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Preparation method for nickel-base superalloy powder for laser forming

A nickel-based superalloy, laser forming technology, applied in metal processing equipment, transportation and packaging, additive processing, etc., can solve the problems of reducing the quality and performance of formed samples, increasing the production cost of laser forming, complex physical and chemical changes, etc. , to achieve the effects of stable forming performance, low oxygen content, and shortened process flow

Active Publication Date: 2018-12-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nickel-based superalloys have complex components and high melting points, and the physical and chemical changes in the gas atomization process are very complex, and powder hollow defects are prone to occur, resulting in gas inclusions.
At the same time, the particle size of the powder required for powder bed selective laser forming is usually less than 45 μm, and the specific surface area is large. It is very easy to absorb oxygen and increase the oxygen content, resulting in a decrease in the performance of the formed sample.
At present, satellite powder and non-metallic inclusions will appear in the powder prepared by AA method, and the yield of fine powder (particle size less than 50 μm) is low, generally not more than 40%, which increases the production cost of powder bed selective laser forming; laser melting Powders with a particle size of 45 μm to 106 μm required for overmolding often have more hollow defects, and these defects are likely to become crack sources during the laser forming process, reducing the quality and performance of the formed sample
[0004] The invention provides a preparation method of nickel-based superalloy powder for laser forming, and prepares nickel-based superalloy powder meeting the technical requirements of laser forming, which effectively improves the yield of fine powder (particle size less than 50 μm) and solves the problem of Problems such as powder hollow defects and satellite powder

Method used

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  • Preparation method for nickel-base superalloy powder for laser forming
  • Preparation method for nickel-base superalloy powder for laser forming
  • Preparation method for nickel-base superalloy powder for laser forming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Alloy smelting: Put 20kg of nickel-based superalloy raw materials into the vacuum induction melting furnace, and put Ti and Zr into the feeding bin (Ti: 0.82kg, Zr: 0.02kg). Close the hatch, vacuumize and reduce the furnace pressure to 10 -1 MPa, for alloy smelting, when heated to 1570 ° C, Ti and Zr are added through the feeding bin. The nickel-based superalloy raw material includes the following components in terms of mass percentage: Ni: 9.97kg, Co: 4.15kg, Cr: 2.7kg, Mo: 0.765kg, W: 0.418kg, Al: 0.72kg, Ti: 0.82 kg, Ta: 0.488kg, Nb: 0.182kg, Zr: 0.02kg, B: 0.06kg, C: 0.008kg.

[0050] (2) Vacuum degassing: After the alloy is completely melted, perform vacuum degassing at 1580°C for 10 minutes.

[0051] (3) Atomized powder making: The completely melted alloy raw material is introduced into the atomizing furnace through the guide tube at a flow rate of 3.5kg / min, the atomization temperature is controlled at 1650°C, the pressure of the powder making furnace is 0....

Embodiment 2

[0068] (1) Alloy smelting: Put 20kg of nickel-based superalloy raw materials into the vacuum induction melting furnace, and put Ti and Zr into the feeding bin (Ti: 0.82kg, Zr: 0.02kg). Close the hatch, vacuumize and reduce the furnace pressure to 10 -1 MPa, heating starts to carry out alloy smelting, when heating to 1570°C, Ti and Zr are added through the feeding bin. The nickel-based superalloy raw material includes the following components in terms of mass percentage: Ni: 9.96kg, Co: 4.13kg, Cr: 2.7kg, Mo: 0.758kg, W: 0.413kg, Al: 0.727kg, Ti: 0.82 kg, Ta: 0.486kg, Nb: 0.182kg, Zr: 0.02kg, B: 0.06kg, C: 0.008kg.

[0069] (2) Vacuum degassing: After the alloy is completely melted, perform vacuum degassing at 1610°C for 5 minutes.

[0070] (3) Atomized pulverization: The completely melted alloy raw material is introduced into the atomization furnace through the guide tube at a flow rate of 4kg / min, the atomization temperature is controlled at 1670°C, the pulverization furnac...

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Abstract

The invention discloses a preparation method for nickel-base superalloy powder for laser forming, and belongs to the field of superalloy and powder metallurgy. According to the preparation method, vacuum induction melting and argon atomization powder making technologies are adopted, and the nickel-base superalloy powder suitable for laser forming is prepared. The nickel-base superalloy powder prepared through the method is high in small grain size powder, high in degree of sphericity, low in oxygen content, good in flowing performance, free of hollow defects, less in satellite powder and capable of meeting the technical requirement for laser forming.

Description

technical field [0001] The invention relates to a preparation method of nickel-based superalloy powder for laser forming, belonging to the field of superalloy and powder metallurgy. Background technique [0002] Nickel-based superalloys have excellent high-temperature corrosion resistance, fatigue resistance, wear resistance and high strength, and are widely used in aero-engine turbine disks, rocket engines, aerospace vehicles and other fields. However, nickel-based superalloys are difficult to cut and have a low degree of freedom in forming. Laser forming provides a new technical approach to solve the problems of forming and application of nickel-based superalloys. Laser forming is an important additive manufacturing technology (additive manufacturing, AM) developed in the mid-1990s, including powder bed laser forming technology (selective laser melting) and powder laser cladding technology. Laser forming can directly obtain solid parts with good metallurgical bonding and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B22F1/00B33Y70/00C22C19/05
CPCC22C19/056B22F9/082B33Y70/00B22F2009/088B22F1/14
Inventor 刘祖铭段然曦陈仕奇王帅辜恩泽文靖瑜吕学谦李全彭凯赵凡
Owner CENT SOUTH UNIV
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