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Laser plasma shock wave surface nanocrystallization method for polycrystal metal material

A laser plasma and metal material technology, applied in the field of surface engineering technology and laser processing, can solve the problems of nanotechnology that have not been reported, and achieve the effects of easy control, small deformation of the workpiece, and high work efficiency

Inactive Publication Date: 2011-09-28
AIR FORCE UNIV PLA
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AI Technical Summary

Problems solved by technology

There is no relevant report on the self-nanometerization technology of the large and complex metal material surface that can be used in industrial applications

Method used

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  • Laser plasma shock wave surface nanocrystallization method for polycrystal metal material
  • Laser plasma shock wave surface nanocrystallization method for polycrystal metal material
  • Laser plasma shock wave surface nanocrystallization method for polycrystal metal material

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] In this embodiment, a 20 nanosecond laser is used to process the titanium alloy (Ti-6.5Al-3.3Mo-1.5Zr-0.25Si) specimen, and the specific implementation steps are:

[0032] Step 1: Paste black tape on the surface of the Ti-6.5Al-3.3Mo-1.5Zr-0.25Si titanium alloy specimen to be processed. The thickness of the laser absorption layer is 0.1mm; see figure 1

[0033] Step 2: Using flowing water medium to form a 1mm thick water-constrained layer on the surface of the material to be processed;

[0034] Step 3: Adjust the incident angle between the laser and the surface of the material to be processed to 0 degrees, and set the laser power density to 2.86GW / cm 2 , select the laser pulse magnitude as 20 nanoseconds;

[0035] Step 4: The laser performs 3 impact treatments on the surface of the material to be processed with a repetition frequency of 10 Hz ...

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Abstract

The invention relates to a laser plasma shock wave surface nanocrystallization method for a polycrystal metal material, which is characterized in that: a target is irradiated by a strong laser with high power density (> 1 GW / cm<2>) and short pulse (femtosecond, picosecond and nanosecond) to generate a high-pressure plasma shock wave, the high-pressure plasma shock wave acts on the surfaces of a component, a high-strain-rate dynamic deformation of a material is caused by the shock wave during the propagation process inside the material, and nanocrystals are formed on the surfaces of the component under the lapping and multiple actions of the shock wave with a pressure higher than a certain threshold value. The invention is applicable to any components of polycrystal metal, and the combination of laser plasma shock wave surface nanocrystallization and residual compressive stress intensifying mechanism can improve anti-fatigue, wear-resistant and other properties of the component, and overcomes the defects that the residual compressive stress is relaxed in a high-temperature environment and has low intensifying effect.

Description

technical field [0001] The invention relates to the fields of surface engineering technology and laser processing, in particular to a processing method for realizing nanometerization of the surface of metal materials by utilizing laser plasma shock waves. Background technique [0002] Since the maximum stress generally occurs on the surface of the component, and the surface has the most defects, fatigue cracks often start from the surface of the component. Therefore, the state of the surface layer of the metal component has a significant impact on the fatigue strength. In the world, the method of surface strengthening is generally used to improve the fatigue strength of components and prolong the service life. [0003] Commonly used surface strengthening methods, such as shot peening, low plasticity rolling, laser shock strengthening, etc., are based on the principle of introducing residual compressive stress on the surface of the component to generate dislocations, thereby ...

Claims

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Application Information

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IPC IPC(8): C21D1/09B82Y40/00B82Y30/00
Inventor 李应红何卫锋周鑫李玉琴安志斌汪诚
Owner AIR FORCE UNIV PLA
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