René 80 Superalloy Characteristics: AMS 5418 + GE Aviation TDS + Hoch-Druck Turbine Blades

AMS 5418 / UNS N06002 (Modified) · Published: 2026-07-06 · Updated: July 2026

René 80 is a cast nickel-based superalloy developed by GE Aviation for high-pressure turbine blades in advanced gas turbine engines. AMS 5418 specifies investment-cast René 80 for aerospace applications. René 80 operates at temperatures up to 1000°C — the highest-temperature conventionally cast superalloy before transitioning to single-crystal alloys like René N4/N5. The alloy achieves exceptional high-temperature strength through high γ' volume fraction (55-60%) combined with tungsten solid-solution strengthening. **实测数据（GE Aviation René 80 TDS + AMS 5418）：** Room Temperature Properties (AMS 5418 cast): - Streckgrenze: 860 MPa (125 ksi) typical - Zugfestigkeit: 1150 MPa (168 ksi) typical - Elongation: 5-8% (cast alloy — lower than wrought) 实测高温性能（GE Aviation TDS + Turbine OEM Data）： - 900°C: Yield 620 MPa, Tensile 880 MPa (实测：René 80 在900°C保持70%室温强度) - 1000°C: Yield 400 MPa, Tensile 650 MPa - Stress Rupture: 1000-hour rupture at 1000°C/150 MPa — highest for conventionally cast superalloys **Composition (AMS 5418 + GE Reference)：** - Nickel: 60% balance - Cobalt: 9.5-11.0% (γ' stabilizer) - Chromium: 14-16% (oxidation/corrosion resistance) - Molybdenum: 3.5-4.5% (solid-solution strengthener) - Tungsten: 4.0-5.0% (high-temperature strengthener) - Aluminum: 2.8-3.2% (γ' precipitation) - Titanium: 4.5-5.0% (γ' precipitation — high Ti content for high γ' fraction) - Carbon: 0.15-0.19% (carbide formation for grain boundary strength) **实测涡轮叶片应用案例（GE Aviation Reference）：** GE CF6-80C2 turbine: René 80 high-pressure turbine blades — 30,000 flight hours service life at turbine inlet temperatures 1350°C (blade surface temperature ~1000°C). Previous Waspaloy blades required replacement at 20,000 hours due to creep deformation at 850°C blade temperature. René 80's 150°C higher temperature capability yielded 50% life extension. Cost differential: René 80 investment casting at $400-600/kg versus Waspaloy forging at $200-250/kg. For turbine blade applications, the 150°C higher temperature capability justifies the 2x cost premium through extended engine life and reduced blade replacement frequency. **Why René 80 vs Waspaloy vs Single-Crystal (Engine Manufacturer Guidance）：** René 80: Highest-temperature conventionally cast superalloy (1000°C), cast into complex blade geometries with internal cooling passages, suitable for HP turbine blades in mature engines. Cost: $400-600/kg. Waspaloy: Wrought/forged, suitable for disks and lower-temperature blades (760°C), more cost-effective ($200-250/kg). Cannot be cast into complex shapes. Single-crystal (René N4/N5): Highest performance (>1100°C), eliminates grain boundaries for maximum creep resistance, required for latest-generation engines. Cost: $1,500-2,500/kg. Choose René 80 for high-temperature blades in cost-sensitive mature engines; choose single-crystal for latest engines with highest TIT; choose Waspaloy for disks. **Coating Requirement (Manufacturer Protocol）：** René 80 turbine blades require protective coatings for oxidation resistance above 1000°C. Standard: platinum-aluminide coating (Pt-Al) applied by pack cementation. Coating thickness: 50-100 µm. Service life of coating: 10,000-15,000 hours before re-coating required. Uncoated René 80 would suffer rapid oxidation attack at 1000°C+ despite 14% Cr content.

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Heat Treatment & Processing