Processing method for eliminating residual stress of light alloy material

A technology of residual stress and treatment method, which is applied in the field of treatment to eliminate residual stress of light alloy materials, can solve the problems of small stress elimination rate and large strain, and achieve the effect of eliminating residual stress and improving toughness

Inactive Publication Date: 2019-05-14
青岛四通八达商贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in industrial production, pre-stretching is the most commonly used process for eliminating residual stress. It has the advantages of simple process, fast speed, and high stress relief rate, but it is not suitable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1

[0024] Mg-8wt.%Al-0.4wt.%Zn magnesium alloy (AZ80 for short) is a commonly used commercial magnesium alloy with a thermal conductivity of about 82W / (m·K). It is produced by hot extrusion with a thickness of 290mm×230mm During the cross-section extrusion process, online quenching is performed by spraying room temperature (20℃) water. After quenching, there is a strong residual stress. Two 500mm long magnesium alloy bars are taken from adjacent positions of the same material for experimental comparison.

[0025] Place the light alloy material in an ultra-low temperature liquid nitrogen tank at -196℃ to ensure that the temperature of the core of the material is consistent with the surface temperature.

[0026] Cryogenic and rapid heat treatment: Place one of the above-mentioned magnesium alloy rods in a low-temperature liquid nitrogen box at a temperature of -196°C for 12 hours. The temperature of the core of the material is consistent with the surface temperature. A...

Example Embodiment

[0028] Example 2

[0029] Mg-7wt.%Gd-5wt.%Y-1wt.%-0.5wt.%Zr magnesium alloy (EW75 for short) is a commonly used rare earth magnesium alloy with a thermal conductivity of about 40W / (m·K). Extrusion method produces 290mm×20mm thick extruded materials. In order to ensure the performance, room temperature water (20℃) is sprayed up and down for on-line quenching. After quenching, there is strong residual stress. The warpage of 2000mm long materials is 2mm.

[0030] Cryogenic and rapid heat treatment: Place the magnesium alloy strips in a low-temperature liquid nitrogen box at a temperature of -196°C for 3 hours, and the temperature of the core of the material is consistent with the surface temperature. After completion, transfer the magnesium alloy strips to a steam furnace within 2 minutes, and keep the temperature at 200°C for 1 hour. The temperature of the core of the material is consistent with the surface temperature. After completion, place it in the air and cool to room temperat...

Example Embodiment

[0032] Example 3

[0033] The 7055 aluminum alloy composition content is: Zn: 7%, Cu: 1.8%, Mg: 2.3%, Zr: 0.1%, and the balance is Al. Forging deformation of 7055 aluminum alloy complex forgings, and then solution treatment, the solution temperature is 475 ℃ for 2 hours, and then immersed in room temperature water for cooling, forming a large residual stress, deformed in the subsequent machining process, scrapped The rate is high.

[0034] Cryogenic and rapid heat treatment: Place the aluminum alloy forgings in a low-temperature liquid nitrogen box at a temperature of -196°C for 6 hours, and the temperature of the core of the material is consistent with the surface temperature. After completion, the aluminum alloy forgings are transferred to the steam furnace within 2 minutes, and the temperature is kept at 160°C for 1 hour. The temperature of the core of the material is consistent with the surface temperature. After completion, place it in the air and cool to room temperature (1...

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Abstract

The invention relates to a processing method for eliminating the residual stress of the light alloy material, and is suitable for eliminating the quenching residual stress of various shapes and size light alloy materials. The method comprises the following steps of after quenching treatment, carrying out cryogenic treatment on the light alloy material; after subzero treatment, rapidly transferringthe light alloy material into a steam box for quenching heat treatment; and then carrying out air cooling to room temperature. The method disclosed is not limited by the size and shape of the material, the residual stress of the light alloy material is greatly reduced, and the strength and toughness of the light alloy material are synchronously improved.

Description

technical field [0001] The invention relates to a treatment method for eliminating residual stress of light alloy materials, which is suitable for eliminating quenching residual stress of light alloy materials of various shapes and sizes. Background technique [0002] The structure and performance of wrought light alloy materials have wider advantages, especially the comprehensive performance of better room temperature, high temperature performance and corrosion resistance, which meets the requirements of aerospace lightweight performance integration, and has broad application and development prospects. [0003] After the alloy is deformed, in order to suppress the deformation precipitation and retain the deformed structure, online quenching and rapid cooling treatment is required, or in order to obtain higher aging strength, the alloy needs to be solution treated and quenched to dissolve all the strengthening elements into the matrix, which is the aging process. prepare. D...

Claims

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Application Information

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IPC IPC(8): C22F1/00
Inventor 吕淑敏
Owner 青岛四通八达商贸有限公司
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