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An aging heat treatment method to maintain the strength of aluminum alloy and reduce the quenching residual stress

A technology of aging heat treatment and residual stress, applied in the fields of aging heat treatment, heat-treatable strengthening of aluminum alloy sheets, forgings and castings, to achieve the effect of reducing processing costs, improving machinability and overcoming technical difficulties

Active Publication Date: 2017-01-18
福建祥鑫股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires large press equipment to apply deformation in the thickness direction in addition to performing solution hardening twice.

Method used

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  • An aging heat treatment method to maintain the strength of aluminum alloy and reduce the quenching residual stress
  • An aging heat treatment method to maintain the strength of aluminum alloy and reduce the quenching residual stress
  • An aging heat treatment method to maintain the strength of aluminum alloy and reduce the quenching residual stress

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A heat treatment method for eliminating residual stress of aluminum alloy quenching, comprising the following steps:

[0029] 1. Take a 10mm thick 7150 aluminum alloy sheet, and its composition is shown in Table 1 (mass percentage, %):

[0030] Table 1

[0031]

[0032] 2. Preparation of aluminum alloy samples: take industrial hot-rolled aluminum alloy plates and cut them to a size of 10mm × 40mm × 80mm. The sample numbers are A / B / C / D / E / F / G / H, of which sample A / B / C / D / E are processed by the process of the present invention, and samples F / G / H are processed by the traditional process.

[0033] 3. Heat the samples A / B / C / D / E / F / G / H to 475°C for solution quenching, clean the surface, and use the punching method to measure the initial residual stress. The specific values ​​are shown in Table 2.

[0034] 4. Samples A / B / C were heated in a resistance furnace. The heating temperature of the aging treatment was 120 °C, 150 °C and 180 °C, respectively, and the holding time was ...

Embodiment 2

[0046] 1. Take a 7085 aluminum alloy plate with a thickness of 40mm, and its composition is shown in Table 3 (mass percentage, %):

[0047] table 3

[0048]

[0049] 2. Aluminum alloy sample preparation: get industrial hot rolled 7085 aluminum alloy plate, cut to size 40mm×160mm×160mm, sample number is I / J, wherein sample I is processed by the process of the present invention, and sample J is processed by traditional technology.

[0050] 3. Heat the sample I / J to 475°C for solution quenching, clean the surface, and use the punching method to measure the initial surface residual stress. The specific values ​​are shown in Table 4.

[0051] 4. Sample 1 was heated with a resistance furnace, and the heating temperature was 180° C., and the holding time was 20 min. After that, the sample was placed in the air for natural cooling, and after being cooled to room temperature, it was heated again, and the above process was repeated 8 times. After repeating the aging treatment for 1,...

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Abstract

The invention relates to an ageing heat treatment method for keeping aluminum alloy strength and reducing quenching residual stress. The ageing heat treatment method comprises the following steps: directly carrying out primary artificial aging on dissolved and quenched aluminum alloy, and carrying out secondary artificial aging, wherein the primary artificial aging means carrying out short-term artificial aging on aluminum alloy for at least three times, discharging and carrying out air cooling; improving the short-term artificial aging heating rate each time to obtain a temperature field which is opposite to the quenching process, so as to generate a stress field which is opposite to the quenching state to offset the residual stress, so that the effect of significantly reducing the residual stress is reached; and the mechanical property of the alloy is not affected. The ageing heat treatment method is suitable for forgings and planks with relatively large thicknesses and sizes and regular shapes; the method provided by the invention is simple in equipment, easy to operate and realize; and the residual stress can be obviously reduced under the premise that the mechanical property of the aluminum alloy is not affected.

Description

technical field [0001] The invention relates to an aging heat treatment method for maintaining the strength of an aluminum alloy and reducing the residual stress of quenching, which is suitable for heat-treatable strengthening aluminum alloy plates, forgings and castings. It belongs to the technical field of metal heat treatment. Background technique [0002] Heat-treatable aluminum alloys have the characteristics of high strength, corrosion resistance, good processing performance and welding performance, and are widely used in high-tech fields such as aerospace, aviation and transportation. For heat-treatable aluminum alloys, quenching can obtain a supersaturated solid solution in preparation for the next step of aging strengthening. In order to avoid the decomposition of the supersaturated solid solution, it is necessary to ensure a sufficient cooling rate during quenching. However, for aluminum alloy sheets and forgings with large size, especially thick, cooling too fas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/04C21D11/00
Inventor 张辉孙轶山蒋福林袁武华
Owner 福建祥鑫股份有限公司