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A semiconductor laser cladding nickel-based alloy powder for repairing the inner wall of the centrifugal ball mill pipe mold

A nickel-based alloy, laser cladding technology, applied in metal material coating process, coating and other directions, can solve the problems of matrix defects, crack sources, centrifugal ball milling cast pipe mold application, etc., to achieve the effect of eliminating thermal fatigue stress

Active Publication Date: 2019-03-26
山西鑫盛激光技术发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Most of the nickel-based alloy powders used in existing laser cladding are based on CO 2 The gas laser developed, its composition basically does not contain Al element, because CO 2 The emission wavelength of the gas laser is 10600nm, and the absorption rate of Al element to the light of this wavelength is less than 2%. It cannot absorb enough energy to react fully with Ni element to form Ni 3 Al, on the contrary, exists in the form of simple substances or carbides and borides, which not only does not strengthen the matrix of the laser cladding layer, but forms defects or crack sources in the matrix, and even leads to direct cracking of the cladding layer.
However, the relevant laser cladding process has not been applied to the repair of the centrifugal ball milling cast pipe mold

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The base material is 21CrMo10, which is the centrifugal ball mill cast pipe mold material, which is ground before cladding and cleaned with alcohol. The chemical composition of the nickel-based alloy powder used is: C: 0.08%, Cr: 21.00%, B: 1.00%, Fe: 5%, Mo: 9.00%, Al: 5.00%, W: 1.00%, Nb+Ta: 4 %, the rest is Ni.

[0028] The preparation method of the nickel-based alloy powder is sequentially prepared through batching, vacuum smelting, vacuum atomization, drying, and sieving. The mesh number of the nickel-based alloy powder is -100 mesh to +300 mesh, and the purity is ≥99.9%.

[0029] Using a semiconductor laser, the selected laser cladding process parameters are: power 2800W; focal length: 300mm; spot size: 2×10mm; scanning speed: 480mm / min, powder thickness: 0.5mm.

[0030] After laser cladding, the thickness of the obtained cladding layer is about 1mm, the surface is smooth, without defects such as cracks and pores, and the cladding layer and the base metal are met...

Embodiment 2

[0032] The chemical composition of the nickel-based alloy powder used is: C: 0.06%, Cr: 20.00%, B: 0.5%, Fe: 2%, Mo: 8%, Al: 8%, W: 0.6%, Nb+Ta: 2 %, the rest is Ni.

[0033] Repair the surface of the inner diameter of the DN800 centrifugal ball milling cast pipe mold. Due to the large surface cracks during the use of the cast pipe mold, it cannot continue to be used. The inner hole fatigue layer is turned with a deep hole lathe, and then the powder is sprayed by the laser head. The mouth is evenly sprayed, the powder feeding direction is coaxial with the laser beam, the thickness of the cladding layer is 2mm, and there are no cracks, pores and other defects on the surface, and then deep hole processing, the size returns to the state of the new product, and the performance exceeds the new product.

Embodiment 3

[0035] The base material is 21CrMo10, which is the centrifugal ball mill cast pipe mold material, which is ground before cladding and cleaned with alcohol. The chemical composition of the nickel-based alloy powder used is: C: 0.09%, Cr: 22%, B: 0.8%, Fe: 4%, Mo: 10%, Al: 4%, W: 1.2%, Nb+Ta: 6 %, the rest is Ni.

[0036]The preparation method of the nickel-based alloy powder is sequentially prepared through batching, vacuum smelting, vacuum atomization, drying, and sieving. The mesh number of the nickel-based alloy powder is -100 mesh to +300 mesh, and the purity is ≥99.9%.

[0037] Using a semiconductor laser, the selected laser cladding process parameters are: power 2600W; focal length: 320mm; spot size: 3×10mm; scanning speed: 520mm / min, powder thickness: 1.5mm.

[0038] After laser cladding, the thickness of the obtained cladding layer is about 1mm, the surface is smooth, without defects such as cracks and pores, and the cladding layer and the base metal are metallurgicall...

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Abstract

The invention discloses semiconductor laser cladding nickel base alloy powder for repairing an inner wall of a centrifugal ball milling pipe mold, and belongs to a laser surface cladding technology. The nickel base alloy powder comprises the following components in percentage by weight: 0.06-0.09% of C, 20-22% of Cr, 0.5-1.0% of B, 2-6% of Fe, 8-10% of Mo, 4-8% of Al, 0.6-1.2% of W, 2-6% of Nb+Ta,and the balance of Ni; the nickel base alloy powder is laser cladding alloy powder special for a semiconductor layer with a wavelength of 800-1000 nm; when a clad layer is high in impact, and excellent heat fatigue resistance is achieved; under the working conditions of pipe casting through ball milling, the heat fatigue resistance of a laser cladding functional layer can be effectively improved;and after the powder is adopted to repair the inner wall of the pipe mold through laser cladding, the service life of the pipe mold can be prolonged, the production cost is greatly reduced, and the economical benefit is prominently improved.

Description

technical field [0001] The invention relates to a laser surface cladding technology, in particular to a semiconductor laser cladding nickel-based alloy powder with high impact toughness and thermal fatigue resistance for repairing the inner wall of a centrifugal ball milling cast pipe mold. Background technique [0002] Centrifugal nodular cast pipe mold is the key component of centrifugal nodular cast iron pipe. It occupies a high proportion in the manufacturing cost of centrifugal cast nodular cast iron pipe. Its manufacturing cost is expensive, especially the large diameter cast pipe mold, which has been used thousands of times Finally, due to thermal fatigue wear failure, resulting in huge waste. [0003] Repeated wear and maintenance of the pipe mold will cause the inner surface of the pipe mold to be out of tolerance, and there will be defects on the inner surface of the pipe mold that cannot be repaired, such as cracks in the middle of the pipe mold, etc., which will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C23C24/10
CPCC22C19/055C23C24/106
Inventor 姜涵之李文斌
Owner 山西鑫盛激光技术发展有限公司