A kind of ni-co-cr series single crystal superalloy and preparation method thereof

A ni-co-cr, superalloy technology, applied in the field of nickel-based superalloys, can solve the problems of reducing γ' phase strengthening effect, incoherent interface stress concentration, consumption of γ' phase forming elements, etc., and achieve excellent microstructure stability. properties, increasing volume fraction, and excellent high-temperature mechanical properties

Active Publication Date: 2022-05-24
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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  • A kind of ni-co-cr series single crystal superalloy and preparation method thereof
  • A kind of ni-co-cr series single crystal superalloy and preparation method thereof
  • A kind of ni-co-cr series single crystal superalloy and preparation method thereof

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preparation example Construction

[0039] The present invention provides the preparation method of the Ni-Co-Cr series single crystal superalloy according to the above scheme, comprising the following steps:

[0040] Corresponding to the elemental composition of the Ni-Co-Cr series single crystal superalloy, each prepared raw material is smelted and refined to obtain a master alloy ingot;

[0041] Using the seed crystal method to prepare the master alloy ingot into a single crystal alloy;

[0042] performing 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-based single crystal superalloy.

[0044] According to the element composition of the Ni-Co-Cr series single crystal superalloy, in the present invention, each preparation raw material is smelted and refined to obtain a master alloy ingot.

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

Embodiment 1

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

[0065] According to the composition element ratio in Table 1, the selected raw materials are Ni-W master alloy ingots, Ni-Cr-Ti master alloy ingots, Ni, Co, and Al particles with a purity of 99.9%. Cleaning, drying, smelting in a vacuum induction melting furnace, refining at high temperature for 5 minutes, slowly cooling down until the alloy liquid solidifies, and then slowly heating up for the second high-temperature refining, repeated three times, after the third refining, when the temperature decreases When the temperature reaches 1550 °C, casting is performed to obtain a Φ30*100mm master alloy ingot with uniform element distribution;

[00...

Embodiment 2～4 and comparative example 1

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

[0071] Table 1 Elemental composition (at%) of Examples and Comparative Examples

[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 Example 1, Example 2, Example 3, Example 4 and Comparative Example 1 are 1.37R, 1.43R, 1.40R, 1.42R and 1.56R, respectively. Therefore, Examples 1 to 4 belong to the middle Entropy alloy, Comparative Example 1 belongs to high entropy alloy.

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Abstract

The invention provides a Ni-Co-Cr single crystal superalloy and a preparation method thereof, belonging to the technical field of nickel-based superalloys. The Ni-Co-Cr single crystal superalloy provided by the present invention includes the following atomic percentage elements: Al 6-8%, Ti 7-9%, 13%≤Al+Ti≤17%, Cr 12-15%, Co 18~23%, W 1.5~2% and Ni of the balance; In terms of phase composition, the Ni-Co-Cr single crystal superalloy includes a γ matrix and a γ′ phase, and the volume fraction of the γ′ phase is 60-63%. The Ni-Co-Cr single-crystal superalloy provided by the invention has a relatively high γ' phase volume fraction, eliminates grain boundaries and improves the high-temperature performance of the alloy.

Description

technical field [0001] The invention relates to the technical field of nickel-based superalloys, in particular to a Ni-Co-Cr series single crystal superalloy and a preparation method thereof. Background technique [0002] Nickel-based superalloys are widely used in aerospace because of their excellent high-temperature mechanical properties, microstructure stability, and thermal corrosion resistance. In order to further improve its high temperature performance, the main method at present is to increase the content of refractory elements in the alloy, such as Mo, W, Re, etc. However, high content of refractory elements leads to the precipitation of brittle topologically close-packed phase (TCP phase) 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 γ' phase) are similar in structure to traditional nickel-based superalloys, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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