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Alloy powder for high-strength bainite steel laser repairing and preparing method of alloy powder

A technology of bainitic steel and alloy powder, which is applied in the coating process and coating of metal materials, can solve the problems of poor plasticity and toughness, low strength of the repair layer, and poor interface matching, so as to achieve good bonding and avoid heat-affected zones , Improve the hardness and toughness effect

Active Publication Date: 2019-10-18
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a high-strength bainitic steel laser repair alloy powder and its preparation method to solve the problems of low strength, poor plasticity and toughness, and poor interface matching of the prior art repair layer.

Method used

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  • Alloy powder for high-strength bainite steel laser repairing and preparing method of alloy powder
  • Alloy powder for high-strength bainite steel laser repairing and preparing method of alloy powder
  • Alloy powder for high-strength bainite steel laser repairing and preparing method of alloy powder

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Embodiment 1

[0030] Example 1: An alloy powder for laser repair of high-strength bainite steel, with a total mass of 100g, including the following alloy components and their mass percentages: C: 0.29g; Si: 1.5g; Mn: 1.5g; Cr: 0.96g ; Ni: 1.2g; Al: 1.0g; Mo: 0.5g;

[0031] Step 1: Weigh the raw materials according to the mass percentage of the above-mentioned components, put them into a vacuum melting furnace and melt them completely, the vacuum degree of the vacuum melting furnace is 50Pa, and the melting temperature is 1620°C;

[0032] Step 2: Pour the above molten alloy solution into the atomization tower, and use inert gas for gas atomization. The atomization pressure is 8.5 MPa, and the gas atomization time is 6 minutes. The solution is crushed by the inert gas and cooled to obtain alloy powder;

[0033] Step 3: Use a powder sieving machine to select the alloy powder with a particle size of 100-214 mesh to obtain an alloy powder for laser repair of high-strength bainite steel with a pa...

Embodiment 2

[0035] Example 2: An alloy powder for laser repair of high-strength bainite steel, with a total mass of 100g, including the following alloy components and their mass percentages: C: 0.35g, Si: 2.5g, Mn: 1.5g, Cr: 2.0g , Ni: 2.0g, Al: 1.2g, Mo: 1.5g, Fe: balance, the preparation method of alloy powder for laser repair of high-strength bainitic steel comprises the following steps:

[0036] Step 1: Weigh the raw materials according to the mass percentage of the above components, put them into a vacuum melting furnace and melt them completely, the vacuum degree of the vacuum melting furnace is 35Pa, and the melting temperature is 1600°C;

[0037] Step 2: Pour the above molten alloy solution into the atomization tower, and use inert gas for gas atomization. The atomization pressure is 7.5 MPa, and the gas atomization time is 8 minutes. The solution is crushed by the inert gas and cooled to obtain alloy powder;

[0038] Step 3: Use a powder sieving machine to select the alloy powder w...

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Abstract

The invention discloses alloy powder for high-strength bainite steel laser repairing and a preparing method of the alloy powder, and belongs to the technical field of alloy powder materialscience. Thealloy powder comprises various components including, by mass, 0.25%-0.85% of C, 0.8%-3.5% of Si, 0.5%-1.5% of Mn, 0.5%-2.0% of Cr, 0%-2.0% of Ni, 0%-3% of Al, 0.1%-1.5% of Mo and the balance Fe. Thepreparing method comprises the steps that firstly, according to the mass percentages of the components, element burning losses are considered, and raw materials are weighed and placed in a vacuum smelting furnace to be completely melted; secondly, a melted alloy solution is poured into an atomization tower, inert gas is utilized for gas atomization, the solution is crushed by the inert gas, and after cooling, the alloy powder is obtained; and thirdly, a powder screening machine is used for selecting the alloy powder with the target particle size. The alloy powder can be used for high-strengthbainite steel surface and volume damage repairing, after repairing, the sample cladding layer and base material interface structure and performance transition isgood, the repaired layer is free of cracks and slag inclusions; and compared with a base body, the bainite structure is finer, and the hardness is 390-550 Hv.

Description

technical field [0001] The invention relates to an alloy powder for laser repair of high-strength bainite steel and a preparation method thereof, belonging to the field of science and technology of alloy powder materials. Background technique [0002] Bainite steel is a new type of high-strength steel, which has excellent plasticity and toughness while ensuring high strength, and excellent comprehensive performance. It is widely used in the manufacture of critical parts in aerospace, shipbuilding, nuclear power, national defense and other fields. The service environment of this kind of parts is usually relatively harsh, and it is easy to cause surface damage and volume damage due to factors such as wear, corrosion, and fatigue during the service process, resulting in part failure. In addition, misprocessing will inevitably occur during the part manufacturing process, resulting in scrapped parts. High-strength bainitic steel parts are often expensive to manufacture, and dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10B22F9/08C22C38/02C22C38/04C22C38/06C22C38/44
CPCB22F9/082C22C38/02C22C38/04C22C38/06C22C38/44C23C24/103
Inventor 方金祥江易林杨文龙
Owner GUIZHOU UNIV
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