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NbC particle reinforced iron-based abrasion-resistant laser cladding coating containing rare earth elements and preparation method

A technology of laser cladding and particle enhancement, which is applied in the direction of coating, metal material coating process, etc., to achieve the effect of convenient operation, easy automation and simple preparation process

Inactive Publication Date: 2014-01-22
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to propose a NbC particle-reinforced iron-based wear-resistant laser cladding coating containing rare earth elements and a preparation method for the shortcomings of existing laser cladding and the wear and failure mechanism of automobile extrusion dies. Solve the problem of surface strengthening of automobile die steel

Method used

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  • NbC particle reinforced iron-based abrasion-resistant laser cladding coating containing rare earth elements and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The coating is prepared under higher power and larger powder feeding rate to obtain a cladding layer with a larger height and width.

[0029] (1) Cr12MoV steel substrate pretreatment

[0030] The surface of the processed automobile die steel Cr12MoV steel substrate is sanded, degreased, and derusted to obtain a smooth and smooth surface.

[0031] (2) Laser cladding

[0032] The composition of the alloy powder used to prepare the coating is:

[0033] Nb: 10wt.%

[0034] Cr: 15wt.%

[0035] B: 1.62wt.%

[0036] Si: 1.5wt.%

[0037] C: 2.5wt.%

[0038] The rest is Fe and unavoidable trace impurities.

[0039] The particle size range of alloy powder is 75-150μm. Add CeO with a particle size range of 35-45 μm to the alloy powder 2 . CeO 2 The addition amount is 4wt.% of the total mass of the cladding alloy powder. After mixing the powder, mix it evenly and dry it for 2 hours. Adjust the laser cladding process parameters, laser power 2000W, scanning speed 4mm / s, ...

Embodiment 2

[0041] The coating is prepared at lower power and smaller powder feeding rate to obtain a cladding layer with smaller height and width.

[0042] (1) Cr12MoV steel substrate pretreatment

[0043] Sand the surface of the processed automobile die steel Cr12MoV steel substrate with sandpaper, degrease and derust to obtain a smooth and smooth surface;

[0044] (2) Laser cladding

[0045] The composition of the alloy powder used to prepare the coating is:

[0046] Nb: 15wt.%

[0047] Cr: 10wt.%

[0048] B: 1.62wt.%

[0049] Si: 1.5wt.%

[0050] C: 4.5wt.%

[0051] The rest is Fe and unavoidable trace impurities.

[0052] The particle size range of alloy powder is 75-150μm. Add CeO with a particle size range of 35-45 μm to the alloy powder 2 . CeO 2 The addition amount is 3wt.% of the total mass of the cladding alloy powder. After mixing the powder, mix it evenly and dry it for 2 hours. Adjust the laser cladding process parameters, laser power 1500W, scanning speed 6mm / s...

Embodiment 3

[0054] Increase the C content in the cladding powder to obtain a high hardness coating.

[0055] (1) Cr12MoV steel substrate pretreatment

[0056] Sand the surface of the processed automobile die steel Cr12MoV steel substrate with sandpaper, degrease and derust to obtain a smooth and smooth surface;

[0057] (2) Laser cladding

[0058] The composition of the alloy powder used to prepare the coating is:

[0059] Nb: 12wt.%

[0060] Cr: 12wt.%

[0061] B: 1.62wt.%

[0062] Si: 1.5wt.%

[0063] C: 5.5wt.%

[0064] The rest is Fe and unavoidable trace impurities.

[0065] The particle size range of alloy powder is 75-150μm. Add CeO with a particle size range of 35-45 μm to the alloy powder 2 . CeO 2 The addition amount is 8wt.% of the total mass of the cladding alloy powder. After mixing the powder, mix it evenly and dry it for 2 hours. Adjust the laser cladding process parameters, laser power 1800W, scanning speed 8mm / s, spot diameter: 5×5mm, powder feeding rate: 12g / m...

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Abstract

The invention relates to an NbC particle reinforced iron-based abrasion-resistant laser cladding coating containing rare earth elements and a preparation method thereof, and belongs to the technical field of laser cladding. The preparation method comprises the following steps: polishing the surface of a steel base body with abrasive paper and then derusting and degreasing the surface of the steel base body so as to obtain a smooth and clean surface; mechanically mixing alloy powder for cladding and CeO2 in proportion according to chemical components; drying the powder after being evenly mixed; feeding the powder into a powder feeder; preparing an abrasion-resistant coating on the surface of the steel base body in a coaxial powder-feeding laser cladding manner, wherein the alloy powder comprises the following components by weight percent: 10% to 15% of Nb, 10% to 15% of Cr, 1% to 3% of B, 1% to 3% of Si, 1.5% to 5.5% of C and the balance of Fe and inevitable trace impurities; the adding amount of the CeO2 accounts for 3% to 8% of the alloy powder according to the weight percent. A hard ceramic phase is generated by performing an in-situ reaction on the NbC particle reinforced iron-based abrasion-resistant laser cladding coating; the good metallurgical bonding between the NbC particle reinforced iron-based abrasion-resistant laser cladding coating and the base body is realized. The NbC particle reinforced iron-based abrasion-resistant laser cladding coating is compact in tissue and free of pores and cracks.

Description

technical field [0001] The invention belongs to the technical field of laser cladding, and in particular relates to a NbC particle-reinforced iron-based wear-resistant laser cladding coating containing rare earth elements and a preparation method thereof. Background technique [0002] Due to the unique and excellent properties of lasers, since the successful development of lasers in the middle of the 20th century, they have been widely used in scientific and technological research and industrial production. Laser surface modification is a new application of laser in the field of surface technology. According to different laser energy densities and different processing methods, the typical methods in laser surface technology include laser cladding, laser phase transformation hardening, laser shock strengthening, and laser surface alloying. The purpose of these methods is to make the working surface obtain high hardness, high wear resistance and high corrosion resistance and ...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C32/00
Inventor 李庆棠雷永平乔虹蒋志强蒋业华符寒光
Owner BEIJING UNIV OF TECH
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