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Embossed laser beam implementation method and device for reducing cracks on cladding layer

A technology of laser beam and implementation method, applied in optics, coatings, optical components, etc., can solve the problems of poor versatility, increased complexity of laser cladding system, low control accuracy, etc., to reduce temperature gradient and reduce cracking tendency , the effect of small thermal stress

Inactive Publication Date: 2013-09-18
TONGLING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the special insulation box should be specially designed and manufactured according to different cladding samples, which has poor versatility; and remote sensing infrared rays or flame spray guns are external heat sources, which will increase the complexity of the entire laser cladding system, and its control accuracy is low.

Method used

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  • Embossed laser beam implementation method and device for reducing cracks on cladding layer
  • Embossed laser beam implementation method and device for reducing cracks on cladding layer

Examples

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Effect test

Embodiment 1

[0032] Preparation of NiCr-50%Cr on the surface of TC4 titanium alloy (Ti-6Al-4V) using a convex laser beam that can reduce cladding layer cracks 3 C 2 Coating, its specific steps are:

[0033]① Grinding, degreasing and sandblasting the surface of the TC4 titanium alloy substrate that has been wire-cut to a certain size;

[0034] ② Use the research body to mix NiCr and Cr with a ratio (mass fraction) of 1:1 3 C 2 The powder is ground and mixed, and the mixed powder is made into a paste with the binder cellulose ether, and evenly coated on the surface of the TC4 titanium alloy sample to be clad, the preset coating thickness is about 1.5mm;

[0035] ③A laser beam splitter 2 with a fixed beam splitting ratio is used to split the laser beam emitted by the laser 1 into two laser beams L 1 , L 2 , the laser beam L 1 , L 2 Respectively reflected by the laser total reflection mirror 3, 4 to the flat-top laser beam shaping element 5, 6 to complete the transformation of the laser...

Embodiment 2

[0038] The NiCr-50%WC coating is prepared on the surface of the TiAl alloy substrate using a convex laser beam that can reduce cracks in the cladding layer. The specific steps are:

[0039] ① The surface of the TiAl alloy substrate is ground, degreased and sandblasted by WEDM to a certain size;

[0040] ② Grind and mix NiCr and WC powder with a ratio (mass fraction) of 1:1 with a grinder, make the mixed powder into a paste with binder cellulose ether, and apply it evenly on the surface of the TiAl alloy sample to be clad , the preset coating thickness is about 1.5mm;

[0041] ③A laser beam splitter 2 with a fixed beam splitting ratio is used to split the laser beam emitted by the laser 1 into two laser beams L 1 , L 2 , the laser beam L 1 , L 2 Respectively reflected by the laser total reflection mirror 3, 4 to the flat-top laser beam shaping element 5, 6 to complete the transformation of the laser power density, transforming it into two beams with a large size and a small...

Embodiment 3

[0044] Preparation of MCrAlY-5%Al on the surface of GH4033 nickel-based superalloy substrate using a convex laser beam that can reduce cladding layer cracks 2 o 3 Composite coating, its specific steps are:

[0045] ① Grinding, degreasing and sandblasting the surface of the GH4033 nickel-based superalloy substrate that has been wire-cut to a certain size;

[0046] ② Use the research body to mix MCrAlY and Al with a ratio (mass fraction) of 19:1 2 o 3 The powder is ground and mixed, and the mixed powder is made into a paste with the binder cellulose ether, and evenly coated on the surface of the GH4033 nickel-based superalloy sample to be clad, the preset coating thickness is about 1.5mm;

[0047] ③A laser beam splitter 2 with a fixed beam splitting ratio is used to split the laser beam emitted by the laser 1 into two laser beams L 1 , L 2 , the laser beam L 1 , L 2 Respectively reflected by the laser total reflection mirror 3, 4 to the flat-top laser beam shaping element...

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Abstract

The invention provides an embossed laser beam implementation method for reducing cracks on a cladding layer. The embossed laser beam implementation method comprises the following steps of: 1, dividing a laser beam L emitted by a laser device into two laser beams L1 and L2 by a laser beam splitter; 2, reflecting the laser beams L1 and L2 to a laser beam shaping element respectively through laser full reflectors to finish light intensity distribution conversion; and 3, combining the two converted light beams by a laser beam combiner to obtain a required embossed light beam in laser power density distribution, and applying the light beam to the surface of a pretreated cladding test piece so as to realize cladding process. The invention also provides an embossed laser beam implementation device for reducing the cracks on the cladding layer. The embossed laser beam implementation method and device for reducing cracks on the cladding layer have the technical effects that the size and the power density distribution of the finally output embossed laser beam can be conveniently controlled; the laser cladding is executed by the embossed light beam, so that preheating and slow cooling effects can be achieved; the cracking tendency of the cladding layer can be effectively reduced.

Description

Technical field: [0001] The present invention relates to a laser beam conversion method and device, in particular to a method and device for controlling cracks in laser cladding layers by changing the distribution of laser power density, in particular to a convex laser beam that reduces cracks in cladding layers Implementation methods and devices. Background technique: [0002] Laser cladding is an important material surface strengthening and processing technology, which uses high power density laser beams (10 4 ~10 6 W / cm 2 ) is irradiated on the metal surface, through rapid melting, expansion and rapid solidification (cooling rate usually reaches 10 2 ~10 6 ℃ / s), forming a metallurgically bonded material with special physical, chemical or mechanical properties on the surface of the base material, thereby significantly improving the wear resistance, corrosion resistance, heat resistance, and oxidation resistance of the base surface. It has broad application prospects i...

Claims

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Application Information

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IPC IPC(8): C23C24/10G02B27/10
Inventor 王东生田宗军杨友文周杏花沈理达黄因慧
Owner TONGLING UNIV
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