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Ni-Co-Cr series single crystal superalloy and preparation method thereof

A ni-co-cr, high-temperature alloy technology, applied in the field of nickel-based high-temperature alloys, can solve the problems of reducing the strengthening effect of the γ′ phase, the concentration of stress at the incoherent interface, and the consumption of γ′ phase-forming elements, etc., to achieve excellent high-temperature mechanics performance, increased volume fraction, and excellent tissue stability

Active Publication Date: 2022-02-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the γ matrix of the high-entropy superalloy will dissolve more γ′ phase-forming elements such as Al and Ti, resulting in a lower volume fraction of the γ′ phase, reducing the strengthening effect of the γ′ phase, and resulting in a lower alloy strength, such as Ni 30 co 30 Fe 13 Cr 15 al 6 Ti 6 In high-entropy superalloys, even if the atomic percentage of γ′ phase forming elements Al and Ti reaches 12%, the volume fraction of γ′ phase is only 38.8%
In addition, most of the current high-entropy superalloys are polycrystalline alloys prepared by arc melting or induction melting, and when polycrystalline high-entropy superalloys are subjected to high-temperature service, Al and Ti elements tend to segregate at grain boundaries to form brittle metals. Intercompound (β phase), consumes a large amount of γ′ phase forming elements, and at the same time, the non-coherent interface formed by γ matrix and β phase is prone to stress concentration and cracks

Method used

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  • Ni-Co-Cr series single crystal superalloy and preparation method thereof
  • Ni-Co-Cr series single crystal superalloy and preparation method thereof
  • Ni-Co-Cr series single crystal superalloy and preparation method thereof

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preparation example Construction

[0039] The present invention provides a method for preparing a Ni-Co-Cr single crystal superalloy described in the above scheme, comprising the following steps:

[0040] Corresponding to the element composition of the Ni-Co-Cr single crystal superalloy, melting and refining each preparation raw material to obtain a master alloy ingot;

[0041] preparing the master alloy ingot into a single crystal alloy by using a seed crystal method;

[0042] performing solid solution treatment on the single crystal alloy to obtain a solid solution alloy;

[0043] The solid solution alloy is subjected to aging treatment to obtain a Ni-Co-Cr single crystal superalloy.

[0044] The invention corresponds to the element composition of the Ni-Co-Cr single crystal high-temperature alloy, smelting and refining each preparation raw material to obtain a master alloy ingot.

[0045] In the present invention, the preparation raw materials preferably include elemental Ni, elemental Ti, elemental Cr, Ni...

Embodiment 1

[0064] The Ni, Ti particles and Cr flakes (mass ratio: 15:2:4) with a purity of 99.9% are polished to remove scale, then weighed, cleaned, and dried, and then smelted in a non-consumable arc melting furnace, repeated Melted 6 times to obtain a Φ50*12mm Ni-Cr-Ti master alloy button ingot with uniform element distribution;

[0065] According to the ratio of the constituent elements in Table 1, the selected raw materials are Ni-W master alloy ingot, Ni-Cr-Ti master alloy ingot, and Ni, Co, Al particles with a purity of 99.9%, which are polished to remove scale, weighed, Cleaning, drying, smelting in a vacuum induction melting furnace, high-temperature refining for 5 minutes, slowly cooling down to the solidification of the alloy liquid, and then slowly raising the temperature for the second high-temperature refining, and repeating this three times. After the third refining, when the temperature drops Casting is carried out at 1550°C to obtain a Φ30*100mm master alloy ingot with u...

Embodiment 2～4 and comparative example 1

[0070] The element composition is shown in Table 1, and the preparation method is the same as in Example 1 to obtain a superalloy.

[0071] The element composition (at%) of table 1 embodiment and comparative example

[0072] alloy Ni co Cr Al Ti W Fe Example 1 51.5 20 12 7.5 7.5 1.5 0 Example 2 44 20 15 7.5 7.5 2 0 Example 3 50.2 19 13 7 9 1.8 0 Example 4 47.5 20 15 7.5 8 2 0 Comparative example 1 48 17 9 9 6 3 8

[0073] The configuration entropy of embodiment 1, embodiment 2, embodiment 3, embodiment 4 and comparative example 1 is respectively 1.37R, 1.43R, 1.40R, 1.42R and 1.56R, therefore, embodiment 1~4 belongs to middle Entropy alloy, comparative example 1 belongs to high entropy alloy.

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Abstract

The invention provides a Ni-Co-Cr series single crystal superalloy and a preparation method thereof, and belongs to the technical field of nickel-based superalloys. The Ni-Co-Cr series single crystal superalloy provided by the invention comprises the following elements in atomic percent: 6-8% of Al, 7-9% of Ti, more than or equal to 13% and less than or equal to 17% of Al + Ti, 12-15% of Cr, 18-23% of Co, 1.5-2% of W and the balance being Ni. In phase composition, the Ni-Co-Cr series single crystal superalloy comprises a gamma matrix and a gamma' phase, and a volume fraction of the gamma' phase is 60-63%. According to the Ni-Co-Cr series single crystal superalloy provided by the invention, the volume fraction of the gamma' phase is relatively high, grain boundaries are eliminated, and high-temperature performance of the alloy is improved.

Description

technical field [0001] The invention relates to the technical field of nickel-based superalloys, in particular to a Ni-Co-Cr single crystal superalloy and a preparation method thereof. Background technique [0002] Nickel-based superalloys are widely used in the aerospace field because of their excellent high-temperature mechanical properties, structural stability and thermal corrosion resistance. In order to further improve its high temperature performance, the current main method is to increase the content of refractory elements in the alloy, such as Mo, W, Re, etc. However, the higher content of refractory elements leads to the precipitation of brittle topological close-packed phase (TCP phase) in the alloy during service, which damages the mechanical properties of the alloy, and also increases the density and cost of the alloy. [0003] High-entropy superalloys (that is, high-entropy alloys strengthened by the γ′ phase), because their structures are similar to tradition...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C30/00C30B29/52C22F1/10C30B33/02C30B15/36
CPCC22C19/05C22C30/00C30B29/52C22F1/10C30B33/02C30B15/36C22C2200/00
Inventor 杨文超纵华靖杨晨屈鹏飞刘林张军苏海军黄太文郭敏
Owner NORTHWESTERN POLYTECHNICAL UNIV
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