Alloy 115,Nimonic 115,,E FORU

### **Alloy 115 / Nimonic® 115** **Advanced Nickel-Based Superalloy for High-Temperature Turbine Components** #### **1. Overview** **Alloy 115**, commercially known as **Nimonic® 115**, represents a significant advancement in nickel-based superalloy technology, offering exceptional high-temperature strength and creep resistance. Developed specifically for the most demanding gas turbine applications, this precipitation-hardenable alloy maintains excellent mechanical properties at temperatures up to 950°C (1742°F). Nimonic 115 is characterized by its high γ' (gamma prime) volume fraction and optimized chemical composition, making it ideal for critical rotating components in modern aerospace and industrial gas turbines. #### **2. Chemical Composition (Weight %)** The typical chemical composition of Nimonic 115 is outlined below. The balance is Nickel (Ni). | Element | Content (%) | Key Function | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | Forms the austenitic matrix and provides fundamental high-temperature capability. | | **Chromium (Cr)** | 14.0 - 15.5 | Provides oxidation and hot corrosion resistance. | | **Cobalt (Co)** | 13.5 - 15.5 | Enhances solid-solution strengthening and raises γ' solvus temperature. | | **Molybdenum (Mo)** | 3.25 - 4.25 | Provides solid-solution strengthening and enhances creep resistance. | | **Aluminum (Al)** | 4.75 - 5.25 | Primary precipitation hardening element forming γ' phase (Ni₃Al). | | **Titanium (Ti)** | 3.75 - 4.25 | Co-precipitates with aluminum to form γ' phase (Ni₃(Al,Ti)). | | **Iron (Fe)** | 1.0 max | Controlled impurity; kept low to maintain high-temperature properties. | | **Manganese (Mn)** | 0.50 max | Improves hot workability. | | **Silicon (Si)** | 0.50 max | Enhances oxidation resistance. | | **Carbon (C)** | 0.12 - 0.18 | Forms carbides for grain boundary strengthening. | | **Boron (B)** | 0.010 - 0.020 | Enhances creep strength and grain boundary cohesion. | | **Zirconium (Zr)** | 0.05 - 0.10 | Improves creep-rupture properties and thermal stability. | | **Copper (Cu)** | 0.20 max | Controlled impurity. | | **Sulfur (S)** | 0.010 max | Impurity, kept very low to prevent hot shortness. | #### **3. Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 7.95 g/cm³ (0.287 lb/in³) | | **Melting Range** | ~ 1330 - 1380 °C (2426 - 2516 °F) | | **Mean Coefficient of Thermal Expansion** | 20 - 500°C (68 - 932°F): **13.8 x 10⁻⁶/°C** (7.7 x 10⁻⁶/°F)
20 - 800°C (68 - 1472°F): **14.9 x 10⁻⁶/°C** (8.3 x 10⁻⁶/°F) | | **Thermal Conductivity** | 15.8 W/m·K (109 Btu·in/hr·ft²·°F) at 20°C (68°F)
23.5 W/m·K (163 Btu·in/hr·ft²·°F) at 800°C (1472°F) | | **Specific Heat** | 460 J/kg·K (0.110 Btu/lb·°F) at 20°C (68°F) | | **Electrical Resistivity** | 1.32 μΩ·m at 20°C (68°F) | | **Modulus of Elasticity (Young's Modulus)** | 228 GPa (33.1 x 10⁶ psi) at 20°C (68°F) | | **Magnetic Permeability** | Essentially non-magnetic. | #### **4. Mechanical Properties (Typical for Aged Condition)** | Property | At Room Temperature | At 750°C (1382°F) | At 850°C (1562°F) | | :--- | :--- | :--- | :--- | | **Tensile Strength** | 1250 - 1450 MPa (181 - 210 ksi) | ~750 MPa (109 ksi) | ~520 MPa (75 ksi) | | **Yield Strength (0.2% Offset)** | 900 - 1050 MPa (131 - 152 ksi) | ~650 MPa (94 ksi) | ~450 MPa (65 ksi) | | **Elongation (in 50 mm / 2 in)** | 8% - 15% | 6% - 12% | 8% - 15% | | **Reduction of Area** | 12% - 20% | 10% - 18% | 12% - 22% | | **Hardness (Rockwell C)** | 35 - 42 HRC | - | - | #### **5. International Standards** Nimonic 115 is covered by several international and industry-specific standards: * **ASTM:** * **B 637:** Standard Specification for Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock for High-Temperature Service * **AMS:** * **AMS 5763:** Bar, Forgings, and Rings * **AMS 5800:** Welding Electrode * **BS / EN:** * **BS HR 509:** Aerospace series * **EN 10095:** Heat resisting steels and nickel alloys * **DIN:** 2.4970 (Material Number) * **ISO:** ISO 9723, ISO 9724 * **AECMA:** PR EN 2956 #### **6. Product Applications** Nimonic 115 is used in the most critical high-temperature applications requiring maximum performance: * **Aerospace Gas Turbines:** * High-pressure turbine blades * Turbine vanes and nozzles * Discs and rotors * Shaft components * **Industrial Gas Turbines:** * First-stage turbine blades * Rotor assemblies * High-temperature structural components * **Power Generation:** * Advanced gas turbine components * High-temperature fastening systems * **Racing and High-Performance Applications:** * Turbocharger turbines * High-temperature exhaust components #### **7. Key Characteristics & Advantages** * **Exceptional High-Temperature Strength:** Maintains superior mechanical properties at temperatures up to 950°C (1742°F) * **Outstanding Creep Resistance:** Excellent long-term creep performance under high stress conditions * **High γ' Volume Fraction:** Optimized aluminum and titanium content provides strong precipitation hardening * **Excellent Microstructural Stability:** Maintains properties during extended high-temperature exposure * **Superior Rupture Strength:** Excellent stress rupture properties for critical rotating components * **Good Oxidation Resistance:** Suitable for long-term service in aggressive high-temperature environments * **Proven Performance:** Extensive service history in advanced gas turbine applications --- **Disclaimer:** *Nimonic® is a registered trademark of Rolls-Royce plc. The values provided are typical and for informational purposes only. For critical applications, always consult the official material data sheets from the supplier and relevant design codes.*

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 1662 gallon liquid totes Special package is available on request.