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Laser cladding method for improving surface performance of magnesium alloy AZ91D

A technology of surface performance and laser cladding, applied in the field of alloy powder liquid forming, can solve the problems of difficulty in preparation cost and performance to meet the needs of actual use, limited application of magnesium alloys, poor corrosion resistance, etc., and achieves high hardness and low cost. , combined with a strong effect

Inactive Publication Date: 2013-05-08
SUZHOU TIANHONG LASER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shortcomings of magnesium alloys such as low surface hardness, wear resistance, and poor corrosion resistance limit the application of magnesium alloys.
In practical applications, a surface coating with high surface hardness, excellent wear resistance and corrosion resistance, a firm bond between the effective working layer and the substrate, a certain size and thickness, and low cost is required, while the surface modification of magnesium alloys in the prior art Technology, in terms of comprehensively improving the mechanical properties and electrochemical properties of materials, has defects in the bonding strength between the coating and the substrate
It is still difficult to meet the needs of actual use in terms of preparation cost and performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1, a laser cladding method for improving the surface properties of magnesium alloy AZ91D according to the present invention is characterized in that it includes the following steps:

[0015] 1. The cladding material is Co-Cr alloy powder, and WC is added as a strengthening phase. The mass fraction of Cr is 16%-20%, and it forms a solid solution with Co. The content of WC in the strengthening phase is 3.5%-4.5%. It is prepared by atomization method Spherical powder with a particle size of 90-110 microns;

[0016] 2. Surface pretreatment of magnesium alloy workpiece to obtain a clean surface;

[0017] 3. Magnesium alloy workpiece surface cladding, using a flexible laser processing system composed of fiber lasers, the beam mode is multi-mode, the pulse width is 6ms, the frequency is 6Hz, the spot diameter is 2.5mm, the focal length is 75mm, the scanning method is spiral scanning, and the scanning speed is 90mm / s, powder feeding amount 2g / s;

[0018] 4. Combin...

Embodiment 2

[0022] Embodiment 2, a laser cladding method for improving the surface properties of magnesium alloy AZ91D according to the present invention is characterized in that it includes the following steps:

[0023] 1. The cladding material is Co-Cr alloy powder, and WC is added as a strengthening phase. The mass fraction of Cr is 16%, and it forms a solid solution with Co. The content of WC in the strengthening phase is 3.5%. A spherical shape with a particle size of 90 microns is prepared by atomization method powder;

[0024] 2. Surface pretreatment of magnesium alloy workpiece to obtain a clean surface;

[0025] 3. Magnesium alloy workpiece surface cladding, using a flexible laser processing system composed of fiber lasers, the beam mode is multi-mode, the pulse width is 6ms, the frequency is 6Hz, the spot diameter is 2.5mm, the focal length is 75mm, the scanning method is spiral scanning, and the scanning speed is 90mm / s, powder feeding amount 2g / s;

[0026] 4. Combining the ...

Embodiment 3

[0028] Embodiment 3, a laser cladding method for improving the surface properties of magnesium alloy AZ91D according to the present invention is characterized in that it includes the following steps:

[0029] 1. The cladding material is Co-Cr alloy powder, and WC is added as a strengthening phase. The mass fraction of Cr is 20%, and it forms a solid solution with Co. The content of WC in the strengthening phase is 4.5%. A spherical shape with a particle size of 110 microns is prepared by atomization. powder;

[0030] 2. Surface pretreatment of magnesium alloy workpiece to obtain a clean surface;

[0031] 3. Magnesium alloy workpiece surface cladding, using a flexible laser processing system composed of fiber lasers, the beam mode is multi-mode, the pulse width is 6ms, the frequency is 6Hz, the spot diameter is 2.5mm, the focal length is 75mm, the scanning method is spiral scanning, and the scanning speed is 90mm / s, powder feeding amount 2g / s;

[0032] 4. Combining the Co-Cr...

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Abstract

The invention provides a laser cladding method for improving the surface performance of magnesium alloy AZ91D. The method adopts Co-Cr alloy powder as a cladding material, and comprises the following steps of 1, pre-treating the surface of a magnesium alloy workpiece; 2, cladding the surface of the magnesium alloy workpiece; 3, obtaining the appearance, composition phase and structure characteristics of the cladding layer by combining a Co-Cr phase diagram and a Co-W-C phase diagram by adopting a SEM (scanning electron microscope) or XRD (X-ray diffraction) analysis means and applying a solidification theory; and 4, testing the mechanical performance and electro-mechanical performance of the surface of the magnesium alloy workpiece according to the composition phase, the appearance and characteristics of distribution, grain size, columnar crystal and dendritic crystal of a solidified tissue. A product fulfilling the requirement can be obtained when the specific surface performance can be achieved. The laser cladding method has the advantages of high hardness of the surface of the magnesium alloy, improved wearing and corrosion resistance, firm combination of effective working layer and matrix, has a certain size and thickness, and is low in cost.

Description

【Technical field】 [0001] The invention relates to alloy powder liquid forming, in particular to a laser cladding method for improving the surface properties of magnesium alloy AZ91D. 【Background technique】 [0002] Magnesium alloy has the characteristics of low density, high specific strength and specific stiffness, and good electromagnetic shielding, and is widely used as a lightweight structural material. However, the disadvantages of magnesium alloys, such as low surface hardness, poor wear resistance, and poor corrosion resistance, limit the application of magnesium alloys. In practical applications, a surface coating with high surface hardness, excellent wear resistance and corrosion resistance, a firm bond between the effective working layer and the substrate, a certain size and thickness, and low cost is required, while the surface modification of magnesium alloys in the prior art Technology, in terms of comprehensively improving the mechanical properties and electro...

Claims

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Application Information

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IPC IPC(8): C23C24/10
Inventor 金朝龙颜瑞峰
Owner SUZHOU TIANHONG LASER
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