Medium-temperature high-strength cast nickel-based high-temperature alloy and preparation method and structural part thereof

By adjusting the elemental composition and phase composition of nickel-based high-temperature alloy, a medium-temperature high-strength cast nickel-based high-temperature alloy was designed, which solved the problem of poor low-temperature mechanical properties in existing alloys, achieved excellent medium-low-temperature mechanical properties and casting processability, and was suitable for the overall casting of complex structural parts.

CN119640097AActive Publication Date: 2025-03-18GAONA AERO MATERIAL CO LTD
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Patent Information

Application Number
CN202411973292.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-30
Publication Date
2025-03-18
Estimated Expiration
2044-12-30

AI Technical Summary

Technical Problem

The existing cast nickel-based high-temperature alloys have poor mechanical properties at medium and low temperatures, making it difficult to meet the needs of complex structural components such as integral blades and turbine working blades in the new generation of aero engines.

Method used

By adjusting the types and content of alloy elements, a medium-temperature high-strength cast nickel-based high-temperature alloy was designed, with components including Al 1% to 5%, Ti 5% to 10%, Co 18% to 25%, Cr 7% to 13%, W+Mo 2% to 6%, B 0.07% to 0.2%, Zr < 0.05%, and the balance is Ni, so that the volume fraction of the γ/γ′ eutectic phase and the boride is reasonably controlled.

Benefits of technology

It realizes excellent medium and low temperature mechanical properties of the alloy and good casting processability, meeting the needs of complex structural parts.

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Abstract

The invention relates to the technical field of cast nickel-based superalloys, in particular to a medium-temperature high-strength cast nickel-based superalloy, a preparation method thereof and a structural part. The medium-temperature high-strength cast nickel-based high-temperature alloy comprises the following components in percentage by mass: 1%-5% of Al, 5%-10% of Ti, 18%-25% of Co, 7%-13% of Cr, 2%-6% of W + Mo, 0.07%-0.2% of B, less than 0.05% of Zr and the balance of Ni, the sum of the mass percent of Al and the mass percent of Ti meets the condition that Al + Ti is larger than or equal to 9%; the ratio of the mass percent of Ti to the mass percent of Al is greater than or equal to 1.5 and less than or equal to 4. According to the nickel-based high-temperature alloy disclosed by the invention, the types and contents of alloy elements are regulated and controlled, so that the nickel-based high-temperature alloy disclosed by the invention has excellent medium and low temperature mechanical properties and casting manufacturability.
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