High-structure-stability nickel-based high-temperature alloy and preparation method thereof

A nickel-based high-temperature alloy, stability technology, applied in the field of high-temperature alloys, to achieve the effect of less addition, good high-temperature creep performance, and strong structural stability

Active Publication Date: 2021-05-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, in order to ensure high temperature mechanical properties, the addition of Re and Ru is inevitable, but the current alloying method is to increase the upper limit of TCP phase promoting elements Re, Mo, etc. by greatly increasing the content of Ru element. Considering Re The cost and density of Ru element, this kind of alloying idea is difficult to continue to develop

Method used

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  • High-structure-stability nickel-based high-temperature alloy and preparation method thereof
  • High-structure-stability nickel-based high-temperature alloy and preparation method thereof
  • High-structure-stability nickel-based high-temperature alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0039] Weigh high-purity elemental metals such as Ni, Al, Co, Cr, Mo, Re, Ru, Ta, W, etc. according to the composition shown in alloy 1 in Table 1, and place the above-mentioned weighed metal raw materials in a vacuum arc melting furnace. The alloy is smelted under the protection of high-purity argon, and the current of the melting arc is controlled at 350A. After the alloy is completely liquefied, it is kept for 1 minute, and then the power is turned off and cooled until the alloy is completely solidified. Repeat the above-mentioned smelting steps 12 times to ensure the uniformity of the alloy, and finally obtain a nickel-based superalloy ingot; Heat preservation for 24 hours, air cooling, then heat preservation at 1150°C for 4 hours, air cooling, then heat preservation at 870°C for 24 hours, air cooling, to obtain a nickel-based superalloy with high structural stability. Such as figure 1 As shown in the scanning electron micrograph of the typical microstructure of the alloy...

Embodiment 2

[0041] Weigh high-purity elemental metals such as Ni, Al, Co, Cr, Mo, Re, Ru, Ta, W, etc. according to the composition shown in alloy 2 in Table 1, and place the above-mentioned weighed metal raw materials in a vacuum arc melting furnace. The alloy is smelted under the protection of high-purity argon, and the current of the melting arc is controlled at 350A. After the alloy is completely liquefied, it is kept for 1 minute, and then the power is turned off and cooled until the alloy is completely solidified. Repeat the above smelting steps 12 times to ensure the uniformity of the alloy, and finally obtain a nickel-based superalloy ingot; Heat preservation for 10 hours, air cooling, then heat preservation at 1100°C for 4 hours, air cooling, then heat preservation at 870°C for 16 hours, air cooling, to obtain a nickel-based superalloy with high structural stability. Such as Figure 4 As shown in the scanning electron micrograph of the typical microstructure of the alloy in Examp...

Embodiment 3

[0043] Weigh high-purity elemental metals such as Ni, Al, Co, Cr, Mo, Re, Ru, Ta, W, etc. according to the composition shown in alloy 3 in Table 1, and place the above-mentioned weighed metal raw materials in a vacuum arc melting furnace. The alloy is smelted under the protection of high-purity argon, and the current of the melting arc is controlled at 350A. After the alloy is completely liquefied, it is kept for 1 minute, and then the power is turned off and cooled until the alloy is completely solidified. Repeat the above-mentioned smelting steps 10 times to ensure the uniformity of the alloy, and finally obtain a nickel-based superalloy ingot; Heat preservation for 16 hours, air cooling, then heat preservation at 1150°C for 4 hours, air cooling, then heat preservation at 870°C for 23 hours, air cooling, to obtain a nickel-based superalloy with high structural stability. Such as Image 6 Shown is the scanning electron micrograph of the typical microstructure of the alloy of...

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Abstract

The invention discloses a high-structure-stability nickel-based high-temperature alloy and a preparation method thereof, and belongs to the field of high-temperature alloys. Chemical components of the high-structure-stability nickel-based high-temperature alloy comprise, by weight, 5.8-6.5% of Al, 1-2% of W, 8-9% of Co, 3-4% of Cr, 1-2% of Mo, 6.8-7.2% of Re, 2.8-3.2% of Ru, 8-9% of Ta and the balance Ni, and the sum of Re and Ru is greater than or equal to 9.6% and less than or equal to 10%. Solid solution heat treatment is carried out at the temperature of 1300-1330 DEG C, and graded aging treatment is carried out at the temperature of 1100-1150 DEG C and at the temperature of 850-870 DEG C. The alloy has a gamma / gamma' two-phase structure, gamma' is still kept in a cubic shape after heat exposure at 1150 DEG C for 100 hours, the length-width ratio of gamma' is within the range (please see the range in the specification), the thickness of gamma' is smaller than 0.8 micrometer, the volume fraction of gamma' is larger than 50%, no harmful phase TCP is separated out, and good high-temperature structure stability is achieved.

Description

technical field [0001] The invention belongs to the technical field of superalloys, and relates to a nickel-based superalloy with high structural stability and a preparation method thereof. Background technique [0002] Nickel-based single crystal superalloys have excellent high-temperature comprehensive properties and are the preferred materials for advanced aero-engine high-pressure turbine blades. In recent years, with the increase of the inlet temperature of the aero-engine turbine, higher requirements have been placed on the bearing and load-bearing capacity of nickel-based single crystal superalloys. Therefore, a large number of refractory elements (such as Re, Mo, Ta, W, etc.) for alloying, compared with other traditional structural materials, its alloying degree is very high. Therefore, from a thermodynamic point of view, it is a non-equilibrium complex alloy system. Under the complex temperature field / stress field, the γ / γ′ two-phase microstructure will inevitably ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05
CPCC22C19/057
Inventor 李龙飞韩宏泳冯强
Owner UNIV OF SCI & TECH BEIJING
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