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Method for reducing additive manufacturing cracks of nickel-based superalloy and nickel-based superalloy

A technology of nickel-based superalloy and additive manufacturing, which is applied in the field of nickel-based superalloy to reduce cracks in nickel-based superalloy additive manufacturing, and can solve the problems of easy deformation, limited production and application of laser additive manufacturing technology, and high residue Stress and other problems, to achieve the effect of improving mechanical properties

Active Publication Date: 2022-05-13
CENT SOUTH UNIV +1
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  • Application Information

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Problems solved by technology

However, in the process of laser additive manufacturing, the repeated rapid heating and rapid cooling will generate a lot of welding stress in the cladding layer and the base material, which will induce various welding cracks, resulting in the quality of the cladding layer not up to standard. It cannot be used, which makes the printed parts have high residual stress, prone to deformation and cracking, and has a great impact on the performance of the printed parts, which greatly limits the production and application of laser additive manufacturing technology

Method used

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  • Method for reducing additive manufacturing cracks of nickel-based superalloy and nickel-based superalloy
  • Method for reducing additive manufacturing cracks of nickel-based superalloy and nickel-based superalloy
  • Method for reducing additive manufacturing cracks of nickel-based superalloy and nickel-based superalloy

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Embodiment 1

[0028] (1) In Example 1, the following IN718 nickel-based superalloy is used, and the mass fraction of 0.5% rare earth element Re is added, and the mass percentage of IN718 nickel-based superalloy is: Cr: 20%, Fe: 12%, Mo: 3%, Nb: 5%, Co: 18%, C: 0.05%, Mn: 0.02%, Si: 0.2%, Cu: 0.02%, Al: 0.5%, Ti: 1%, B: 0.005%, and the balance is Ni.

[0029] (2) The primary particle size of IN718 is fine enough. In order to reduce the total grinding time, the powder mixture is prepared in two stages. The first stage is mechanical alloying, the weight ratio of IN718 nickel-based superalloy and Re powder is 1:1; in the second stage, the remaining IN718 powder is added and mixed to obtain a powder mixture. Grinding was carried out in a single ball mill at a constant speed of 200 rpm and 25 balls with a diameter of 25 mm.

[0030] (3) Put the mixed powder into the SLM forming equipment, choose 304 stainless steel as the substrate, preheat the substrate to 120°C, and pass high-purity argon gas ...

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Abstract

The invention discloses a method for reducing additive manufacturing cracks of nickel-based superalloy and the nickel-based superalloy. The method comprises the steps that nickel-based superalloy powder serves as a raw material and is mixed with Re powder, and forming is conducted through the additive manufacturing technology; wherein the content of the Re powder is 0.5 to 2.0 mass percent. By adding the rare earth element Re, dendritic grains of the nickel-based high-temperature alloy subjected to heat treatment are finer, gamma'phase in the nickel-based alloy is precipitated and separated out, a matrix is strengthened, the mechanical performance of the alloy in a high-temperature state is promoted to be greatly improved, and therefore the nickel-based high-temperature alloy is widely applied to high-temperature severe places such as turbine engines.

Description

technical field [0001] The invention belongs to the technical field of organic compound synthesis, and in particular relates to a method for reducing cracks in nickel-based superalloy additive manufacturing and the nickel-based superalloy. Background technique [0002] In recent years, with the gradual development of 3D printing technology, laser selective melting technology has been more and more applied to the printing of metal parts, and the rapid manufacturing of nickel-based superalloy parts has made a major breakthrough, especially through laser selective melting Technology (SLM) for direct manufacturing of nickel-based superalloy parts has greatly promoted the manufacturing efficiency and optimization and upgrading of important parts in aerospace, petrochemical and other fields. Laser additive manufacturing technology can satisfy the manufacturing of parts with complex structures while maintaining high precision and high strength, and has great market potential. Howe...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C19/05B22F1/00C22F1/10B22F10/28B33Y10/00B33Y70/00
CPCC22C1/023C22C19/055C22F1/10B22F10/28B33Y10/00B33Y70/00Y02P10/25
Inventor 袁铁锤陈吕斌李瑞迪易出山吕亮
Owner CENT SOUTH UNIV
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