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Alloy powder for high-hardness laser cladding and zero-defect cladding layer preparation method

A technology of laser cladding and alloy powder, which is applied in the coating process and coating of metal materials, can solve the problems that the hardness is difficult to reach HRC60, and achieve the effects of avoiding hot and cold cracks, inhibiting initiation and expansion, and reducing temperature difference

Inactive Publication Date: 2020-08-18
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current laser cladding alloy powder generally has a hardness of HRC60 and does not have any defects such as cracks and pores.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0025] The present invention also provides a method for preparing a defect-free cladding layer, using the above alloy powder for laser cladding with high hardness, comprising the following steps:

[0026] (1) Screen each component powder according to the percentage to form alloy powder, carry out vacuum smelting and gas atomization on the alloy powder, and then put it into a drying box, set the temperature at 150-180°C, and the drying time is 2-3 hours;

[0027] (2) The dried alloy powder in sealed packaging;

[0028] (3) The alloy powder for laser cladding is placed in the powder feeding cylinder of the laser cladding powder feeder, and the cladding layer can be obtained by feeding the powder by gravity for laser cladding.

[0029] Further, the cladding layer has a thickness of 1.8-2.2mm.

[0030] Further, the process parameters for laser cladding are: laser power: 3.5-3.8KW; rectangular spot: 2×14mm; lap rate: 30-50%; scanning speed: 350-450mm / min.

[0031] Further, the su...

Embodiment 1

[0033] The high-hardness alloy powder for laser cladding provided in this embodiment contains the following components:

[0034] C: 0.25% Si: 0.4%

[0035] Cr: 17% V: 1.5%

[0036] Mo: 0.08% Ni: 2.5%

[0037] Fe: margin

[0038] Further, each component adopts a powder with a purity greater than 99%, and the particle size is: 135-325 mesh.

[0039] The high-hardness alloy powder for laser cladding described in this embodiment is prepared for a defect-free cladding layer according to the following steps:

[0040] (1) Screen the powders of each component according to the percentage to prepare alloy powder, put the alloy powder into a drying box after vacuum melting and gas atomization, set the temperature at 150°C, and the drying time is 2 hours;

[0041] (2) The dried alloy powder in sealed packaging;

[0042] (3) Preheat the base material to 200°C before laser cladding, place the alloy powder for laser cladding in the powder feeding cylinder of the laser cladding powder fe...

Embodiment 2

[0044] The high-hardness alloy powder for laser cladding provided in this embodiment contains the following components:

[0045] C: 0.55% Si: 0.6%

[0046] Cr: 19% V: 2.5%

[0047] Mo: 0.15% Ni: 3.3%

[0048] Fe: margin

[0049] Further, each component adopts a powder with a purity greater than 99%, and the particle size is: 135-325 mesh.

[0050] The high-hardness alloy powder for laser cladding described in this embodiment is prepared for a defect-free cladding layer according to the following steps:

[0051] (1) Screen each component powder according to the percentage to form alloy powder, put the alloy powder into a drying box after vacuum smelting and gas atomization, set the temperature at 180°C, and the drying time is 3 hours;

[0052] (2) The dried alloy powder in sealed packaging;

[0053](3) Preheat the base material to 250°C before laser cladding, place the alloy powder for laser cladding in the powder feeding cylinder of the laser cladding powder feeder, and c...

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Abstract

The invention provides alloy powder for high-hardness laser cladding and a zero-defect cladding layer preparation method. The alloy powder comprises the following components: by mass, 0.25-0.55% of C,0.4-0.6% of Si, 17-19% of Cr, 1.5-2.5% of V, 0.08-0.15% of Mo, 2.5-3.3% of Ni, and the balance Fe. The cladding layer preparation method comprises the following steps of (1) screening the componentsby percentage, preparing the alloy powder, conducting vacuum melting and gas atomization on the alloy powder and then placing the alloy powder into a drying box; (2) hermetically packaging the dried alloy powder; and (3) feeding the alloy powder for laser cladding in a powder feed drum of a laser cladding powder feeder, and conducting laser cladding through gravity powder feeding to obtain the cladding layer. Through the technical scheme, after laser cladding processing, the alloy powder and a base material can form the zero-defect cladding layer a base material with the good metallurgical bonding performance. The surface and the cross section of the cladding layer have no defects such as cracks and pores, and the use requirement for high hardness and zero defect of the laser cladding layer is met.

Description

technical field [0001] The invention relates to the field of metal surface engineering, in particular to an alloy powder for high-hardness laser cladding and a method for preparing a defect-free cladding layer. Background technique [0002] Laser cladding refers to the melting of alloy powder, alloy welding wire, etc. by laser scanning, and a metallurgical reaction with the molten layer on the surface of the substrate in a very short period of time to obtain a surface cladding layer with a very low dilution and a metallurgical combination with the substrate, which significantly improves The technological method of wear resistance, corrosion resistance, heat resistance and other properties of the surface of the base layer, so as to achieve the purpose of surface modification or repair. The current laser cladding alloy powder generally has a hardness of up to HRC60 and does not have any defects such as cracks and pores. Because of the development of high hardness alloy powder...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C38/46C22C38/44C22C38/02B22F1/00
CPCB22F1/0003C22C38/02C22C38/44C22C38/46C23C24/103
Inventor 付宇明刘绍峰郑丽娟付晨
Owner YANSHAN UNIV
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