Stable gamma' phase intensified Co-Ni-V-Al-base high temperature alloy

A co-ni-v-al, superalloy technology, applied in the field of Co-Ni-V-Al-based superalloys, can solve the problems of poor high temperature microstructure stability, increase alloy density, unfavorable applications in the aviation field, etc., and achieve excellent high temperature Tissue stability, effect of low density

Active Publication Date: 2019-01-15
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] (1) Kobayashi [2-4] The research results of et al. showed that in the Co-Al-W ternary alloy, the γ′-Co 3 The (Al,W) precipitated phase is a metastable phase. After a Co-Al-W alloy with a γ/γ′ two-phase structure is kept at 900°C for a long time, the γ′-Co 3 (Al,W) precipitates will decompose to form CoAl and Co 3 W phase, the high temperature structure stability of the alloy is poor
[0009] (2) Bocchini [5-6] The research results of et al. showed

Method used

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  • Stable gamma' phase intensified Co-Ni-V-Al-base high temperature alloy
  • Stable gamma' phase intensified Co-Ni-V-Al-base high temperature alloy
  • Stable gamma' phase intensified Co-Ni-V-Al-base high temperature alloy

Examples

Experimental program
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Example Embodiment

[0039] Example 1:

[0040] Weigh high-purity Co, Ni, V and Al elemental materials according to the composition ratio shown in alloys 1, 2, 3, and 4 in Table 1; put the above-mentioned high-purity elemental materials weighed into an electric arc melting furnace, and In the atmosphere, the current is gradually increased to 50-300A, so that the raw materials are melted evenly, and melted into a Co-based superalloy ingot; in a high-purity argon atmosphere, the above-mentioned cast material is placed in a solid solution treatment at 1200 ° C for 12 hours, and quenched in ice water; Then aging treatment at 900° C. for 48 hours, and quenching in ice water to obtain a Co-Ni-V-Al-based superalloy strengthened by the steady-state γ′ phase.

Example Embodiment

[0041] Example 2:

[0042] Weigh high-purity elemental materials such as Co, Ni, V, and Al according to the composition ratio shown in alloy 6 and 20 in Table 1; put the above-mentioned high-purity elemental materials weighed into an electric arc melting furnace, and gradually Increase the current to 50-300A, so that the raw materials are smelted evenly, and smelted into a Co-based superalloy ingot; in a high-purity argon atmosphere, put the above-mentioned cast material at 1200°C for solution treatment for 12 hours, and quench it in ice water; Aging treatment at ℃ for 45 hours, followed by quenching in ice water, a Co-Ni-V-Al-based superalloy strengthened by the steady-state γ′ phase was obtained.

[0043] figure 2 Shown are the microstructure images of alloys of the present invention after solution treatment at 1200°C for 12 hours, quenching in ice water, and aging at 900°C for 45 hours: (a) Alloy 6 and (b) Alloy 20.

Example Embodiment

[0044] Example 3:

[0045] Weigh high-purity elemental materials such as Co, Ni, V, and Al according to the composition ratio shown in alloy 9 and 23 in Table 1; put the above-mentioned high-purity elemental materials weighed into an electric arc melting furnace, and gradually Increase the current to 50-300A, so that the raw materials are smelted evenly, and smelted into a Co-based superalloy ingot; in a high-purity argon atmosphere, put the above-mentioned cast material at 1200°C for solution treatment for 12 hours, and quench it in ice water; After aging treatment at ℃ for 4000 hours and ice-water quenching, a Co-Ni-V-Al-based superalloy strengthened by the steady-state γ′ phase is obtained.

[0046] image 3 Shown are the microstructure images of alloys of the present invention after solution treatment at 1200°C for 12 hours, quenching in ice water, and aging at 900°C for 4000 hours: (a) Alloy 9 and (b) Alloy 23.

[0047] Figure 4 Shown are typical DSC heating curves fo...

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Abstract

The invention discloses a stable gamma' phase intensified Co-Ni-V-Al-base high temperature alloy. Co, Ni, V and Al are necessary elements, and chemical components of the stable gamma' phase intensified Co-Ni-V-Al-base high temperature alloy include, by atomic percent, 30%-40% of Ni, 1%-10% of V, 8%-14% of Al, 0%-6% of Ta, 0%-4% of Ti and the balance Co. The stable gamma' phase intensified Co-Ni-V-Al-base high temperature alloy is composed of a basal body gamma phase and a gamma'-Co3(V, Al) phase provided with an L12 crystal structure, and gamma separated phases are evenly distributed in the gamma basal body phase in a spherical shape or a cubic shape. Due to the fact that the alloy does not contain W elements or other high-ratio heavy elements, the density of the alloy is remarkably lowerthan that of a Co-Al-W-base alloy. In addition, when the alloy is preserved at the temperature of 900 DEG C for 4,000 hours, gamma/gamma' two phase tissue can still be acquired, and it shows that theintensifying phase in the alloy is the thermodynamic stable phase.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a Co-Ni-V-Al-based superalloy with a γ / γ′ two-phase structure and γ′ as a thermodynamic stable phase. Background technique [0002] Superalloys are key materials in the aerospace field, and the high-temperature materials widely used in this field are Ni-based superalloys. In aero-engines, high-temperature alloys account for about 50% of the total engine materials. Therefore, in a sense, the development of the aviation industry depends on the development of new high-temperature alloy materials. However, the current service temperature of nickel-based superalloys is close to its melting point, and the improvement of its temperature bearing capacity is extremely limited. The microstructure of nickel-based superalloys is characterized by uniform distribution of ordered L1 in the face-centered cubic structure of the γ matrix phase 2 γ′-Ni 3 Al precipitated phase. In 2006, Ishi...

Claims

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Application Information

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IPC IPC(8): C22C19/07C22C30/00C22C1/02C22F1/10
CPCC22C1/02C22C19/03C22C19/07C22C30/00C22F1/10
Inventor 王翠萍刘兴军陈悦超杨水源卢勇韩佳甲张锦彬黄艺雄郭毅慧
Owner XIAMEN UNIV
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