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Metal material surface strengthening method based on mixed surface nanocrystallization technology

A metal material and surface strengthening technology, applied in the field of surface strengthening and modification of metal materials, can solve the problems of limited application, unsuitable surface treatment of large-sized metal parts, large surface roughness of products, etc. Easy maintenance and wide application

Inactive Publication Date: 2017-07-07
ROCKET FORCE UNIV OF ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When working, the projectile collides with the sample randomly from all directions with a large energy, so that the surface of the material is nano-sized through strong plastic deformation, and the surface of the material forms a nanostructure layer. The strain and strain of the material increase with the distance from the surface. The rate decreases along the gradient, such as figure 1 (b); but this method needs to be in a vacuum environment, and the size of the container also limits this method to be only suitable for laboratory research, and is not suitable for carrying out surface treatment to large-sized metal parts, in addition, the product surface roughness is very big, further Limiting its further application in industry

Method used

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  • Metal material surface strengthening method based on mixed surface nanocrystallization technology
  • Metal material surface strengthening method based on mixed surface nanocrystallization technology
  • Metal material surface strengthening method based on mixed surface nanocrystallization technology

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Embodiment 1

[0028] The present invention takes 2A14 aluminum alloy as processing object, 2A14 is Al-Mg-Si-Cu alloy, processes aluminum alloy plate of 500mm×500mm×5mm, and performs conventional grinding and polishing treatment on the surface of the sample. Use 1433 / 8558Progressive (DT1480) CNC shot peening machine to carry out supersonic particle bombardment surface treatment on aluminum alloy. The main parameters are: the projectile material is stainless steel S110, the projectile diameter is 0.3mm, the spray angle is 90°, the working pressure is 0.53MPa, and the airflow rate is 1200m / s, spray distance 130mm, spray time 10min. After the treatment, a nanolayer about 50 μm thick is formed on the surface of the material, and the surface crystal grains are formed by the 30 μm of the matrix (such as Figure 4 ) is reduced to 30nm of the nano-layer grain, the TEM bright field image of the surface nano-layer grain and the corresponding selected electron diffraction pattern and dark field image ...

Embodiment 2

[0031] Differences from Case 1:

[0032] Use 1433 / 8558Progressive (DT1480) CNC shot peening machine to carry out supersonic particle bombardment surface treatment on aluminum alloy. The main parameters are: the projectile material is WC, the projectile diameter is 0.5mm, the working pressure is 0.4MPa, and the spraying time is 20min. After the treatment, a layer of about 50 μm thick nano-layer is formed on the surface of the material, and the average grain size of the nano-layer on the surface is 50 nm. Figure 10 , with a surface roughness of 6.879 μm.

[0033] After the supersonic particle bombardment technology is used to nano-treat the surface of 2A14 aluminum alloy, the surface of the material is continued to be processed by surface mechanical rolling equipment. The rotation speed of the rotating shaft is 40r / min, and the diameter of the roller is 45mm. The sample can move left and right at a speed of 0.5mm / s, and the sample is rolled 30 times in an air environment at 50°C...

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Abstract

The invention provides a metal material surface strengthening method based on the mixed surface nanocrystallization technology. The method comprises the steps that the surface of a metal material sample is ground and polished; supersonic speed microparticle bombardment surface nanocrystallization treatment is carried out, a nanometer layer with the thickness not smaller than 50 micrometers is formed on the surface of the base material to be welded, the average size of surface nanometer crystals is not larger than 50 nm, the surface roughness is larger than 3 micrometers, and the surface microhardness is larger than 250 HV; and the surface of the metal material sample is subjected to surface mechanical rolling. By means of the method, the surface roughness of the surface-nanocrystallized metal material can be greatly improved.

Description

technical field [0001] The invention relates to a method for preparing the mixed surface nanometerization of metal materials, which is used for surface strengthening and modification of metal materials. Background technique [0002] Metal materials may be in long-term contact with corrosive oxidants and reducing agents in a high-humidity environment during service. Since corrosion generally starts from the surface of the material, it is more costly to improve the corrosion resistance of the material through surface treatment than to develop a new material. and time advantage. As a means of surface strengthening, surface nanotechnology can form a nano-layer on the surface of the material. Its advantages are mainly that it does not change the shape and size of the material, the process is simple and easy, the cost is low, and there is no environmental pollution of the currently used anodizing process. question. At present, the most commonly used method for surface nanotechno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/00C21D7/04C21D7/06C22F1/04
CPCC22F1/00C21D7/04C21D7/06C22F1/04
Inventor 杨建海加庆波葛利玲程晓高杨樊星陈雷波
Owner ROCKET FORCE UNIV OF ENG
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