Nickel-based single-crystal high-temperature alloy and preparation method thereof

By optimizing the chemical composition and heat treatment of nickel-based single-crystal superalloys and reducing the γ/γ′ phase interface energy, the limitations of Re-free second-generation single-crystal superalloys in terms of high-temperature strength and microstructure stability have been overcome, realizing a low-cost, high-performance single-crystal superalloy.

CN120924836APending Publication Date: 2025-11-11RED SILVER METAL CO LTD
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Patent Information

Application Number
CN202510924295.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-04
Publication Date
2025-11-11

AI Technical Summary

Technical Problem

Existing Re-free second-generation single-crystal superalloys have limitations in improving high-temperature strength and microstructure stability, especially due to the high γ/γ′ phase interface energy, making it difficult to further improve high-temperature mechanical properties through γ/γ′ phase interface strengthening.

Method used

By optimizing the chemical composition design of nickel-based single-crystal superalloys and controlling the proportions of Co, W, Ta, Mo, and Cr elements to achieve (Co+W+Ta)/(Mo+Cr) = 2.9–3.1, and combining this with appropriate heat treatment regimes, including solution treatment and aging treatment, a Re-free second-generation single-crystal superalloy with low γ/γ′ phase interface energy was prepared.

Benefits of technology

It achieves low interfacial energy and good microstructure stability in Re-free second-generation single-crystal superalloys, significantly improving high-temperature mechanical properties, with a creep life exceeding 150 hours, and at a lower cost than traditional Re-containing alloys.

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Abstract

The invention relates to a nickel-based single-crystal high-temperature alloy and a preparation method thereof, and relates to the technical field of nickel-based single-crystal high-temperature alloys, and the main technical scheme is as follows: the nickel-based single-crystal high-temperature alloy comprises the following chemical components in percentage by weight: 6-8 wt% of Cr, 7-9 wt% of Co, 2-3 wt% of Mo, 8-9 wt% of W, 5-7 wt% of Ta, 5-7 wt% of Al, 1-2 wt% of Ti, 0-0.05 wt% of C and the balance of Ni; wherein the sum of the percentage contents of the Co element, the W element and the Ta element is A; the sum of the percentage contents of the Mo element and the Cr element is B; wherein A / B is equal to 2.9 to 3.1. The invention mainly provides and prepares a nickel-based single-crystal high-temperature alloy, and the alloy has low gamma / gamma'phase interface energy and good long-term structure stability, and also has high-temperature mechanical properties obviously superior to those of typical second-generation Re-containing single-crystal high-temperature alloys.
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