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Zinc-corrosion-resistant coating cobalt-based alloy powder for laser cladding

A laser cladding, cobalt-based alloy technology, used in the fields of chemistry and metallurgy, can solve the problems of different expansion coefficients, difficult machining, unstable performance, etc., achieve moderate fatigue resistance, reduce the melting point of the alloy, and improve the quality of grain boundaries. Effect

Inactive Publication Date: 2014-12-10
王晓飚 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] These mixed cobalt-based alloy powders have problems such as uneven mixing, large particle size differences, different melting points, composition deviations, and different expansion coefficients, which lead to uncontrollable cracks, pores, segregation, unstable performance, and difficulty in machine processing in actual cladding. and other defects
[0006] Although these cobalt-based alloy powders used for laser cladding can achieve certain technical effects in repairing specific equipment components, they cannot meet and be applicable to the process requirements of laser cladding of other specific substrates due to their own process characteristics. In particular, it cannot meet the crack resistance, formability, process stability and composition uniformity of cobalt-based alloy powder in the laser cladding layer, and at the same time meet the requirements for zinc corrosion resistance of the cladding layer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0038] The base material selected in this embodiment is the sinker roll body of the galvanizing line. The surface of the pipe wall is ground with a grinding machine, the surface roughness is Ra=0.5μm, and it is cleaned with acetone before cladding. The chemical composition of the cobalt-based alloy powder used is: Cr: 24%; Mo: 3%; W: 0.8%; Ni: 1.5%; V: 1%; Fe: 1%; Si: 0.5%; Y 2 o 3 : 0.1%; Hf: 0.1%; Co: balance. Using semiconductor lasers, the selected laser cladding process parameters are: power: 1200~2800W, focal length: 220~350mm, spot size: 2×2mm~5×5mm, scanning speed: 240~720mm / min, powder thickness: 0.5~1.5mm.

[0039]After laser cladding, the thickness of the zinc corrosion-resistant layer obtained is about 1mm. The surface of the zinc corrosion-resistant layer is smooth without cracks, pores and other defects. .

example 2

[0041] The base material selected in this embodiment is the sinker roll body of the galvanizing line. The surface of the pipe wall is ground with a grinding machine, the surface roughness is Ra=0.5μm, and it is cleaned with acetone before cladding. The chemical composition of the cobalt-based alloy powder used is: Cr: 25%; Mo: 4%; W: 1%; Ni: 2%; V: 1.2%; Fe: 0.8%; Si: 0.5%; Y 2 o 3 : 0.1%; Hf: 0.1%; Co: balance. Using semiconductor lasers, the selected laser cladding process parameters are: power: 1200~2800W, focal length: 220~350mm, spot size: 2×2mm~5×5mm, scanning speed: 240~720mm / min, powder thickness: 0.5~1.5mm.

[0042] After laser cladding, the thickness of the zinc corrosion-resistant layer obtained is about 1mm. The surface of the zinc corrosion-resistant layer is smooth without cracks, pores and other defects. .

example 3

[0044] The base material selected in this embodiment is the sinker roll body of the galvanizing line. The surface of the pipe wall is ground with a grinding machine, the surface roughness is Ra=0.5μm, and it is cleaned with acetone before cladding. The chemical composition of the cobalt-based alloy powder used is: Cr: 26%; Mo: 5%; W: 1.2%; Ni: 2.5%; V: 1.5%; Fe: 0.6%; Si: 0.6%; Y 2 o 3 : 0.2%; Hf: 0.2%; Co: balance. Using semiconductor lasers, the selected laser cladding process parameters are: power: 1200~2800W, focal length: 220~350mm, spot size: 2×2mm~5×5mm, scanning speed: 240~720mm / min, powder thickness: 0.5~1.5mm.

[0045] After laser cladding, the thickness of the zinc corrosion-resistant layer obtained is about 1mm. The surface of the zinc corrosion-resistant layer is smooth without cracks, pores and other defects. .

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Abstract

The invention belongs to the technical field of chemistry and metallurgy and particularly relates to a zinc-corrosion-resistant coating cobalt-based alloy powder for laser cladding. The powder comprises the following components in percentages by mass: 24-30% of Cr, 3-8% of Mo, 0.8-2% of W, 1.5-4% of Ni, 1-2.5% of V, 0.3-1% of Fe, 0.5-1% of Si, and is characterized by further comprising 0.1-0.3% of Y2O3, 0.1-0.3% of Hf and the balance of Co. According to the powder disclosed by the invention, the crack resistance, the formability, the stability of process and the uniformity of the components of the cobalt-based alloy powder in the laser cladding layer are improved and the requirements of a processing part on comprehensive performances, such as zinc corrosion resistance, wear resistance, fatigue resistance and moderate hardness of the cladding layer are met.

Description

technical field [0001] The invention belongs to the technical fields of chemistry and metallurgy, and relates to a cobalt-based alloy powder material suitable for laser cladding, in particular to a zinc-corrosion-resistant coating cobalt-based alloy powder for laser cladding. Background technique [0002] At present, the zinc corrosion-resistant coatings at home and abroad are mostly produced by traditional processes such as spraying and spray welding. The zinc corrosion-resistant coatings produced by these traditional processes have some difficult problems to overcome. For example, the actual functional layer of the zinc corrosion-resistant layer is very thin; defects such as pores and inclusions are prone to occur during the manufacturing process of the coating; the bonding surface between the coating and the base metal is non-metallurgical, and the coating is prone to problems such as peeling off. The use of laser cladding technology to manufacture zinc corrosion-resistan...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C19/07
Inventor 王晓飚姜涵之
Owner 王晓飚
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