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A heat treatment technology for preparing high performance and low residual stress aluminum alloy

A technology of residual stress and aluminum alloy, which is applied in the field of heat treatment for preparing high-performance low-residual stress aluminum alloy, can solve the problems of consumption of plastic reserves of materials, strict requirements on material shape and size, and increased plastic deformation, so as to achieve fast heating speed and good High temperature environment, effect of reducing lattice distortion

Active Publication Date: 2019-12-20
HUNAN UNIV OF HUMANITIES SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical method of eliminating residual stress has a certain effect, but the mechanical method of eliminating residual stress is at the cost of increasing plastic deformation, which seriously consumes the plastic reserve of the material, and has strict requirements on the shape and size of the material

Method used

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  • A heat treatment technology for preparing high performance and low residual stress aluminum alloy
  • A heat treatment technology for preparing high performance and low residual stress aluminum alloy
  • A heat treatment technology for preparing high performance and low residual stress aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A 2xxx series alloy cold-rolled plate with a sample thickness of 6 mm was used, and its alloy composition was Al-4.45Cu-1.5Mg-0.54Mn (mass fraction %). Firstly, put the sample into an air furnace with a temperature of 495°C for 1 hour; then quench the sample at a low temperature, and then perform cryogenic deformation treatment on the quenched sample, and the deformation amount is 10%; after the cryogenic deformation treatment Immediately put it in a heat medium at 150°C for 12 minutes, and at the same time use a vibrator to vibrate it. The dynamic stress provided by the vibrator is 55MPa; finally, perform aging treatment with an aging temperature of 120°C and a time of 45h. The yield strength, tensile strength, elongation, residual stress measurement value and residual stress reduction rate of the 2xxx alloy treated in this embodiment are shown in Table 1.

Embodiment 2

[0050] A 2xxx series alloy cold-rolled plate with a sample thickness of 6 mm was used, and its alloy composition was Al-4.45Cu-1.5Mg-0.54Mn (mass fraction %). Firstly, put the sample in an air furnace with a temperature of 485°C and keep it warm for 1 hour; then the sample is subjected to low-temperature quenching, and the quenched sample is subjected to cryogenic deformation treatment, and the deformation amount is 25%; after cryogenic deformation treatment Immediately put it in a heat medium at 180°C for 10 minutes, and at the same time use a vibrator to vibrate it. The dynamic stress provided by the vibrator is 75MPa; finally, perform aging treatment with an aging temperature of 170°C and a time of 16h. The yield strength, tensile strength, elongation, residual stress measurement value and residual stress reduction rate of the 2xxx alloy treated in this embodiment are shown in Table 1.

Embodiment 3

[0052] A 2xxx series alloy cold-rolled plate with a sample thickness of 6 mm was used, and its alloy composition was Al-4.45Cu-1.5Mg-0.54Mn (mass fraction %). First, put the sample in an air furnace at 500°C for 1 hour; then quench the sample at low temperature, and then perform cryogenic deformation treatment on the quenched sample, and the deformation amount is 40%; after cryogenic deformation treatment Immediately put it in a heat medium at 200°C for 8 minutes, and at the same time, use a vibrator to vibrate it. The dynamic stress provided by the vibrator is 84MPa; finally, perform aging treatment with an aging temperature of 200°C and a time of 1.5h. The yield strength, tensile strength, elongation, residual stress measurement value and residual stress reduction rate of the 2xxx alloy treated in this embodiment are shown in Table 1.

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Abstract

The invention relates to a heat treatment technology for preparing a high-performance low-residual stress aluminum alloy, and belongs to the technical field of aluminum alloy thermomechanical treatment. The method comprises the steps that 1, after an aluminum alloy sample is subjected to solution treatment and heat preservation, then is subjected to low-temperature quenching, and the transfer timedoes not exceed 10 seconds; 2, the sample obtained in the step 1 is subjected to cryogenic deformation to obtain a cryogenic deformation sample, the cryogenic deformation treatment temperature is lower than minus 120 DEG C, and the cryogenic deformation is equal or greater than 5%; 3, the cryogenic deformation sample obtained in the step 2 is put into a hot medium, the cryogenic deformation sample is vibrated by a vibration exciter, heat preservation and vibration maintaining are carried out, and the sample after the vibration reverse quenching treatment is obtained; and 4, the sample after the vibration reverse quenching treatment in the step 3 is subjected to aging treatment, and a finished product is obtained. The aluminum alloy prepared by the heat treatment technology has high comprehensive performance and low residual stress, and the stability of the material in service process is remarkably improved.

Description

technical field [0001] The invention relates to a heat treatment technology for preparing an aluminum alloy with high performance and low residual stress, which can effectively improve the strength and plasticity of the aluminum alloy and significantly reduce the residual stress; it belongs to the technical field of aluminum alloy thermomechanical treatment. [0002] technical background [0003] As a non-ferrous metal structural material with excellent performance, aluminum alloy has been widely used in aerospace, automobile, ship and other fields. The rapid development of global social economy and science and technology has put forward higher and higher requirements for the performance of aluminum alloys, and the research on aluminum alloys has also deepened. [0004] The application of aluminum alloys in industry is increasing year by year, but the quality of finished products is uneven. It is imperative to produce high-quality aluminum alloy materials. With the continuo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/057C22F1/043C22F1/047C22F1/05C22C21/16C22C21/02C22C21/08
CPCC22C21/02C22C21/08C22C21/16C22F1/002C22F1/043C22F1/047C22F1/05C22F1/057
Inventor 陈志国马文静袁珍贵
Owner HUNAN UNIV OF HUMANITIES SCI & TECH
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