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Technological method for improving thermal fatigue performance of aluminum alloy material

A technology of aluminum alloy material and process method, applied in the direction of metal material coating process, coating, etc., can solve the problem that the cladding layer is easy to fall off, affects the improvement of the thermal fatigue performance of the aluminum alloy, and affects the effect of the laser cladding layer on the aluminum alloy. surface strengthening and other issues, to expand the application field and improve the thermal fatigue performance.

Active Publication Date: 2019-03-29
NANJING LONGHAO NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These problems have seriously affected the strengthening effect of the laser cladding layer on the aluminum alloy surface, and the cladding layer is easy to fall off during the thermal fatigue process, which seriously affects its effect on improving the thermal fatigue performance of aluminum alloys.

Method used

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  • Technological method for improving thermal fatigue performance of aluminum alloy material
  • Technological method for improving thermal fatigue performance of aluminum alloy material
  • Technological method for improving thermal fatigue performance of aluminum alloy material

Examples

Experimental program
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Effect test

Embodiment 1

[0026]The aluminum alloy is selected from commercially available A356 cast aluminum alloy. The strengthening treatment is carried out according to the following steps: step (1): blackening treatment on the surface of the aluminum alloy. First sanded and polished, then immersed in 8% NaOH solution and etched for 3 min to remove the surface Al 2 o 3 Contaminants such as films and other oil stains are finally cleaned with alcohol and then air-dried for later use; step (2): preparation of cladding powder. The chemical composition of Ni-based powder is calculated by mass percentage, Cr is 13%, Si is 3%, Ti is 2%, B is 2%, Y 2 o 3 3%, CeO 2 3%, La 2 o 3 2%, Nd 2 o 3 is 1%, Co is 1%, C is 0.5%, Mn is 0.5%, SrO is 0.1%, Fe is 2%, and the balance is Ni. Grinding and mixing the above powder in a vacuum ball mill for 10 minutes, the particle size of the powder is 250-400 mesh, and the shape is spherical or nearly spherical; step (3): laser cladding process. The fiber laser is u...

Embodiment 2

[0029] The aluminum alloy is selected from commercially available A356 cast aluminum alloy. The strengthening treatment is carried out according to the following steps: step (1): blackening treatment on the surface of the aluminum alloy. First sanded and polished, and then immersed in 10% NaOH solution for 2 min to remove the surface Al 2 o 3 Contaminants such as films and other oil stains are finally cleaned with alcohol and then air-dried for later use; step (2): preparation of cladding powder. The chemical composition of Ni-based powder is calculated by mass percentage, Cr is 18%, Si is 5%, Ti is 3%, B is 3%, Y 2 o 3 4%, CeO 2 4%, La 2 o 3 3%, Nd 2 o 3 2%, Co 3%, C 0.8%, Mn 0.8%, SrO 0.3%, Fe 8%, and the balance Ni. Grinding and mixing the above powder in a vacuum ball mill for 30 minutes, the particle size of the powder is 150-300 mesh, and the shape is spherical or nearly spherical; step (3): laser cladding process. The fiber laser is used to carry out laser cla...

Embodiment 3

[0032] The aluminum alloy is selected from the commercially available 7075 deformed aluminum alloy. The strengthening treatment is carried out according to the following steps: step (1): blackening treatment on the surface of the aluminum alloy. First sanded and polished, then immersed in 8% NaOH solution and etched for 3 min to remove the surface Al 2 o 3 Contaminants such as films and other oil stains are finally cleaned with alcohol and then air-dried for later use; step (2): preparation of cladding powder. The chemical composition of Ni-based powder is calculated by mass percentage, Cr is 13%, Si is 3%, Ti is 2%, B is 2%, Y 2 o 3 3%, CeO 2 3%, La 2 o 3 2%, Nd 2 o 3 1%, Co 1%, C 0.5%, Mn 0.5%, SrO 0.1%, Fe 2%, and the balance Ni. Grinding and mixing the above powder in a vacuum ball mill for 10 minutes, the particle size of the powder is 250-400 mesh, and the shape is spherical or nearly spherical; step (3): laser cladding process. The fiber laser is used to carry...

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Abstract

The invention provides a technical method for improving the thermal fatigue performance of the aluminum alloy material, belongs to the technical field of aluminum alloy performance enhancement. The method comprises the following steps of firstly carrying out laser cladding treatment process on an aluminum alloy, wherein the first step comprises the following steps of (1) blackening the surface ofthe aluminum alloy so as to remove pollutants such as Al2o3 thin films on the surface and other oil stains; (2) preparing the self-made Ni matrix cladding powder, wherein the powder is ground and mixed in a vacuum ball mill for 10-30 minutes, the granularity of the powder is 150-400 meshes, and the shape of the powder is spherical or nearly spherical; (3) carrying out the laser cladding process ina coaxial powder feeding mode under the protection atmosphere of argon by using a fiber laser; secondly carrying out solid solution treatment, cryogenic treatment and aging treatment to the aluminumalloy subjected to laser cladding treatment to obtain the aluminum alloy material with remarkably improved thermal fatigue performance through the above process.

Description

technical field [0001] The invention relates to a process method for improving the thermal fatigue performance of aluminum alloy materials, in particular to a process method suitable for coordinated strengthening of laser cladding treatment and solid solution cryogenic aging composite treatment to improve the thermal fatigue performance of aluminum alloy materials. Background technique [0002] In recent years, aluminum alloys are prone to thermal fatigue failure in the application process of aerospace and other high-end fields. The so-called thermal fatigue refers to an important failure mode of materials in service under alternating temperature or thermal cycle environment. In real life, non-room temperature working equipment will continue to withstand the combined effects of thermal stress, tensile and compressive stress, and high-temperature oxidation and corrosion during steady-state operation, start-up and shutdown, or sudden changes in working conditions, resulting in...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22F1/04C23F17/00
CPCC22F1/04C23C24/103C23F17/00
Inventor 刘光磊魏笑庄栋栋陈金豪孙婕刘海霞
Owner NANJING LONGHAO NEW MATERIAL TECH CO LTD
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