Nickel-based high-temperature alloy repair material and preparation method thereof

A nickel-based superalloy and repair material technology, applied in the field of additive manufacturing, can solve the problems of affecting the service life of blades and inconvenient engineering application of preheating temperature, and achieve the effect of reducing stress cracking and improving grain boundary cracking

Active Publication Date: 2021-09-03
西安空天机电智能制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional repair methods use preheating before repairing and heat preservation after repairing to avoid cracks. Usually, preheating to a high temperature above 700°C is required to achieve crack-free repairing of high Al+Ti nickel-based superalloys. Higher preheating temperatures are not convenient for engineering applications. If high temperature preheating is used in the repair of superalloy blades, it will affect the service life of the blades

Method used

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  • Nickel-based high-temperature alloy repair material and preparation method thereof
  • Nickel-based high-temperature alloy repair material and preparation method thereof
  • Nickel-based high-temperature alloy repair material and preparation method thereof

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preparation example Construction

[0034] A method for preparing a nickel-based superalloy repair material of the present invention is specifically implemented according to the following steps:

[0035] Step 1, weighing each component metal according to the percentage of each component in a nickel-based superalloy repair material, and smelting each component metal to obtain an alloy block;

[0036] Step 2, cold processing the alloy block to obtain a billet with a diameter of 50 mm and a length of 600 mm, processing the billet into a bright surface with a surface roughness of 6.3 to obtain a bar;

[0037] Step 3. Put the rod in the rotating electrode powder making equipment as the negative electrode and accelerate the rotation. The positive electrode uses a tungsten electrode. After the power is turned on, the negative electrode is heated and the rod is melted and thrown out. The molten metal material forms uniform powder particles in the inert gas space Scattered to obtain alloy powder;

[0038] Step 4, sievin...

Embodiment 1

[0051] A nickel-based superalloy repair material, the material is a powder with a particle size of 75-175 μm, and consists of the following components according to mass percentage: Ni: 33%, Co: 47%, Cr: 10%, Al: 2%, Ta : 3%, W: 4%, Y: 0.5%, Hf: 0.5%, the nickel-based superalloy DZ125 is repaired by laser cladding repair method, and the repair material is clad on the surface of the part to be repaired by laser melting powder at high temperature, reaching Metallurgical bonding. Adopted laser repair process parameters: power 600W, scanning speed 420mm / min, powder feeding volume 11g / min. The laser repair process is carried out in an argon protection or vacuum glove box, which ensures the quality stability of the welding pool under high temperature conditions. After the repair, there is no crack on the surface and inside. The bonding interface between the repaired area and the matrix is ​​metallurgical fusion. The structure is uniform and there is no interface. After the repair, t...

Embodiment 2

[0055] A nickel-based superalloy repair material, the material is a powder with a particle size of 75-175 μm, and consists of the following components according to mass percentage: Ni: 18%, Co: 54%, Hf: 1.5%, Al: 4%, Ta : 3%, W: 1.2%, Cr: 18%, Y: 0.3%.

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Abstract

The invention discloses a nickel-based high-temperature alloy repair material. On one hand, the problem that a high Al + Ti nickel-based high-temperature alloy is melted by a high-energy beam to generate cracks is solved, and the crystal boundary cracking phenomenon at an interface is improved; due to the fact that the repair material does not contain the Ti element, and the Al element is controlled within a range, hard and brittle phases containing Ti, Al and the like in the repair process are avoided; in addition, interface carbide is diluted by adding the Co element, and the stress cracking phenomenon caused by matrix carbide is reduced; generation of liquefied cracks in a laser repair area is avoided through structure component optimization, and the defect-free repair effect is successfully achieved; on the other hand, the content of the molybdenum element is greatly increased, a matrix and a cladding material form an infinite solid solution of nickel and molybdenum, the cracking tendency is eliminated, the use temperature of the alloy is further increased, and the alloy has high strength under the high-temperature condition; and titanium and aluminum of the matrix material and the cladding material form a gamma' precipitation phase, and the mechanical property after repair is further improved.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a nickel-based superalloy repair material, and also relates to a preparation method of the nickel-based superalloy repair material. Background technique [0002] In order to improve its high-temperature service conditions, nickel-based superalloys increase the content of Ti and Al to obtain precipitation-strengthening phases, which promotes the precipitation of γ' precipitates and carbides, thereby greatly improving high-temperature resistance and strength. High susceptibility to strain-aging cracks. Traditional repair methods use preheating before repairing and heat preservation after repairing to avoid cracks. Usually, preheating to a high temperature above 700°C is required to achieve crack-free repairing of high Al+Ti nickel-based superalloys. Higher preheating temperatures are not convenient for engineering applications. If high temperature prehea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/07C22C30/00B22F9/08C23C24/10
CPCC22C19/07C22C30/00B22F9/082C23C24/106B22F2009/0848
Inventor 曹通田杏欢杜鹏程杨晨光
Owner 西安空天机电智能制造有限公司
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