RENE 77 Centri-Vac Nickel Cobalt Based Alloy，1

### **Product Introduction: RENE 77 Centri-Vac Nickel-Based Superalloy** **Overview** RENE 77 is a premium-grade, precipitation-hardenable nickel-cobalt superalloy specifically engineered for the most demanding high-temperature applications in aerospace and power generation. When manufactured using the advanced "Centri-Vac" process - combining centrifugal casting with vacuum melting - the alloy achieves exceptional metallurgical purity, directional solidification characteristics, and superior mechanical properties. This alloy represents a significant advancement in superalloy technology, offering an optimal balance of high-temperature strength, creep resistance, and environmental durability for critical rotating components in modern gas turbine engines. --- #### **Chemical Composition (Typical % by Weight)** | Element | Content (%) | Role & Benefit | |---------|-------------|---------------| | **Nickel (Ni)** | Balance | Austenitic matrix formation | | **Cobalt (Co)** | 14.0 - 16.0 | Solid solution strengthening and stability | | **Chromium (Cr)** | 14.0 - 15.0 | Oxidation and hot corrosion resistance | | **Molybdenum (Mo)** | 4.0 - 5.0 | Solid solution strengthening | | **Aluminum (Al)** | 3.8 - 4.3 | Primary γ' former (Ni₃Al) | | **Titanium (Ti)** | 3.2 - 3.7 | Secondary γ' former (Ni₃Ti) | | **Tungsten (W)** | 5.0 - 6.0 | Solid solution strengthening | | **Tantalum (Ta)** | 1.5 - 2.0 | Carbide formation and strengthening | | **Carbon (C)** | 0.05 - 0.10 | Carbide formation | | **Boron (B)** | 0.010 - 0.020 | Grain boundary strengthening | | **Zirconium (Zr)** | 0.03 - 0.07 | Creep improvement | *Note: "Centri-Vac" refers to proprietary centrifugal casting and vacuum melting processes.* --- #### **Physical & Mechanical Properties** **Physical Properties:** - Density: 8.12 g/cm³ (0.293 lb/in³) - Melting Range: 1280-1350°C (2336-2462°F) - Thermal Expansion: 13.2 μm/m·°C @ 20-100°C - Thermal Conductivity: 17.5 W/m·K @ 500°C - Specific Heat: 420 J/kg·K @ 20°C **Mechanical Properties (Heat Treated):** - Tensile Strength: 1100 MPa (160 ksi) min - Yield Strength (0.2% Offset): 850 MPa (123 ksi) min - Elongation: 8% min - Reduction of Area: 12% min - Creep Rupture Strength: Excellent at 980°C (1800°F) --- #### **International Standards and Specifications** RENE 77 is governed by stringent aerospace and material specifications: - **AMS 5396:** Investment castings, vacuum melted - **GE S-800:** General Electric material specification - **Pratt & Whitney CS-6000:** Proprietary specification - **Rolls-Royce RRS 700:** Proprietary material standard - **OEM-specific standards:** Major gas turbine manufacturers maintain detailed proprietary specifications --- #### **Product Applications** **Aerospace Applications:** - High-pressure turbine blades and vanes - Turbine disks and rotors - Compressor disks and shafts - Afterburner components - Exhaust system components **Industrial Applications:** - Industrial gas turbine blades - Power generation turbine components - Nuclear reactor components - High-temperature fasteners and hardware - Specialized tooling for high-temperature processing --- #### **Key Advantages** 1. **Exceptional High-Temperature Strength**: Maintains mechanical properties up to 1040°C (1900°F) 2. **Superior Creep Rupture Life**: Excellent long-term performance under high stress 3. **Enhanced Thermal Fatigue Resistance**: Withstands severe thermal cycling conditions 4. **Outstanding Oxidation Resistance**: Superior performance in aggressive environments 5. **Optimized Microstructural Stability**: Maintains properties during extended high-temperature exposure 6. **Excellent Phase Stability**: Resists formation of detrimental topologically close-packed (TCP) phases 7. **Good Castability**: Suitable for complex component geometries with directional solidification --- **Conclusion** RENE 77 Centri-Vac alloy represents the forefront of nickel-cobalt superalloy technology for extreme temperature applications in advanced gas turbine engines. Its sophisticated chemistry, featuring optimized levels of refractory elements and enhanced gamma prime formers, delivers unparalleled performance for the most demanding rotating components. The Centri-Vac manufacturing process ensures superior metallurgical quality, directional solidification capability, and exceptional reliability, making this alloy a preferred choice for critical aerospace and power generation applications where performance and safety are paramount. Governed by stringent OEM specifications and quality standards, RENE 77 continues to enable advancements in turbine efficiency, operational reliability, and service life extension.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3415 gallon liquid totes Special package is available on request.