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

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...

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