A kind of nickel-based superalloy 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, inconvenient engineering application of preheating temperature, etc., and achieve the effect of reducing stress cracking phenomenon and improving grain boundary cracking phenomenon.

Active Publication Date: 2022-05-24
西安空天机电智能制造有限公司
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  • 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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  • A kind of nickel-based superalloy repair material and preparation method thereof
  • A kind of nickel-based superalloy repair material and preparation method thereof
  • A kind of nickel-based superalloy repair material and preparation method thereof

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preparation example Construction

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

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

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

[0037] Step 3. Place the rod in the rotating electrode powder-making equipment as a negative electrode and accelerate the rotation. The positive electrode adopts a tungsten electrode. After electrification, the negative electrode is heated and the rod is melted and thrown out, and the molten metal material forms uniform powder particles in the inert gas space. Scatter, that is to obtain alloy powder; ...

Embodiment 1

[0051] A nickel-based superalloy repair material, the material is powder with a particle size of 75-175 μm, and is composed 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. Metallurgical bonding. The adopted laser repair process parameters: power 600W, scanning speed 420mm / min, powder feeding amount 11g / min. The laser repair process is carried out in an argon gas protection or a vacuum glove box, which ensures the quality stability of the welding pool under high temperature conditions. After repairing, the inspection surface and interior have no cracks, the bonding interface between the repaired area and the matrix is ​​metallurgical fusion, the structure is uniform without interface, and the internal strengthened structure after repair is a small γ' phase. Internal tissue testing such as figure 2 As shown, no cracks ...

Embodiment 2

[0055] A nickel-based superalloy repair material, the material is powder with a particle size of 75-175 μm, and is composed 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 superalloy repair material. On the one hand, it solves the problem of cracks in the high-Al+Ti nickel-based superalloy melted by a high-energy beam, and not only improves the grain boundary cracking phenomenon at the interface, because the repair material does not contain Ti element, and control the Al element in a range, avoid the hard and brittle phases containing Ti and Al in the repair process, and dilute the interface carbide through the addition of Co element to reduce the stress cracking phenomenon caused by the matrix carbide; Optimization avoids the occurrence of liquefaction cracks in the laser repair area, and successfully achieves a defect-free repair effect; on the other hand, by greatly increasing the content of molybdenum, the substrate and cladding materials form an infinite solid solution of nickel and molybdenum, in addition to eliminating the tendency of cracking to further improve The use temperature of the alloy is lowered, so that it has higher strength under high temperature conditions; the titanium and aluminum of the base material and the cladding material form a γ' precipitated phase, which further improves the mechanical properties after repair.

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 a nickel-based superalloy repair material. Background technique [0002] In order to improve the high-temperature service conditions of nickel-based superalloys, the precipitation strengthening phase is obtained by increasing the content of Ti and Al, which promotes the precipitation of γ' precipitation phase and carbides, thereby greatly improving the high temperature resistance and strength, and at the same time leading to the material being relatively weak. High strain-aging crack susceptibility. The traditional repair method uses preheating before repairing and heat preservation after repairing to avoid cracks. Usually, it needs to be preheated to a high temperature above 700 °C to achieve crack-free repair of high Al+Ti nickel-based superalloys. Higher preheating...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C22C19/07C22C30/00B22F9/14C23C24/10
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