Alloy R41,Udimet alloy R41,UNS N07041,E FORU

### **Alloy R-41 / Udimet® Alloy R-41 / UNS N07041** **High-Performance Nickel-Based Superalloy for Extreme Temperature Applications** --- #### **1. Overview** **Udimet Alloy R-41** is a high-strength, precipitation-hardenable nickel-chromium superalloy designed for service in extreme temperature environments up to 980°C (1800°F). This advanced superalloy achieves exceptional mechanical properties through a high volume fraction of gamma prime (γ') precipitates combined with solid-solution strengthening. Udimet R-41 offers an outstanding balance of high-temperature strength, excellent creep resistance, and good oxidation resistance, making it particularly suitable for critical components in aerospace propulsion systems and power generation turbines. --- #### **2. Chemical Composition (Weight %)** The typical chemical composition of Udimet R-41 is outlined below. The balance is Nickel (Ni). | Element | Content (%) | Key Function | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | Forms the austenitic matrix and provides fundamental high-temperature stability and corrosion resistance. | | **Chromium (Cr)** | 18.0 - 20.0 | Provides excellent oxidation and hot corrosion resistance through protective Cr₂O₃ scale formation. | | **Cobalt (Co)** | 10.0 - 12.0 | Enhances solid-solution strengthening and raises the γ' solvus temperature. | | **Molybdenum (Mo)** | 9.0 - 10.5 | Provides substantial solid-solution strengthening and enhances creep resistance at elevated temperatures. | | **Aluminum (Al)** | 1.4 - 1.8 | Primary precipitation hardening element forming γ' phase (Ni₃Al). | | **Titanium (Ti)** | 3.0 - 3.3 | Co-precipitates with aluminum to form γ' phase (Ni₃(Al,Ti)), significantly increasing strength. | | **Iron (Fe)** | 2.0 max | Controlled impurity; kept low to maintain optimal high-temperature properties. | | **Boron (B)** | 0.003 - 0.008 | Enhances creep strength and improves grain boundary cohesion. | | **Carbon (C)** | 0.06 - 0.12 | Forms carbides for grain boundary strengthening and improved thermal stability. | | **Silicon (Si)** | 0.50 max | Controlled impurity. | | **Manganese (Mn)** | 0.50 max | Controlled impurity. | | **Copper (Cu)** | 0.20 max | Controlled impurity. | | **Sulfur (S)** | 0.015 max | Impurity, kept very low to prevent hot shortness and embrittlement. | --- #### **3. Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.27 g/cm³ (0.299 lb/in³) | | **Melting Range** | ~ 1316 - 1366 °C (2400 - 2490 °F) | | **Mean Coefficient of Thermal Expansion** | 20 - 540°C (68 - 1000°F): **13.9 x 10⁻⁶/°C** (7.7 x 10⁻⁶/°F)
20 - 870°C (68 - 1600°F): **15.2 x 10⁻⁶/°C** (8.4 x 10⁻⁶/°F) | | **Thermal Conductivity** | 11.5 W/m·K (80 Btu·in/hr·ft²·°F) at 21°C (70°F)
19.8 W/m·K (137 Btu·in/hr·ft²·°F) at 540°C (1000°F) | | **Specific Heat** | 455 J/kg·K (0.109 Btu/lb·°F) at 21°C (70°F) | | **Electrical Resistivity** | 1.30 μΩ·m at 21°C (70°F) | | **Modulus of Elasticity (Young's Modulus)** | 221 GPa (32.1 x 10⁶ psi) at 21°C (70°F)
172 GPa (25.0 x 10⁶ psi) at 760°C (1400°F) | | **Magnetic Permeability** | Essentially non-magnetic in all conditions. | --- #### **4. Mechanical Properties (Typical for Aged Condition)** | Property | At Room Temperature | At 760°C (1400°F) | At 870°C (1600°F) | | :--- | :--- | :--- | :--- | | **Tensile Strength** | 1450 MPa (210 ksi) | 760 MPa (110 ksi) | 480 MPa (70 ksi) | | **Yield Strength (0.2% Offset)** | 1240 MPa (180 ksi) | 690 MPa (100 ksi) | 415 MPa (60 ksi) | | **Elongation (in 50 mm / 2 in)** | 8% | 10% | 12% | | **Reduction of Area** | 12% | 15% | 18% | | **Hardness (Rockwell C)** | 38 - 42 HRC | - | - | --- #### **5. International Standards** Udimet R-41 conforms to the following international specifications: * **ASTM:** * **B637:** Standard Specification for Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock for High-Temperature Service * **AMS:** * **AMS 5545:** Sheet, Strip, and Plate * **AMS 5712:** Bar and Forging Stock * **AMS 5832:** Welding Wire * **UNS:** N07041 * **Aerospace Standards:** * **NAS:** National Aerospace Standards * **MS:** Military Standards for high-temperature components --- #### **6. Product Applications** Udimet R-41 serves critical functions in the most demanding high-temperature applications: * **Aerospace Gas Turbines:** * Turbine blades and vanes * Afterburner components and combustion chambers * Turbine discs, shafts, and spacers * Compressor components in high-temperature stages * **Rocket and Missile Systems:** * Rocket motor cases and nozzle components * Thrust chambers and injector plates * High-temperature structural supports * **Power Generation:** * Gas turbine components for power plants * High-temperature fasteners and hardware * Turbine wheels and discs in industrial turbines * **Nuclear Applications:** * Reactor core components * High-temperature instrumentation and supports --- #### **7. Key Characteristics & Advantages** * **Exceptional High-Temperature Strength:** Maintains outstanding mechanical properties up to 980°C (1800°F) * **High γ' Volume Fraction:** Optimized aluminum and titanium content provides strong precipitation hardening up to approximately 40% volume fraction * **Excellent Creep Resistance:** Superior performance under sustained loading at elevated temperatures with minimal deformation * **Good Oxidation Resistance:** Suitable for long-term service in high-temperature oxidizing environments up to 980°C (1800°F) * **Superior Rupture Strength:** Excellent stress rupture properties for critical high-stress applications * **Good Thermal Stability:** Maintains microstructural integrity during extended high-temperature exposure * **Proven Reliability:** Extensive service history in advanced aerospace, rocket, and power generation applications --- **Disclaimer:** *Udimet® is a registered trademark of Special Metals Corporation. 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. Udimet R-41 requires specialized heat treatment procedures and careful control of welding parameters to achieve optimal properties and avoid strain-age cracking during fabrication.*

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 1676 gallon liquid totes Special package is available on request.