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δ-phase strengthened nickel-based superalloy and preparation method thereof

A technology for nickel-based superalloy and matrix alloy powder, which is applied in the field of new delta-phase reinforced nickel-based superalloy and its preparation, can solve the problems of decreased dynamic mechanical properties of alloys, decreased machinability of alloys, decreased stability of strengthened phases, and the like, Achieve the effect of increasing the long-range elastic stress field, improving the creep performance, and improving the anti-oxidation performance

Active Publication Date: 2021-11-02
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are two main ways to improve its temperature bearing capacity: one is to adjust the composition of the alloy, such as increasing the content of Ti+Al or adding alloy elements such as Ta, the problem of this method is that the machinability of the alloy decreases and the density of the alloy increases. High, the stability of the strengthening phase decreases; another way is to introduce oxide particles into the nickel-based superalloy, the problem of this method is that the oxide particles in the alloy and the matrix interface are easy to form a crack source, resulting in a decrease in the dynamic mechanical properties of the alloy

Method used

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  • δ-phase strengthened nickel-based superalloy and preparation method thereof
  • δ-phase strengthened nickel-based superalloy and preparation method thereof
  • δ-phase strengthened nickel-based superalloy and preparation method thereof

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preparation example Construction

[0046] A method for preparing the novel δ-phase-strengthened nickel-based superalloy, comprising:

[0047] The matrix alloy powder and the intermetallic compound Nb 3 Al powders are mixed, processed, and formed by hot isostatic pressing to obtain the novel δ-phase-strengthened nickel-based superalloy.

[0048] The hot isostatic pressing process is to place the product in a closed container, apply equal pressure in all directions to the product, and apply high temperature at the same time. Under the action of high temperature and high pressure, the product can be sintered and densified. Hot isostatic pressing is an indispensable method for the production of high-performance materials and the development of new materials; hot isostatic pressing can be directly powder-molded, and the powder is packed into a sheath, which can be made of metal or ceramics (low carbon steel, Ni, Mo, glass, etc.), and then use nitrogen and argon as the pressurized medium to make the powder directly ...

Embodiment 1

[0065] A new type of delta-phase strengthened nickel-based superalloy, its chemical composition is: 10.0%Cr, 14.5Co, 6.0%W, 5.0%Mo, 35%Nb, 5%Al, and the rest is Ni. Among them, the strengthening phase Nb 3 The volume fraction of Al powder is 40%.

[0066] The specific steps of its preparation are: use argon atomization method to prepare matrix alloy powder, the composition of matrix alloy is 10.0%Cr, 14.5%Co, 6.0%W, 5.0%Mo, and the rest is Ni; use arc melting method to prepare Nb 3 Al powder, the mass ratio of raw material Nb and Al is 11:1; Matrix alloy powder and Nb 3 The Al powder was sieved using a 200-mesh standard sieve to obtain a powder with a particle size of ~75 μm. The base alloy powder and Nb 3 The Al powder is uniformly mixed by ball milling according to the volume ratio of 1:1. The process parameters of ball milling are ball-to-material ratio 10:1, rotating speed 150r / min, and ball milling time 3h; the uniformly mixed alloy powder is formed by hot isostatic pr...

Embodiment 2

[0072] A new type of δ-phase strengthened nickel-based superalloy, its chemical composition is: 5.6%Cr; 7.9%Co; 3.4%W; 3.0%Mo; ​​45.5Nb%; 4.7%Al, the rest is Ni. Among them, the strengthening phase Nb 3 The volume fraction of Al powder is 40%.

[0073] The specific steps of its preparation are: use argon atomization method to prepare matrix alloy powder, the composition of matrix alloy is 10.2%Cr, 14.9%Co, 6.2%W, 5.2%Mo, and the rest is Ni; use arc melting method to prepare Nb 3 Al powder, the mass ratio of raw material Nb and Al is 11:1; Matrix alloy powder and Nb 3 The Al powder was sieved using a 200-mesh standard sieve to obtain a powder with a particle size of ~75 μm. The base alloy powder and Nb 3 The Al powder is uniformly mixed by ball milling according to the volume ratio of 1:1. The process parameters of ball milling are ball-to-material ratio 10:1, rotating speed 120r / min, and ball milling time 3h; the uniformly mixed alloy powder is formed by hot isostatic press...

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Abstract

The present application provides a novel delta phase reinforced nickel-based superalloy and a preparation method thereof. New delta phase strengthened nickel-based superalloy, calculated in mass percentage, including: 8%-18%Cr, 8%-18%Co, 2.5%-6.5%W, 3%-6%Mo, 30%-45.5%Nb , 3%-10%Al and 30%-45%Ni; among them, the new δ-phase strengthened nickel-based superalloy is made of intermetallic compound Nb 3 Al acts as a strengthening phase. The preparation method of a new type of delta phase strengthened nickel-based superalloy, comprising: mixing matrix alloy powder and intermetallic compound Nb 3 Al powders are mixed and processed by hot isostatic pressing to obtain nickel-based superalloys. The nickel-based superalloy has a stable structure, and the strengthening phase in the alloy is uniformly distributed in the matrix and forms a good metallurgical bond with the γ-matrix, which can meet higher service temperatures.

Description

technical field [0001] The application relates to the field of metallurgy, in particular to a novel delta-phase-strengthened nickel-based superalloy and a preparation method thereof. Background technique [0002] With the development of aero-engines towards high thrust-to-weight ratio and high reliability, there is a higher demand for the temperature-bearing capacity of nickel-based superalloys used in the hot end of aero-engines such as turbine disks. At present, alloys commonly used in turbine disks, such as Inconel718 alloy, Waspaloy alloy, and U720Li alloy, are all γ’ phase-strengthened alloys. [0003] At present, there are two main ways to improve its temperature bearing capacity: one is to adjust the composition of the alloy, such as increasing the content of Ti+Al or adding alloy elements such as Ta, the problem of this method is that the machinability of the alloy decreases and the density of the alloy increases. High, the stability of the strengthening phase decre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C27/02C22C30/00B22F3/15C22C1/04
CPCC22C19/056C22C27/02C22C30/00C22C1/045C22C1/0433B22F3/15C22C1/047
Inventor 郑磊刘晓赵鑫王轩
Owner UNIV OF SCI & TECH BEIJING