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A method for preparing a gradient nanostructure on the surface of a high-strength and high-hardness metal material

A metal material and surface gradient technology, applied in the field of material surface treatment, can solve problems such as low hardness, and achieve the effects of low processing cost, increased thickness, and simple and reliable method

Active Publication Date: 2018-08-14
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Application Information

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Problems solved by technology

However, the existing surface mechanical treatment methods are mainly used for metals with low hardness (hardness lower than HV300) and good plasticity such as pure iron, pure copper, pure nickel, pure titanium, stainless steel, magnesium alloy, aluminum alloy, titanium alloy, etc. Fabrication of material surface nanolayers

Method used

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  • A method for preparing a gradient nanostructure on the surface of a high-strength and high-hardness metal material
  • A method for preparing a gradient nanostructure on the surface of a high-strength and high-hardness metal material
  • A method for preparing a gradient nanostructure on the surface of a high-strength and high-hardness metal material

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Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with specific embodiments.

[0030] The invention provides a method for a gradient nanostructure on the surface of a high-strength and high-hardness metal material, comprising the following steps:

[0031] Step 1: Install the high-strength and high-hard metal material on the workbench 10, install the tool head, connect the tool head 11 and the workpiece 9 to the positive pole and the negative pole of the high instantaneous energy density pulse power supply 1 respectively, and pass the tool head 11 through The thread is connected to the output end of the ultrasonic transducer 12;

[0032] Step 2: Adjust the output pressure of the cylinder to 500-700N, keep the tool head 11 in good contact with the workpiece 9, turn on the high instantaneous energy density pulse power supply 1, the ultrasonic generator 2 and the nozzle 8, and the role of the tool head 11 in the ultrasonic generator 2 Do ultrasonic vib...

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Abstract

The invention discloses a method for preparing a gradient nano-structure on the surface of a high-strength high-hardness metal material. The method comprises the following steps: a tool head (11) and a workpiece (9) are correspondingly connected with the positive pole and the negative pole of a high-instantaneous-energy-density pulsed power supply (1); and favorable contact between the tool head (1) and the workpiece (9) is kept, the high-instantaneous-energy-density pulsed power supply (1), an ultrasonic generator (2) and a nozzle (8) are started up, and the tool head (11) performs ultrasonic vibration along a Z axis under the action of the ultrasonic generator (2) to start to perform high-instantaneous-energy-density electric impulse and ultrasonic combined treatment on the surface of the workpiece. An instantaneous high temperature and ultrasonic micromechanical impact combined function formed by electric impulses can greatly improve the local micro plasticity at processing points of such high-strength high-hardness metal materials as nickle-based high-temperature alloy, die steel and the like, and severe plastic deformation occurs at the processing points, so that the surface of the workpiece can be effectively nano-crystallized, and the average size of surface grains can be 30 nanometers or below.

Description

technical field [0001] The invention belongs to the field of material surface treatment, and in particular relates to a method for preparing a gradient nanostructure on the surface of a high-strength and high-hardness metal material. Background technique [0002] When the grain size on the surface of the metal material reaches the nanoscale (grain size <100nm), it will have excellent physical and chemical properties, which can significantly improve the comprehensive performance and life of its parts. [0003] At present, the methods commonly used at home and abroad to nanometerize the surface of metal materials mainly include laser shock method and surface mechanical treatment method. The laser shock method uses the mechanical effect of the high instantaneous energy density laser shock wave to form a large value of residual compressive stress and microstructure changes on the surface of the metal material, so that nano-grains can be obtained on the surface. However, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D10/00C22F3/00
CPCC21D10/00C22F3/00
Inventor 纪仁杰刘永红金辉杨泽林张川张凡蔡宝平李小朋
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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