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
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[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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