Astroloy Nickel Superalloy,UNS N13017; AMS 5851, 5852, 5882,E FORU

### **Product Introduction: Astroloy (UNS N13017) Nickel-Based Superalloy** **Astroloy** is a high-strength, precipitation-hardenable nickel-based superalloy specifically engineered for exceptional performance at temperatures up to 1400°F (760°C) and beyond. It is characterized by its very high volume fraction of the gamma prime (γ') strengthening phase, which constitutes over 50% of its microstructure. This results in superior tensile strength, creep resistance, and stress rupture properties compared to many other superalloys. Due to its high alloying content and susceptibility to segregation during conventional casting, Astroloy is almost exclusively produced using **Powder Metallurgy (PM)** and **Hot Isostatic Pressing (HIP)** or **Extrusion** processes. This manufacturing route ensures a uniform, fine-grained microstructure necessary for achieving its maximum mechanical properties and reliability in critical aerospace components. --- #### **1. Chemical Composition (Weight %)** The typical chemical composition of Astroloy per AMS specifications is as follows: | Element | Content (%) | Element | Content (%) | | :--- | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | **Cobalt (Co)** | 15.00 - 20.00 | | **Chromium (Cr)** | 14.00 - 16.00 | **Molybdenum (Mo)** | 4.50 - 5.50 | | **Aluminum (Al)** | 3.90 - 4.50 | **Boron (B)** | 0.020 - 0.040 | | **Titanium (Ti)** | 3.30 - 3.70 | **Zirconium (Zr)** | 0.020 - 0.080 | | **Carbon (C)** | 0.02 - 0.06 | **Iron (Fe)** | ≤ 0.50 | | **Manganese (Mn)**| ≤ 0.10 | **Silicon (Si)** | ≤ 0.15 | **Key Microstructure:** The exceptional high-temperature strength of Astroloy is derived from a very high volume fraction (typically >50%) of the ordered gamma prime (γ') phase, Ni₃(Al, Ti). The combination of high Aluminum and Titanium content is critical for forming this phase. The alloy is further strengthened by solid solution elements like Molybdenum and Cobalt. --- #### **2. Physical Properties** Typical physical properties for Astroloy are provided below. | Property | Metric Units | Imperial Units | | :--- | :--- | :--- | | **Density** | 8.00 g/cm³ | 0.289 lb/in³ | | **Melting Range** | ~1330 - 1380 °C | ~2425 - 2515 °F | | **Thermal Conductivity (20°C)** | 10.5 W/m·K | 72.8 Btu·in/hr·ft²·°F | | **Mean Coefficient of Thermal Expansion (20-1000°C)** | 14.5 μm/m·°C | 8.1 μin/in·°F | | **Modulus of Elasticity (Tensile)** | 214 GPa | 31.0 x 10⁶ psi | --- #### **3. Mechanical Properties (Typical for AMS Specifications)** Mechanical properties are developed through a complex heat treatment cycle typically involving a high-temperature solution treatment followed by a multi-step aging process. Properties can vary significantly based on the specific PM processing route (e.g., HIP, HIP + Forge) and heat treatment. **Common Heat Treatment:** * **Solution Treat:** ~2150°F (1177°C), rapid cool. * **Aging:** Multi-step process involving intermediate and lower temperature aging (e.g., 1975°F / 1079°C and 1400°F / 760°C). **Typical Elevated Temperature Mechanical Properties (at 1400°F / 760°C):** | Property | Value (Typical) | | :--- | :--- | | **Tensile Strength** | 1035 MPa (150 ksi) | | **Yield Strength (0.2% Offset)** | 895 MPa (130 ksi) | | **Elongation** | 10 - 20% | | **Stress Rupture (1400°F / 760°C @ 690 MPa / 100 ksi)** | 40+ hours | *Note: These are representative values. Specific minimums are defined in the AMS specifications for the respective product forms.* --- #### **4. International Standards & Specifications** Astroloy is primarily covered by Aerospace Material Specifications (AMS) from SAE International, which define the requirements for its various product forms produced via powder metallurgy. **Primary Aerospace Material Specifications (AMS - SAE International):** * **AMS 5851:** Powder Metallurgy (PM) Nickel Alloy, Corrosion and Heat Resistant, Bars, Forgings, and Rings (Solution Heat Treated and Aged). * **AMS 5852:** Powder Metallurgy (PM) Nickel Alloy, Corrosion and Heat Resistant, Bars, Forgings, and Rings (Solution Heat Treated). * **AMS 5882:** Powder Metallurgy (PM) Nickel Alloy, Corrosion and Heat Resistant, Investment Castings (Solution and Precipitation Heat Treated). **Other Key Standards:** * **UNS:** N13017 * **Proprietary Specifications:** Widely used under OEM-specific standards from gas turbine manufacturers (e.g., GE, Rolls-Royce, Pratt & Whitney) that often have more detailed processing and property requirements. --- #### **5. Product Applications** Astroloy's primary application is in the most demanding, high-stress sections of modern gas turbine engines. * **Aerospace & Gas Turbines:** * **High-Pressure Turbine Discs (Rotors)** * **Turbine Blisks (Bladed Disks)** * Turbine seals and spacers * Compressor discs (for later, high-temperature stages) * Shafts and other critical rotating components * **Industrial Gas Turbines (IGT):** * Rotors and discs for land-based power generation turbines. --- #### **Summary of Key Advantages** * **Exceptional High-Temperature Strength:** Offers superior tensile, creep, and stress-rupture properties in the 1200°F - 1500°F (650°C - 815°C) range, outperforming alloys like Waspaloy and 718. * **Excellent Microstructural Stability:** The PM+HIP manufacturing process provides a homogeneous, segregation-free structure that is stable under long-term exposure to high temperatures and stress. * **High Gamma Prime Content:** A very high volume fraction of the γ' phase provides the fundamental strengthening mechanism for sustained performance at extreme temperatures. * **Critical Component Enabler:** Allows for the design of higher-efficiency jet engines with increased operating temperatures and rotational speeds. **Disclaimer:** The information provided here is for reference purposes. Astroloy is a highly specialized alloy where specific properties and performance are critically dependent on the precise powder metallurgy processing route and heat treatment. For all applications, compliance with the official AMS, OEM specifications, and the processor's data sheets is mandatory.

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 3134 gallon liquid totes Special package is available on request.