High cobalt nickel-based high-temperature alloy and preparation method thereof

A technology of nickel-based superalloys and superalloys, applied in the field of superalloys, can solve the problems of inability to achieve comprehensive performance, low Co content addition, and promote the precipitation of TCP harmful phases, so as to ensure notch sensitivity, improve durability, and improve Effect of hot workability

Active Publication Date: 2018-07-24
CENT IRON & STEEL RES INST
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Problems solved by technology

[0004] However, if the content of Co is too high, it will promote the precipitation of TCP harmful phase in the alloy. Therefore, the existing nickel-based superalloys cannot precisely control the composition range of Co in the superalloy on the basis of taking into account the comprehensive performance and phase composition. To improve the overall performance of nickel-based superalloys
[0005] Chinese invention patent application CN101142338A discloses a nickel-based alloy and a method of direct aging heat treatment, however, due to the low addition of Co content, the purpose of high comprehensive performance cannot be achieved

Method used

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

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preparation example Construction

[0060] Specifically, the preparation method of the high-cobalt nickel-based superalloy may include the following steps:

[0061] Step 1: The raw material of the high-cobalt nickel-based superalloy is smelted by vacuum induction smelting and vacuum self-consumption remelting dual smelting processes to obtain alloy ingots.

[0062] Vacuum induction smelting may include the following steps: Weigh the raw materials according to the element ratio of the high-cobalt nickel-based superalloy, add the raw materials into the vacuum induction furnace, and undergo full melting, refining, and impurity removal treatments under vacuum conditions, and then tap the steel to form an alloy Ingots, where the vacuum degree of complete melting is 20Pa~30Pa, the temperature of complete melting is 1510℃~1560℃, the vacuum degree of refining is less than 5Pa, the refining temperature is 1510℃~1560℃, the refining time is more than 100min, and the tapping temperature is 1460℃ ℃~1490℃.

[0063] Vacuum co...

Embodiment 1

[0069] This embodiment provides a nickel-based superalloy for 650°C to 750°C, which includes: carbon: 0.022%, chromium: 17.89%, molybdenum: 2.73%, tungsten: 1.01%, cobalt: 12.0%, iron : 9.62%, niobium: 5.43%, aluminum: 1.63%, titanium: 0.77%, phosphorus: 0.0098%, boron: 0.0043%, and the balance is nickel.

[0070] The preparation method of this alloy is as follows:

[0071] (1) Smelting: Vacuum induction melting and vacuum self-consumption remelting dual smelting processes are adopted, specifically:

[0072]Vacuum induction smelting: Weigh a certain amount of smelting raw materials that can obtain carbon, chromium, molybdenum, tungsten, cobalt, iron, niobium, aluminum, titanium, phosphorus, boron and nickel elements according to the element ratio principle of nickel-based superalloy. The smelting raw materials are put into the vacuum induction furnace, and cast into alloy ingots after full melting, refining, and impurity removal under vacuum conditions; the full melting vacuu...

Embodiment 2

[0077] This embodiment provides a nickel-based superalloy for 650°C to 750°C, which includes: carbon: 0.023%, chromium: 17.88%, molybdenum: 2.78%, tungsten: 1.02%, cobalt: 15.0%, iron : 9.74%, niobium: 5.46%, aluminum: 1.58%, titanium: 0.76%, phosphorus: 0.0097%, boron: 0.0041%, and the balance is nickel.

[0078] The preparation method of this alloy is as follows:

[0079] (1) Smelting: Vacuum induction melting and vacuum self-consumption remelting dual smelting processes are adopted, specifically:

[0080] Vacuum induction smelting: Weigh a certain amount of smelting raw materials that can obtain carbon, chromium, molybdenum, tungsten, cobalt, iron, niobium, aluminum, titanium, phosphorus, boron and nickel elements according to the element ratio principle of nickel-based superalloy. The smelting raw materials are put into a vacuum induction furnace, and cast into alloy ingots after undergoing full melting, refining, and impurity removal treatments under vacuum conditions; t...

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Abstract

The invention discloses a high cobalt nickel-based high-temperature alloy used at 650 to 750 DEG C and a preparation method thereof, and belongs to the technical field of high-temperature alloys. Thedifficult problem about improving the comprehensive performance of the nickel-based high-temperature alloy with the consideration of alloy performance and use cost in the prior art is solved by precisely controlling the component range of Co in the high-temperature alloy. The alloy is prepared from the components in percentage by mass: less than or equal to 0.1 percent of C, 12 to 20 percent of Cr, less than or equal to 4.0 percent of Mo, less than or equal to 6 percent of W, 12.01 to 25.00 percent of Co, less than or equal to 14 percent of Fe, 4.0 to 8.0 percent of Nb, 0.6 to 2.6 percent of Al, 0.4 to 1.4 percent of Ti, 0.003 to 0.03 percent of P, 0.003 to 0.015 percent of B, and the balance of Ni; the content of a gamma' phase is 15 to 30 mass percent; the content of eta-Ni3Al0.5Nb0.5 is0.5 to 10.0 mass percent. The preparation method of the nickel-based high-temperature alloy comprises the processes of smelting, forging and cogging, and performing heat treatment. According to the high cobalt nickel-based high-temperature alloy and the preparation method thereof, the high cobalt nickel-based high-temperature alloy can be used at the temperature of 650 to 750 DEG C.

Description

technical field [0001] The invention relates to the technical field of high-temperature alloys, in particular to a high-cobalt-nickel-based high-temperature alloy for 650°C to 750°C and a preparation method thereof. Background technique [0002] Nickel-based superalloys have excellent comprehensive mechanical properties, oxidation resistance and corrosion resistance, and are a type of superalloy with the highest high-temperature strength. They are widely used in petrochemical, nuclear energy, aviation and other industrial fields. [0003] In the prior art, in order to further improve the overall performance, service temperature, oxidation resistance and hot corrosion resistance of the above-mentioned nickel-based superalloy, cobalt (Co) is usually added to the above-mentioned alloy. The addition of Co can reduce the stacking fault energy, improve the durability and creep properties of higher superalloys, and improve the hot workability of alloys. [0004] However, if the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22C1/02C22F1/10
CPCC22C1/023C22C19/056C22F1/002C22F1/10
Inventor 王民庆杜金辉邓群曲敬龙吕旭东毕中南唐超刘辉吴玉博王知颖荣义杨成斌孟令胜
Owner CENT IRON & STEEL RES INST
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