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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 for block-shaped and asymmetrical-shaped workpieces, and during the pre-stretching process, If the strain is too small, the stress relief rate is too low, and if the strain is too large, new residual stress will be generated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Mg-8wt.%Al-0.4wt.%Zn magnesium alloy (abbreviated as AZ80) 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 In the process of cross-section extrusion, online quenching was carried out by spraying water at room temperature (20°C). After quenching, there was a strong residual stress. Two 500mm long magnesium alloy rods were taken at the adjacent positions of the same root material for experimental comparison.

[0025] Place the light alloy material in an ultra-low temperature liquid nitrogen box at -196°C for heat preservation to ensure that the core temperature 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 core temperature of the material is consistent with the surface ...

Embodiment 2

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

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

Embodiment 3

[0033] The composition content of 7055 aluminum alloy is: Zn: 7%, Cu: 1.8%, Mg: 2.3%, Zr: 0.1%, and the balance is Al. The complex forgings of 7055 aluminum alloy are forged and deformed, and then solution treated. The solution temperature is 475°C and kept for 2 hours, and then immersed in water at room temperature to cool, forming a large residual stress, which is deformed during the subsequent machining process and scrapped. High rate.

[0034] Cryogenic and rapid heat treatment: the aluminum alloy forging is placed in a low-temperature liquid nitrogen box at a temperature of -196°C for 6 hours, and the core temperature of the material is consistent with the surface temperature. After the completion, transfer the aluminum alloy forging to the steam furnace within 2 minutes, and keep it at 160°C for 1 hour, and the temperature of the core of the material is consistent with the surface temperature. After completion, place in air and cool to room temperature (18°C).

[0035]...

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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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