Manufacturing method of surface nanometer gradient layer of metal material

A technology of metal materials and gradient layers, which is applied in the field of surface strengthening and modification of metal materials, can solve the problems of unsuitable surface treatment of large-sized metal parts, large surface roughness of products, and restrictions on further application, etc., to achieve convenient manufacturing and maintenance , simple process and wide application range

Inactive Publication Date: 2017-12-01
XIAN UNIV OF TECH
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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 As shown in (b); but this method needs to be in a vacuum environment, and the size of the container also limits this method to laboratory research, and is not suitable for surface treatment of large-sized metal parts. In addition, the surface roughness of the product is very large , further restricting its further application in industry

Method used

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  • Manufacturing method of surface nanometer gradient layer of metal material
  • Manufacturing method of surface nanometer gradient layer of metal material
  • Manufacturing method of surface nanometer gradient layer of metal material

Examples

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Embodiment 1

[0033] 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 5) is reduced to 30nm of the nano-layer crystal grains, the TEM bright-field image of the nano-crystal and the corresponding selected electron diffraction patterns and dark-field images ar...

Embodiment 2

[0037] Differences from Example 1:

[0038] 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 12 , with a surface roughness of 6.879 μm.

[0039] 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...

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Abstract

The invention provides a method for preparing a nano-gradient layer on the surface of a metal material. The surface of a metal material sample is ground and polished; 50μm nano-layer, the average size of the surface nano-grains is not greater than 50nm, the surface roughness is greater than 3μm, and the surface microhardness is greater than 250HV; then the surface of the metal material sample is mechanically rolled; The surface of the sample is treated to finally reduce the surface roughness of the material to 0.01-0.2 μm, and the surface microhardness is greater than 300HV. The invention can greatly improve the surface roughness of the metal material after surface nanometerization.

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): C21D7/06C21D7/04C22F1/00C22F1/04
CPCC21D7/06C21D7/04C22F1/00C22F1/04
Inventor 葛利玲杨建海高超逸加庆波张虎程晓陈青师
Owner XIAN UNIV OF TECH
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