Nickelvac 901 Nickel Superalloy, UNS N09901; AMS 5660, 5661,E FORU

### **Product Introduction: Nickelvac® 901 (UNS N09901) Nickel-Iron-Based Superalloy** **Nickelvac 901** is a precipitation-hardenable nickel-iron superalloy specifically designed for high-strength applications at elevated temperatures. It offers an exceptional combination of high tensile, creep, and rupture strength, along with good structural stability in the 1000°F to 1200°F (540°C to 650°C) range. Its composition is carefully balanced to provide strength through gamma prime [γ'] precipitation while utilizing a substantial iron content for cost-effectiveness and specific physical properties. This alloy is particularly valued for its high strength-to-weight ratio and its ability to maintain properties under sustained stress at high temperatures, making it a critical material for rotating components in gas turbines and other high-performance engineering systems. --- #### **1. Chemical Composition (Weight %)** The typical chemical composition of Nickelvac 901 per AMS 5660 and 5661 is as follows: | Element | Content (%) | Element | Content (%) | | :--- | :--- | :--- | :--- | | **Nickel (Ni)** | 40.0 - 45.0 | **Molybdenum (Mo)** | 5.00 - 6.50 | | **Iron (Fe)** | Balance | **Silicon (Si)** | ≤ 0.40 | | **Chromium (Cr)** | 11.00 - 14.00 | **Manganese (Mn)** | ≤ 0.50 | | **Titanium (Ti)** | 2.80 - 3.30 | **Copper (Cu)** | ≤ 0.50 | | **Carbon (C)** | 0.02 - 0.06 | **Sulfur (S)** | ≤ 0.015 | | **Aluminum (Al)** | ≤ 0.30 | **Boron (B)** | 0.010 - 0.030 | *(Note: Balance is Iron, typically around 35-38%)* **Key Microstructure:** The high-temperature strength of Alloy 901 is primarily derived from the precipitation of the gamma prime (γ') phase, Ni₃(Ti, Al), within the austenitic matrix. The careful control of titanium, aluminum, and carbon is crucial for achieving the optimal distribution of this strengthening phase. --- #### **2. Physical Properties** Typical physical properties for Nickelvac 901 alloy are provided below. | Property | Metric Units | Imperial Units | | :--- | :--- | :--- | | **Density** | 8.22 g/cm³ | 0.297 lb/in³ | | **Melting Range** | ~1300 - 1390 °C | ~2370 - 2530 °F | | **Specific Heat (20°C)** | 456 J/kg·K | 0.109 Btu/lb·°F | | **Thermal Conductivity (20°C)** | 12.8 W/m·K | 89 Btu·in/hr·ft²·°F | | **Mean Coefficient of Thermal Expansion (20-100°C)** | 12.6 μm/m·°C | 7.0 μin/in·°F | | **Modulus of Elasticity (Tensile)** | 214 GPa | 31.0 x 10⁶ psi | --- #### **3. Mechanical Properties (Typical for AMS 5660/5661)** Mechanical properties are developed through a specific heat treatment cycle, typically involving solution treatment and a double aging process. **Standard Heat Treatment:** * **Solution Treat:** 1750°F - 1850°F (955°C - 1010°C), followed by rapid cooling (oil or water quench). * **Aging:** 1350°F ± 25°F (732°C ± 14°C) for 8 hours, air cool + 1150°F ± 25°F (621°C ± 14°C) for 8 hours, air cool. **Typical Room Temperature Mechanical Properties (After Full Heat Treatment):** | Property | Value (Typical) | | :--- | :--- | | **Tensile Strength** | 1200 MPa (175 ksi) min | | **Yield Strength (0.2% Offset)** | 860 MPa (125 ksi) min | | **Elongation (in 4D)** | 12% min | | **Reduction of Area** | 15% min | *Note: These are typical minimum values per AMS specifications; actual properties can be higher. Creep and stress rupture strength are key properties for this alloy at elevated temperatures.* --- #### **4. International Standards & Specifications** Nickelvac 901 is covered by several key aerospace and industry standards. **Primary Aerospace Material Specifications (AMS - SAE International):** * **AMS 5660:** Nickel Alloy, Corrosion and Heat-Resistant, Bars, Forgings, and Rings 42.5Ni - 13Cr - 2.5Ti - 6Mo - 36Fe (UNS N09901) Solution Heat Treated and Precipitation Hardenable. * **AMS 5661:** Nickel Alloy, Corrosion and Heat-Resistant, Wire 42.5Ni - 13Cr - 2.5Ti - 6Mo - 36Fe (UNS N09901) Solution Heat Treated. **Other Key Standards:** * **UNS:** N09901 * **ASTM:** B637 (Standard Specification for Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock for High-Temperature Service) * **AECMA/EN:** 2.4632 (European standard) * **ISO:** 9724 (Nickel alloy bars) * **Proprietary Specifications:** Often supplied to OEM-specific standards from major gas turbine manufacturers. --- #### **5. Product Applications** Nickelvac 901's primary application is in the hot sections of gas turbine engines where high strength at intermediate temperatures is critical. * **Aerospace & Gas Turbines:** * Turbine disks and rotors * Compressor disks (later stages) * Engine shafts * Spacers * Turbine blades (for lower-temperature stages) * Casings and high-strength fasteners * **Power Generation:** * Disks, blades, and rotors for land-based gas turbines * High-temperature bolting * **Industrial Equipment:** * Components for high-temperature process equipment * Fasteners for high-stress applications --- #### **Summary of Key Advantages** * **Excellent High-Temperature Strength:** Outstanding tensile, creep, and stress-rupture properties in the 1000°F - 1200°F (540°C - 650°C) range. * **High Strength-to-Weight Ratio:** Ideal for rotating components where centrifugal forces are critical. * **Good Structural Stability:** Maintains its microstructure and properties during long-term exposure at high temperatures. * **Cost-Effective Performance:** The high iron content provides a more cost-effective solution compared to some higher-nickel superalloys, while still delivering superior performance. **Disclaimer:** The information provided here is for reference purposes. Specific properties and performance are dependent on the manufacturing process, heat treatment, and final product form. For critical applications, always consult the official material specifications and the alloy producer's data sheets.

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 3130 gallon liquid totes Special package is available on request.