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A method for repairing micro-crack tips on stainless steel surfaces using nanoparticles

A micro-crack and nano-particle technology, applied in the field of stainless steel, can solve the problems of easy occurrence of thermal cracks, large heat input, shrinkage deformation, etc., and achieve the effect of easy control of thickness, high flexibility, and small stress deformation.

Active Publication Date: 2017-12-26
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional repair methods, such as argon arc welding, plasma spraying, plasma arc welding, and tungsten inert gas shielded welding, are simple in process but require a large amount of heat input during the repair process, and thermal cracks are prone to appear in the heat-affected zone, and welding is easy to deform , it is easy to cause problems such as falling off and cracking during use, and it is easy to cause shrinkage and deformation during the repair process, so the application of these methods has great limitations

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  • A method for repairing micro-crack tips on stainless steel surfaces using nanoparticles
  • A method for repairing micro-crack tips on stainless steel surfaces using nanoparticles
  • A method for repairing micro-crack tips on stainless steel surfaces using nanoparticles

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Embodiment Construction

[0022] specific implementation plan

[0023] The present invention is further illustrated below through specific implementation examples.

[0024] First, the tip of the tiny crack on the surface of 304 stainless steel is treated, polished with sandpaper, then cleaned with absolute ethanol, and then dried.

[0025] Secondly, blend the composite powder containing nano-WC and micron 304 stainless steel powder with absolute ethanol, and evenly pre-place it on the surface of the base stainless steel. The pre-powder area is about 100mm 2 , the thickness is 1mm, and the mass of the powder is about 2g, which ensures smooth surface and low porosity.

[0026] Then, the high energy density of the laser beam is used to rapidly condense the composite powder and the matrix material, so that the composite powder and the matrix are metallurgically bonded and tightly bonded together, thereby completing the repair of the crack. Finally, remove the excess powder remaining at the tip of the tin...

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Abstract

The invention provides a method for repairing a microcrack tip on a stainless steel surface by means of nano-particles. The method is suitable for stainless steel with microcracks on the surface. The method comprises the steps that the to-be-repaired microcrack tip on the stainless steel surface is treated; composite powder containing the nano-particles is arranged on the microcrack tip in advance; the composite powder and a part of a matrix are fused by means of lasers; the repaired microcrack tip region is finished; and the fracture property of the stainless steel matrix obtained after repairing is detected, and the microstructure of the section of a repair layer is observed. The repairing method is high in flexibility, and repairing can be carried out many times; and meanwhile, the problems of large deformation, a large heat affected zone and the like in a conventional method are avoided in the repairing method. According to the repairing method, the microcrack tip is closed again, the matrix and the composite powder arranged on the microcrack tip in advance are in metallurgical bonding, and the defects of cracks, pores and the like do not exist in the bonding region; grains of the repair layer of the microcrack tip are refined, and the structural compactness is improved; and in addition, the fracture property generated after repairing is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of crack repair, and relates to a method for repairing the tips of tiny cracks on the surface of stainless steel by using nanoparticles. The method is suitable for stainless steel with tiny cracks on the surface. Background technique [0002] Due to its good strength and superior corrosion resistance, stainless steel is widely used in automotive, energy, aerospace and other fields. The service workpiece made of stainless steel will produce microscopic defects under the influence of cyclic loading and working stress, and the microscopic defects will slowly expand into macroscopic cracks. In order to ensure the safety of the workpieces in service, we have to reluctantly discard the workpieces containing tiny cracks. Equally, because stainless steel can produce damage or scratch on its surface in the process of processing, transportation, if can not carry out good recovery to workpiece, whole workpiece will be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 蒋玮蒋险峰
Owner DALIAN UNIV OF TECH
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