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A third-generation nickel-based single crystal superalloy that strengthens the γ′ phase and its preparation method

A high-temperature alloy and nickel-based single crystal technology, applied in the field of materials, can solve the problems of high cost, saturated content of refractory elements, unstable microstructure, etc., and achieve the effect of reducing alloy cost and low Re content

Active Publication Date: 2021-09-17
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems of high cost, saturated content of refractory elements and unstable microstructure existing in the prior art, the present invention proposes a third-generation nickel-based single crystal superalloy that strengthens the γ′ phase and its preparation method

Method used

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  • A third-generation nickel-based single crystal superalloy that strengthens the γ′ phase and its preparation method
  • A third-generation nickel-based single crystal superalloy that strengthens the γ′ phase and its preparation method
  • A third-generation nickel-based single crystal superalloy that strengthens the γ′ phase and its preparation method

Examples

Experimental program
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Effect test

preparation example Construction

[0055] The preparation process of the Ni-W master alloy adopts the existing technology, specifically: mix the W and Ni and load the furnace, a total of 25kg, vacuumize the melting furnace and fill it with argon, turn on the melting power supply, and then Increase the power to 100kw within 15 minutes, increase the power to 120kw after 5 minutes, and increase the power to 140kw after another 5 minutes. After the alloy is melted, reduce the power of the melting power supply to reduce the melt temperature to 1600°C. Refining for 5 minutes, then continue to reduce the power supply, and start casting when the temperature of the melt drops to 1500°C. Take it out after cooling, and thus obtain a Ni-W master alloy.

[0056] The components of each embodiment are shown in Table 1.

[0057] Table 1, unit: wt%

[0058]

[0059] For the convenience of comparison, the chemical compositions of typical third-generation nickel-based single crystal superalloys CMSX-10K, CMSX-10Ri, TMS-75 an...

Embodiment 1

[0088] The microstructure after the complete heat treatment of embodiment 1 alloy is as follows: figure 1 As shown, the heat treatment system of the present invention is used to sufficiently diffuse the elements, and the cubic γ′ phase with a size of 0.3-0.5 mm is precipitated, and the distribution is uniform and the arrangement is regular.

[0089] The tensile and creep properties of nickel-based single crystal superalloy samples were tested after complete heat treatment. Compared figure 2 The tensile curve 1 of the alloy in Example 1 at 20°C, the tensile curve 2 of the alloy in Example 1 at 760°C, the tensile curve 3 of the alloy in Example 1 at 980°C, and the tensile curve 3 of the alloy in Example 1 The tensile curve 4 of the alloy at 1100°C shows that when the experimental temperature rises from 20°C to 760°C, both the yield strength and tensile strength of the alloy in Example 1 increase, especially the tensile strength of the alloy increases significantly. At 980℃ an...

Embodiment 7

[0102] The properties of Example 7 under different creep conditions are shown in Table 9.

[0103] The creep properties of the third-generation nickel-based single crystal superalloy obtained in Table 9 Example 7

[0104] Creep condition Creep life h Elongation% Larson-Miller parameter P 1100℃ / 150MPa 83.6 24.91 30.10 1100℃ / 150MPa 89.4 26.57 30.14 980℃ / 350MPa 68.8 39.42 27.36 760℃ / 800MPa 220.2 25.46 23.08

[0105] Table 10 Creep performance of Example 12 at 1100°C / 150MPa

[0106] Creep condition Creep life h Elongation% Larson-Miller parameter P 1100℃ / 150MPa 78.31 21.69 30.06 1100℃ / 150MPa 81.74 9.71 30.08

[0107] Table 11 Creep performance of Example 4 at 1100°C / 150MPa

[0108] Creep condition Creep life h Elongation% Larson-Miller parameter P 1100℃ / 150MPa 46.77 28.62 29.75 1100℃ / 150MPa 38.08 33.95 29.63

[0109] Figure 4 Among them, the proportion o...

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Abstract

A third-generation nickel-based single-crystal superalloy strengthened by the γ' phase and a preparation method thereof. The third-generation nickel-based single-crystal superalloy that strengthens the γ' phase is composed of Al, Ta, W, Re, Mo, Cr, Co, Hf and Ni. The proportion x of the Ta element in the γ′ forming elements Al and Ta is 0.1283-0.2282. W element is added in the form of Ni-W alloy. Through solution treatment, high-temperature aging treatment and low-temperature aging treatment, the third-generation nickel-based single crystal superalloy with strengthened γ' phase is obtained. The invention has high medium and high temperature strength, good instantaneous tensile performance and creep performance, and the content of rare and precious element Re in the alloy is low, which greatly reduces the cost of the alloy.

Description

technical field [0001] The invention relates to the field of materials, in particular to a third-generation nickel-based single-crystal superalloy that strengthens the γ' phase and a preparation method thereof. Background technique [0002] Superalloys refer to high-alloyed iron-based, cobalt-based or nickel-based austenitic metal materials that can withstand large complex stresses at high temperatures above 600 °C and have surface stability. Nickel-based single crystal superalloys have high high-temperature strength, excellent creep and fatigue resistance, good oxidation resistance and corrosion resistance, and are widely used in hot end parts of aero engines and gas turbines. [0003] The γ′ phase is a strengthening phase in nickel-based single crystal superalloys, and it is a Ni with a face-centered cubic structure. 3 Al-type intermetallic compounds, their own physical parameters, size, volume fraction and microstructure jointly determine the mechanical properties of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C1/03C22F1/10C22F1/02C30B29/52C30B11/00C30B33/02
CPCC22C1/023C22C1/03C22C19/057C22F1/02C22F1/10C30B11/00C30B29/52C30B33/02
Inventor 黄太文李卓然刘林张军王博苏海军杨文超郭敏
Owner NORTHWESTERN POLYTECHNICAL UNIV
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