Method for preparing gradient nano-structure on surface of high-strength high-hardness metal material

A metal material, surface gradient technology, applied in the field of material surface treatment, can solve the problem of low hardness and achieve the effect of low processing cost, increased thickness and increased depth
CN107119183AActive Publication Date: 2017-09-01CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (EAST CHINA)
Publication Date
2017-09-01

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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.
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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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