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Metal surface laser processing method in liquid medium

A laser processing method and liquid medium technology, applied in the field of advanced manufacturing, can solve problems such as drop, excessive thermal stress on the surface of materials, surface properties of cracked materials, etc., achieve excellent surface properties, fine structure in the treatment area, and improve component supercooling Effect

Inactive Publication Date: 2012-10-17
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] c) Deterioration of material surface performance due to defects such as excessive thermal stress and cracks on the surface of the material after treatment

Method used

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  • Metal surface laser processing method in liquid medium
  • Metal surface laser processing method in liquid medium
  • Metal surface laser processing method in liquid medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Cooling speed of the laser treatment area of ​​vermicular graphite cast iron with different water film thicknesses under air and still water medium.

[0040] use figure 2 The components and procedures shown are used to prepare the laser surface under the water film medium, and the sample prepared under the air medium is selected as a reference sample. The material of the test piece is vermicular graphite cast iron, and the size of the test piece is 20×10×10mm 3 ; Laser parameters are: pulse frequency 3Hz, pulse width 5ms, laser single pulse energy 71J, spot diameter 0.7mm, defocus 5mm. The types of treatment specimens are: air medium treatment, 1mm, 2mm and 3mm water film medium treatment. The temperature of the aqueous medium was room temperature 25°C. Combined with the microstructure characteristics of the treatment area of ​​each specimen processed under different conditions, the cooling rate of the treatment area under different processing media and m...

Embodiment 2

[0041] Example 2: Effects of laser treatment of GCr15 bearing steel with different water film thicknesses in air medium and flowing water medium.

[0042] use figure 2 The components and procedures shown are used to prepare the laser surface under the water film medium, and the sample prepared under the air medium is selected as a reference sample. The chemical composition (percentage) of the test piece GCr15 bearing steel is: C 0.95, Si 0.2, Mn 0.3, Cr 1.35, P3 ; The laser parameters are: the pulse frequency is 1Hz, the pulse width is 5ms, the input single pulse energy is 78J, the spot diameter is 0.7mm, and the defocus is 5mm. The thickness of the water film was set to 1 mm, 2 mm, and 3 mm respectively; the water flow rate was 0.5 mm / s; the temperature of the water medium was room temperature 25°C.

[0043] FEI XL-30FEG ESEM field emission scanning electron microscope was used to observe the surface morphology of the treated specimens a (1mm water film), b (2mm water film)...

Embodiment 3

[0045] Example 3: Friction and wear properties of laser-treated vermicular graphite cast iron surfaces with different water film thicknesses in air medium and static water medium.

[0046] use figure 2 The components and procedures shown are used to prepare the laser surface under the water film medium, and the sample prepared under the air medium is selected as a reference sample. The chemical composition (percentage) of the test piece vermicular graphite cast iron (CGI) is: C 3.56, Si 2.56, Mn 0.75, P0.03, S 0.03, Re 0.02, Mg 0.02. The standard specimen size of compacted graphite cast iron (CGI) is 20×10×10mm 3 ; The laser parameters are: the pulse frequency is 1Hz, the pulse width is 5ms, the input single pulse energy is 71J, the spot diameter is 0.7mm, and the defocus is 5mm. The thickness of the water film is 1mm, 2mm and 3mm respectively; the water film is in a static state; the temperature of the water medium is room temperature 25°C.

[0047] The friction and wear ...

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Abstract

The invention relates to a laser surface processing method of a part and a test piece in a liquid medium, especially to a metal surface laser processing method in a liquid medium with excellent treatment structure and special surface performance by the utilization of a laser preparation means. The concrete implementation process is as follows: the part or test piece is immersed in a container filled with some liquid, and a laser terminal permeates through a liquid water film on the surface of the part or test piece and irradiates on the surface of the test piece or part to be processed. Different requirements for processing the part or test piece can be realized through adjusting height of liquid level, speed of liquid flow and temperature. The method can be used as a method for optimizing laser processing structures and also can be used to preheat the part or test piece to be processed, so as to obtain ideal surface mechanical properties and special functions.

Description

technical field [0001] The invention relates to the field of advanced manufacturing technology for laser preparation under special conditions, in particular to a method for obtaining an excellent treatment zone structure and special surface properties by means of laser preparation under a liquid medium. technical background [0002] Laser is one of the greatest inventions of mankind in the 20th century. Since the first ruby ​​laser came out in the United States in 1960, the research on laser technology and its application has been a hot research topic at home and abroad. As a kind of light amplified by stimulated radiation, laser has the characteristics of high brightness, high directionality, high monochromaticity, high coherence, special spatial distribution, time control, polarization characteristics, etc. It is widely used in manufacturing, measurement, medicine, It is widely used in communication, transportation, energy, environment, education and other industries. Las...

Claims

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Application Information

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IPC IPC(8): C21D1/09
Inventor 张志辉任露泉王亮周宏张宝玉常芳杨肖
Owner JILIN UNIV
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