled in the furnace to below 260 °C at a speed of no more than 30 °C / h ...

Embodiment 2

[0064] Prepare a 2A12 aluminum alloy plate with a thickness of 1.0mm;

[0065] Its preparation process is consistent with that of Example 1, see the heat treatment process of Example 1 for details (the total deformation of the plate is 60%). The obtained sheet has a tensile strength of 420MPa, an elongation of 6.28%, and a hardness of 123.06HV.

[0066] The above experiment was repeated 100 times, and the yield was 99%. It can be seen from Examples 1 and 2 that the total deformation of the rolled plate affects its tensile strength.

Embodiment 3

[0068] Prepare a 2A12 aluminum alloy plate with a thickness of 0.5mm;

[0069] According to the production method of the present invention, the 250-300 mesh spherical 2A12 aluminum alloy powder (nearly spherical powder prepared by water atomization method) produced by Changsha Tianjiu Metal Material Co., Ltd. is used as raw material powder (its chemical composition meets the requirements of GB / T3190) , the sheet production process is as follows figure 1 As shown, the powder is pressed into a steel mold to prepare a green billet (the thickness of the green billet is 3mm), and the green billet is sintered in a high-vacuum precision vacuum hot-press furnace to prepare a cold-rolled sheet material (sintering temperature 575 ° C, time 120min, The pressure is 10MPa), the sintered billet is annealed, the annealing temperature is 420 °C; the holding time is 60 minutes, after the holding time is completed, it is cooled in the furnace to below 260 °C at a speed of no more than 30 °C / h ...

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Abstract

The invention provides a heat treatment process of a powder metallurgy aluminum alloy cold-rolled sheet. The heat treatment process comprises the steps of aluminum alloy powder pressing forming, sintering, annealing, cold rolling, intermediate annealing, finishing and heat treatment. Sintering is carried out in a vacuum hot pressing furnace; before cold rolling, blank annealing is conducted on a sintered blank; cold rolling is divided into two stages, in the first stage, when the cold rolling reduction rate is smaller than 60%, single-pass cold rolling with the rolling reduction amount smallerthan 3% and intermediate annealing are adopted in the stage, and cold rolling and intermediate annealing are alternately carried out till the total rolling reduction amount of the sheet reaches 60%;and when the total rolling reduction amount of cold rolling is larger than 60%, the second stage is executed, three passes of cold rolling (the rolling reduction of each pass is smaller than 3%) and intermediate annealing are adopted in the second stage, and the three passes of cold rolling and intermediate annealing are alternately conducted till the thickness of a sheet strip reaches the targetthickness. Heat treatment is that solid solution and aging treatment are carried out on the sheet with the required thickness so as to meet the final use requirement. The tensile strength of a powdermetallurgy 2A12 aluminum alloy obtained through the heat treatment process reaches about 540 MPa. The heat treatment process of the powder metallurgy 2A12 aluminum alloy cold-rolled sheet is high in practicability and wide in application range, and the mechanical property of the powder metallurgy aluminum alloy cold-rolled sheet can be remarkably improved.

Description

technical field [0001] The invention relates to a heat treatment process for powder metallurgy aluminum alloy cold-rolled plates, which belongs to the technical field of aluminum alloys. Background technique [0002] The present invention is on the basis of previous work (a production method of aluminum alloy thin plate CN 109317679B), process optimization and deepening research. [0003] Aluminum alloy plate is an industrial building material, which is used in various industries according to different materials, such as aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry and other industries. [0004] At present, aluminum alloy sheet is the main type of aluminum alloy profile, and it is also the one with the largest industrial consumption. Its production method is through aluminum alloy or direct cold casting into ingot, or continuous casting into thick strip, and then hot rolling The plate is formed into a predetermined thickness, ...

Claims

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Application Information

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IPC IPC(8): C22F1/04B22F3/24
CPCB22F3/24B22F2003/248C22F1/04
Inventor 马运柱王涛杨伦黄宇峰刘文胜刘超伍镭颜焕元赵心阅
Owner CENT SOUTH UNIV
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