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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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

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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Example Embodiment

[0039] The present invention provides a method of preparing a Ni-CR-CR-CR-CR-CR-Crystalline high-temperature alloy according to the above scheme, including the following steps:

[0040] The elements of the Ni-Co-Cr system single crystal high temperature alloy are composed, and each prepared material is melted and refined, and the mother isotonic ingot;

[0041] The mothermium alloy was prepared by the seed crystal method;

[0042] The single crystal alloy was subjected to a solution to obtain a solid solution alloy;

[0043] The solid solution alloy was taken agreed to obtain a Ni-Co-Cr system single crystal high temperature alloy.

[0044] The present invention corresponds to the element of the Ni-Co-Cr single crystal high temperature alloy, and each prepared material is melted and refined, resulting in a master myrot.

[0045] In the present invention, the preparation raw material preferably includes a single tissue Ni, a single tissue Ti, a monosyl CR, a Ni-W intermediate alloy...

Example Embodiment

[0063] Example 1

[0064] The purity of 99.9% Ni, Ti particles, and the Cr sheet (mass ratio of 15: 2: 4) were grinded to remove the oxidation and then weighed, washed, dried, and then used as a non-self-consuming arc smelting furnace to smelt. Slim 6 times, resulting in a uniform element distribution φ50 * 12 mm Ni-Cr-Ti intermediate alloy button;

[0065] According to the composition element ratio of Table 1, the selected raw material is Ni-W intermediate alloy ingot, Ni-Cr-Ti intermediate alloy ingot, purity of 99.9% Ni, Co, Al particles, and drying the oxidized skin, weighing, Cleaning, drying, using a vacuum induced smelting furnace, high temperature refining 5 min, slowly cooling to alloy liquid solidified, then slowly warming the second high temperature refining, so repeated three times, after the third refining, when the temperature is lowered When it is 1550 ° C, the casting is carried out to obtain a φ30 * 100 mm mother-binding ingot distributed evenly.

[0066] Using an...

Example

[0069] Example 2 to 4 and Comparative Example 1

[0070] Elemental composition See Table 1, the preparation method is the same as in Example 1 to give a high temperature alloy.

[0071] Table 1 Embodiments and contrast elements composition (AT%)

[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 Contrast 1 48 17 9 9 6 3 8

[0073] Example 1, Example 2, Example 3, Example 4 and Comparative Example 1 The configuration entropy of 1.37R, 1.43R, 1.40R, 1.42R, 1.56R, respectively,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Entropy alloy, the contrast 1 belongs to the 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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