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

Abstract

The invention discloses a preparing device of a high-strength high-hardness metal material surface gradient nanostructure. A workpiece (9) made of a high-strength high-hardness metal material is mounted on a worktable (10), the worktable (10) can move in the X-axis and Y-axis direction of a machine tool, and therefore the workpiece (9) can be driven to move in the X-axis and Y-axis direction of the machine tool; a tool head (11) and the workpiece (9) are connected with a positive electrode and a negative electrode of a high instantaneous energy density pulse power source (1) correspondingly, the tool head (11) is connected to the output end of an ultrasonic energy converter (12), the tool head (11) does ultrasonic vibration along Z axis under the effect of an ultrasonic generator (2), the instantaneous high temperature and ultrasonic micro mechanical impact composite effect formed by electric pulses enables local micro plasticity of treatment points of a nickel-based high-temperature alloy, mold steel and other high-strength high-hardness metal materials to be greatly improved, the treatment points generate strong plastic deformation, the workpiece surface can be subject to effective nanocrystallization, and the surface average grain size can be below 30 nanometers.

Description

technical field [0001] The invention belongs to the field of material surface treatment, in particular to a device 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 nanocrystall...

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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

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