低成本高强度第二代镍基单晶高温合金DD515及其制备工艺
By reducing the Re element content and optimizing the contents of W, Mo, Al, and Ta, combined with a multi-stage heat treatment process, a low-cost, high-strength nickel-based single-crystal superalloy DD515 was prepared. This solved the problem of high cost and performance in nickel-based single-crystal superalloys, achieving excellent strength and oxidation resistance at high temperatures.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- INST OF METAL RESEARCH - CHINESE ACAD OF SCI
- Filing Date
- 2022-11-01
- Publication Date
- 2026-07-17
AI Technical Summary
Existing nickel-based single-crystal superalloys are expensive and cannot achieve both performance and cost-effectiveness. In particular, the addition of Re element increases the cost of the alloy and causes TCP phase precipitation, which affects the mechanical properties and thermal stability of the alloy.
By reducing the Re element content to 1.5% and optimizing the contents of W, Mo, Al, and Ta, combined with a multi-stage heat treatment process, a low-cost, high-strength nickel-based single-crystal superalloy DD515 was prepared. Directional solidification and three-stage aging treatment were used to improve the precipitation strengthening and solid solution strengthening effects of the alloy and reduce the tendency of TCP phase precipitation.
The alloy achieves low cost (Re content reduced by 50%, cost reduced by more than 30%) and excellent performance, with high temperature strength, oxidation resistance and creep resistance. The creep life at 1093℃ exceeds 30h, the tensile strength at 870℃ exceeds 780MPa, and the microstructure is stable.
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