Method for improving size stability of aluminum alloy for aerospace

A dimensional stability, aerospace technology, applied in the field of non-ferrous metal processing, can solve the problems of long-term use of aerospace inertial devices, deterioration of LY12 material structure stability, reduction of aircraft accuracy and service life, etc., to promote dimensional stability , good isotropy, and the effect of reducing residual stress

Active Publication Date: 2016-08-03
CENT SOUTH UNIV
View PDF3 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] When the LY12 material processed by the prior art is applied in aerospace inertial devices and other fields, due to the action of alternating temperature, thermal stress, processing stress, etc., the material will undergo obvious changes in tissue structure and stress state, especially in the alternating temperature field. If the range of change is large, the material will even undergo a phase transition, which will further aggravate the change of the internal stress of the material; all of the above will lead to the deterioration of the structure stability of the existing LY12 material, and even deformation. The error caused by this small deformation will be Significantly reduces the accuracy and service life of the aircraft
It has extremely adverse effects on the long-term use of aerospace inertial devices

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for improving size stability of aluminum alloy for aerospace
  • Method for improving size stability of aluminum alloy for aerospace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) The LY12 aluminum alloy ingot is subjected to double-stage homogenization treatment, the temperature and time of the double-stage homogenization treatment are 420°C, 12h and 460°C, 0.5h, respectively, and the cooling method is air cooling.

[0038] (2) The homogenized LY12 aluminum alloy was subjected to 4 passes of hot rolling, and the hot rolling temperature was 380°C. The hot-rolled LY12 aluminum alloy was etched in a sodium hydroxide solution with pH=11, and the etching time was 1 min. Afterwards, it was washed with water for 1 min, and placed in a nitric acid solution with pH=2 for neutralization treatment for 1 min.

[0039] (3) The cleaned LY12 aluminum alloy is subjected to 4 passes of cold rolling, and after one pass is rolled, the next pass is rolled with a reverse direction of 90°. Intermediate annealing treatment is adopted after each rolling pass, and the temperature and time of intermediate annealing are respectively 280°C and 0.5h.

[0040] (4) The ...

Embodiment 2

[0045] (1) The LY12 aluminum alloy ingot is subjected to double-stage homogenization treatment, the temperature and time of the double-stage homogenization treatment are 460°C, 36h and 490°C, 3h, respectively, and the cooling method is air cooling.

[0046] (2) The homogenized LY12 aluminum alloy was subjected to 8 passes of hot rolling, and the hot rolling temperature was 440°C. The hot-rolled LY12 aluminum alloy was etched in a sodium hydroxide solution with a pH of 14, and the etching time was 4 min. After that, it was washed with water for 4 minutes, and placed in a nitric acid solution with pH=3 for neutralization treatment for 4 minutes.

[0047] (3) The cleaned LY12 aluminum alloy is subjected to 8 passes of cold rolling, and after one pass is rolled, the next pass is rolled with a reverse direction of 90°. After each rolling pass, intermediate annealing treatment is adopted, and the temperature and time of intermediate annealing are 370°C and 2.5h respectively.

[00...

Embodiment 3

[0053] (1) The LY12 aluminum alloy ingot is subjected to double-stage homogenization treatment, the temperature and time of the double-stage homogenization treatment are 430°C, 18h and 480°C, 2h, respectively, and the cooling method is air cooling.

[0054] (2) The homogenized LY12 aluminum alloy was subjected to 6 passes of hot rolling, and the hot rolling temperature was 400°C. The hot-rolled LY12 aluminum alloy was etched in a sodium hydroxide solution with a pH of 12, and the etching time was 2 min. After that, it was washed with water for 3 minutes, and placed in a nitric acid solution with pH=2 for neutralization treatment for 2 minutes.

[0055] (3) The cleaned LY12 aluminum alloy is subjected to 5 passes of cold rolling, and after one pass is rolled, the next pass is rolled with a reverse direction of 90°. After each rolling pass, intermediate annealing treatment is adopted, and the temperature and time of intermediate annealing are respectively 320°C and 1.5h.

[00...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for improving the size stability of an aluminum alloy for aerospace, and belongs to the technical field of nonferrous metal machining. The method includes the step that an LY12 aluminum alloy subject to dual-stage homogenization treatment is sequentially subject to multi-pass hot rolling, multi-pass reversing cold rolling, dual-stage solid solution water quenching treatment and dual-stage aging treatment, and the aluminum alloy which is uniform in grain size, stable in tissue and smaller in residual stress is obtained. Compared with a conversional treatment method, the method for obtaining the LY12 aluminum alloy has the beneficial effects that the surface residual stress of the aluminum alloy can be effectively reduced by 10 MPa to 50 MPa, the micro yield strength of the aluminum alloy can be improved by 30 MPa to 60 MPa, and the size change is smaller than 0.01% after the aluminum alloy is placed at the indoor temperature for more than half a year. The method is easy and convenient in operation process, the cost is lower, the technological process is greatly simplified, and the treated aluminum alloy is uniform in grain size, stable in tissue and small in residual stress. The method has a quiet positive effect on improving the using accuracy of aerospace inertial components in China and prolonging the service life of the aerospace inertial components in China. The method is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for improving the dimensional stability of an aluminum alloy used in aerospace, and belongs to the technical field of nonferrous metal processing. Background technique [0002] LY12 aluminum alloy material has the advantages of light weight, high specific strength and specific modulus, excellent mechanical properties and processing properties, and can be widely used in aerospace, electronics, shipbuilding and construction industries. Especially in the field of aerospace inertial devices, aluminum alloy can effectively reduce the weight of the aircraft, reduce energy consumption, and prolong the service life of the product. [0003] LY12 material is a commonly used material in aerospace inertial devices and other fields. Due to the particularity of the application environment in aerospace inertial devices and other fields, long-term work in a drastically changing alternating temperature field, therefore, it is required ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C22F1/057C23G1/12C23G1/22
CPCC22F1/002C22F1/057C23G1/125C23G1/22
Inventor肖来荣宋宇峰赵小军蔡圳阳余宸旭郭蕾刘子炜
OwnerCENT SOUTH UNIV