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A nickel-based superalloy with high structural stability and its preparation method

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

Active Publication Date: 2022-01-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A nickel-based superalloy with high structural stability and its preparation method
  • A nickel-based superalloy with high structural stability and its preparation method
  • A nickel-based superalloy with high structural stability and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Alloy compositions shown in Table 1 according to a scale of high purity Ni, Al, Co, Cr, Mo, Re, Ru, Ta, W and other elemental metal, the metal material described above was weighed placed in a vacuum arc melting furnace, carried out in high purity alloy melting in an argon atmosphere, melting in the arc current magnitude control 350A, until the alloy is completely liquefied held for 1 minute, and then cooled off to the alloy is completely solidified. In the high purity argon gas atmosphere, the lower nickel-based superalloy ingot prepared in the above solution temperature of 1320 ℃; 12 times repeating the melting step, to ensure uniformity of the alloy, to give a final nickel-base superalloy ingots for 24 h, cooled, and then incubated for 4h at 1150 ℃, air-cooled, and then incubated 24h at 870 deg.] C, cooled to give a nickel-based superalloy of high structural stability. like figure 1 , A typical morphology of the alloy in Example 1 is a scanning electron micrograph embodim...

Embodiment 2

[0041] Table 1 Alloy composition according weighed 2 high purity Ni, Al, Co, Cr, Mo, Re, Ru, Ta, W and other elemental metal, the metal material described above was weighed placed in a vacuum arc melting furnace, carried out in high purity alloy melting in an argon atmosphere, melting in the arc current magnitude control 350A, until the alloy is completely liquefied held for 1 minute, and then cooled off to the alloy is completely solidified. In the high purity argon gas atmosphere, the lower nickel-based superalloy ingot prepared in the above solution temperature of 1330 ℃; 12 times repeating the melting step, to ensure uniformity of the alloy, to give a final nickel-base superalloy ingots incubated for 10 hours and cooled, followed by incubation for 4h at 1100 ℃, air-cooled, and then incubated 16h at 870 deg.] C, cooled to give a nickel-based superalloy of high structural stability. like Figure 4 , A typical morphology of Example 2 of the alloy of the present invention is a scan...

Embodiment 3

[0043] Table 1 Alloy composition according to the high purity weighed 3 Ni, Al, Co, Cr, Mo, Re, Ru, Ta, W and other elemental metal, the metal material described above was weighed placed in a vacuum arc melting furnace, carried out in high purity alloy melting in an argon atmosphere, melting in the arc current magnitude control 350A, until the alloy is completely liquefied held for 1 minute, and then cooled off to the alloy is completely solidified. In the high purity argon gas atmosphere, the lower nickel-based superalloy ingot prepared in the above solution temperature of 1330 ℃; 10 times repeating the melting step, to ensure uniformity of the alloy, to give a final nickel-base superalloy ingots incubated for 16 hours and cooled, followed by incubation for 4h at 1150 ℃, air-cooled, and then incubated 23h at 870 deg.] C, cooled to give a nickel-based superalloy of high structural stability. like Image 6 Typical morphology of the SEM image, gamma] Example 3 Alloy embodiment shown,...

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Abstract

The invention discloses a nickel-based superalloy with high structural stability and a preparation method thereof, belonging to the field of superalloys, and its chemical composition is calculated by weight percentage: Al: 5.8-6.5%, W: 1-2%, Co: 8 ~9%, Cr: 3~4%, Mo: 1~2%, Re: 6.8~7.2%, Ru: 2.8~3.2%, Ta: 8~9%, the balance Ni, and 9.6%≤Re+Ru ≤10%. In the present invention, solution heat treatment is carried out at 1300-1330°C, and graded aging treatment is carried out at 1100-1150°C and 850-870°C. The alloy of the present invention has a γ / γ′ two-phase structure, and after 1150°C / 100 hours of heat exposure, γ′ still maintains a cubic shape, the aspect ratio of γ′ is between and , the thickness of γ′ is less than 0.8 microns, and the volume of γ′ is The fraction is greater than 50%, no harmful phase TCP is precipitated, and has good high-temperature structural stability.

Description

Technical field [0001] The present invention belongs to the technical field of high-temperature alloys, nickel-based superalloy, and relates to a method for preparing a high structural stability. Background technique [0002] Nickel base single crystal superalloy having excellent high-temperature overall performance, the preferred material is advanced aerospace engine high pressure turbine blade. In recent years, with the improvement of prior aeroengine turbine inlet temperature, a moderate load bearing capacity of the nickel-base single crystal superalloy is a higher requirement of modern superalloys thus adding a large number of refractory elements (such as Re, Mo, Ta, W, etc.) alloyed, compared with other conventional structural materials, which is very high degree of alloying. Therefore, from the thermodynamic point of view, it is a complex non-equilibrium alloy system, the temperature field in the complex / stress field during long-term service γ / γ 'two-phase microstructur...

Claims

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Application Information

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Patent Type & Authority Patents(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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