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Cubic γ′ Nanoparticle Coherent Precipitation Strengthened Superalloy with Stable Structure at 900°C and Preparation Method

A nanoparticle and superalloy technology, applied in the field of Co-based superalloys, can solve the problems of deteriorating the mechanical properties of the alloy, destroying the coherent relationship, large lattice distortion, etc., achieving excellent oxidation resistance, improving mechanical properties, high-temperature microstructure The effect of stability

Active Publication Date: 2022-05-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with high temperature stable γ′-Ni 3 Unlike Al, the metastable γ′-Co 3 The (Al,W) phase is easily decomposed into FCC-γ, β-CoAl, and χ-Co during the aging process at a high temperature of 900 °C and above. 3 W and μ-Co 7 W 6 Stable phase, because the crystal structure of the precipitated phase changes, which will destroy the original γ / γ′ coherent relationship; and there is a large lattice distortion between these stable precipitated phases and the matrix, during the dislocation movement process It is easy to generate stress concentration, which induces crack initiation and deteriorates the mechanical properties of the alloy

Method used

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  • Cubic γ′ Nanoparticle Coherent Precipitation Strengthened Superalloy with Stable Structure at 900°C and Preparation Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: Co-22.6Ni-2.6Al-17.7W-1.5Ti-0.7Nb-1.5Ta-2.5Cr (wt.%) alloy

[0021] Step 1: Alloy Preparation

[0022] High-purity metal materials are used, and ingredients are prepared according to mass percentage. The ingredients are smelted at least four times in a vacuum non-consumable arc melting furnace under the protection of an argon atmosphere to obtain an alloy ingot with a uniform composition and a mass of about 120 g, and the mass loss during the smelting process does not exceed 0.1%. The alloy ingot is subjected to solution treatment at 1300°C / 15h in a muffle furnace, water quenching, and the purpose of solution treatment is to reduce or eliminate the composition segregation of the structure and dissolve the inhomogeneous precipitated phase; followed by 500h at 900°C Aging treatment, water quenching.

[0023] Step 2: Alloy structure and mechanical properties test

[0024] Using OM, SEM and XRD to detect the microstructure and structure of the alloy after a...

Embodiment 2

[0025] Embodiment 2: Co-28.2Ni-2.6Al-17.7W-1.5Ti-0.7Nb-1.5Ta-2.5Cr (wt.%) alloy

[0026] Step 1: Alloy Preparation

[0027] High-purity metal materials are used, and ingredients are prepared according to mass percentage. The ingredients are smelted at least four times in a vacuum non-consumable arc melting furnace under the protection of an argon atmosphere to obtain an alloy ingot with a uniform composition and a mass of about 120 g, and the mass loss during the smelting process does not exceed 0.1%. The alloy ingot is subjected to solution treatment at 1300°C / 15h in a muffle furnace, water quenching, and the purpose of solution treatment is to reduce or eliminate the composition segregation of the structure and dissolve the inhomogeneous precipitated phase; followed by 10h at 900°C Aging treatment, water quenching.

[0028] Step 2: Alloy structure and mechanical properties test

[0029] Utilize OM, SEM and XRD to detect the microstructure and structure of the alloy after ...

Embodiment 3

[0030] Embodiment 3: Co-22.6Ni-2.6Al-17.7W-1.5Ti-0.8Nb-1.5Ta-5.1Cr (wt.%) alloy

[0031] Step 1: Alloy Preparation

[0032] Use high-purity metal materials, and carry out batching according to mass percentage. The ingredients are smelted at least four times in a vacuum non-consumable arc melting furnace under the protection of an argon atmosphere to obtain an alloy ingot with a uniform composition and a mass of about 120 g, and the mass loss during the smelting process does not exceed 0.1%. The alloy ingot is subjected to solution treatment at 1300°C / 15h in a muffle furnace, water quenching, and the purpose of solution treatment is to reduce or eliminate the composition segregation of the structure and dissolve the inhomogeneous precipitated phase; followed by 100h at 900°C Aging treatment, water quenching.

[0033] Step 2: Alloy structure, mechanical properties and corrosion resistance test

[0034] Utilize OM, SEM and XRD to detect the microstructure and structure of the ...

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Abstract

The invention provides a coherent precipitation-strengthened superalloy of cubic γ' nanoparticles with a stable structure at 900°C and a preparation method thereof, belonging to the field of Co-based superalloys, including Co, Ni, Al, W, Mo, Ti, Nb, Ta , Cr element, the mass percentage (wt.%) of its alloy composition is, Ni: 22.6-28.2, Al: 2.6-4.2, W: 9.1-17.7, Mo: 0-5.0, Ti: 1.2-1.5, Nb: 0 ~2.4, Ta: 0~4.6, Cr: 2.4~5.1, Co: balance. The present invention realizes the coherent precipitation of cubic γ′ nanoparticles on the γ matrix through alloy composition design, and the γ′ nanoparticles can exist stably for a long time at 900°C, so that the alloy has good high-temperature mechanical properties and excellent oxidation resistance properties, corrosion resistance and thermal corrosion resistance; in addition, the preparation process of the present invention is simple, and it is a new superalloy with good application prospects in the aerospace field.

Description

technical field [0001] The invention belongs to the field of Co-based superalloys, and relates to a coherent precipitation-strengthened Co-Ni-Al-W / Mo-Cr-Ti / Nb / Ta superalloy with a stable structure at 900°C and a preparation method thereof . Background technique [0002] Due to their excellent mechanical properties and creep resistance at high temperatures, superalloys are used in the fields of aerospace engines and industrial gas turbines, among which there is a cubic ordered γ′(L1 2 -Ni 3 Al structure) nanoparticles coherently precipitated on the face-centered cubic FCC-γ matrix Ni-based superalloys are the most widely used. However, with the continuous development of aerospace technology in recent years, the service temperature of Ni-based superalloys has approached its melting point, and it is difficult to continue to meet actual needs. Compared with Ni element, Co element has a higher melting point and better resistance to hot corrosion, so Co-based superalloys have b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/07C22C30/00C22F1/10C22C1/02
CPCC22C19/07C22C30/00C22F1/10C22C1/02
Inventor 王清李金临董闯吕梦甜
Owner DALIAN UNIV OF TECH
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