Method for surface nano-crystallization and structure stabilization of metal material

A metal material, nanotechnology, applied in nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve problems such as grain growth, achieve stable surface performance, low energy consumption, and high efficiency Effect

Inactive Publication Date: 2015-01-14
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of method of metal material surface nanometerization and structure stabilization thereof, this method can prepare nanocrystalline layer on the surface of metal material, and solve this nano layer in the subsequent cold and hot processing process. The problem of grain growth occurs, which improves the stability of the nanocrystalline structure and properties on the surface of metal materials, and expands the scope of use of metal materials

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  • Method for surface nano-crystallization and structure stabilization of metal material
  • Method for surface nano-crystallization and structure stabilization of metal material
  • Method for surface nano-crystallization and structure stabilization of metal material

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) The pure copper sheet is used for stress relief annealing treatment. The length, width and thickness of the sheet are 100 mm × 100 mm × 10 mm, the annealing temperature is 250 °C, and the holding time is 0.5 h to remove the residual internal stress in the previous machining. ;

[0027] (2) Fix the pretreated pure copper sheet on the top of the grinding tank of the surface mechanical attrition treatment (SMAT for short), the tank is in a vacuum state, and a large number of steel balls are installed. The material of the steel balls is GCr15, The diameter of the steel ball is 12 mm; when the machine is started, the surface of the material is repeatedly hit with high frequency to carry out surface grinding treatment. The surface nanoization treatment time is 30 minutes, and the vibration frequency of the system is 100 Hz; side organization as figure 1 As shown in the figure, 1 is the surface nanocrystalline layer of copper, 2 is the fine-grained and ultra-fine-grained ...

Embodiment 2

[0032] (1) Use pure copper sheet for stress relief annealing, the length, width and thickness of the sheet are 50 mm × 50 mm × 2 mm, the annealing temperature is 200 °C, and the holding time is 5 h to remove the residual internal stress in the previous machining;

[0033] (2) Fix the pretreated copper plate sample on the top of the grinding tank with surface mechanical attrition treatment (SMAT for short), the tank is in an argon atmosphere, and a large number of steel balls are installed, and the material of the steel balls is GCr15 , the diameter of the steel ball is 8 mm. When the machine is started, the surface of the material is repeatedly hit with high frequency to carry out surface grinding treatment. The surface nanoization treatment time is 90 min, and the system vibration frequency is 50 Hz; The average grain size of the nanocrystalline layer is about 60 nm, and the layer thickness is about 55 μm.

[0034] (3) Perform stress relief annealing on the surface mechanical...

Embodiment 3

[0038] (1) The pure copper sheet is used for stress relief annealing treatment. The length, width and thickness of the sheet are 60 mm × 70 mm × 4 mm, the annealing temperature is 180 °C, and the holding time is 10 h to remove the residual internal stress in the previous machining. ;

[0039] (2) Fix the pretreated copper plate sample on the top of the grinding tank with surface mechanical attrition treatment (SMAT for short), the tank is in a vacuum state, and a large number of steel balls are installed. The material of the steel balls is GCr15, The diameter of the steel ball is 4 mm. When the machine is started, the surface of the material is repeatedly hit with high frequency to carry out surface grinding treatment. The surface nanoization treatment time is 180 min, and the system vibration frequency is 20 Hz; The average grain size is about 70 nm, and the nanolayer thickness is about 45 μm;

[0040] (3) Perform stress relief annealing on the surface mechanically ground pu...

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Abstract

The invention discloses a method for surface nano-crystallization and structure stabilization of a metal material and belongs to the technical field of surface treatment of materials. The method disclosed by the invention comprises the following steps: by taking the metal material as an object, firstly performing stress relief annealing pretreatment to remove internal stress left by a previous machining process; then putting into a surface mechanical grinding device under vacuum conditions, and repeatedly hitting the surface of the material at high frequency by utilizing a large number of steel balls to perform surface nano-crystallization treatment; further performing pressure relief annealing treatment to remove the internal stress produced in the mechanical grinding treatment; and finally performing high-energy ion injection on the material after surface nano-crystallization to obtain the metal material with a stable surface nano-layer. According to the method disclosed by the invention, the surface mechanical grinding is combined with the high-energy ion injection, so that the nano-layer can be prepared on the surface of the metal material, the nano-layer has good stability in the subsequent cold and hot processing, and thus the stability of the mechanical properties of the surface of the material can be kept; in addition, the method disclosed by the invention is simple in process, low in investment, high in efficiency, low in energy consumption, pollution-free and easy to realize industrial production.

Description

technical field [0001] The invention relates to a method for surface nanometerization of metal materials and its structure stabilization, and belongs to the technical field of material surface treatment. Background technique [0002] With the rapid development of today's science and technology, the requirements of modern industry for the properties of metal materials, especially the surface properties, are increasing day by day. It has been pointed out in many literatures and cases that the instability of most materials starts from their surfaces. Considering the unique and excellent properties of nanomaterials, the method of preparing nanocrystals on their surfaces can be used to optimize their properties and environmental service behavior. The method of preparing nanocrystals on the surface of metal materials by mechanical means (that is, surface nanometerization) is an important means to improve the surface properties of metal materials. After years of research and devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00C23C14/48C23F17/00B82Y40/00B82Y30/00
Inventor 李才巨郗旸张淇萱袁倩
Owner KUNMING UNIV OF SCI & TECH
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