Alloy R41,Rene 41,UNS N07041,E FORU

### **Alloy R-41 / René 41 / UNS N07041

** **High-Strength Nickel-Based Superalloy for Advanced Aerospace Applications

** --- #### **1. Overview** **René 41** is a high-strength, precipitation-hardenable nickel-chromium superalloy designed for elevated temperature service up to 980°C (1800°F). This advanced superalloy achieves exceptional strength through a high volume fraction of gamma prime (γ') precipitates and solid-solution hardening. René 41 offers an outstanding combination of high-temperature strength, excellent oxidation resistance, and good creep rupture properties, making it particularly suitable for critical aerospace components in gas turbine engines and rocket systems. 

 --- #### **2. Chemical Composition (Weight %)

** The typical chemical composition of René 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. | 

| **Chromium (Cr)** | 18.0 - 20.0 | Provides oxidation and hot corrosion resistance. | 

| **Cobalt (Co)** | 10.0 - 12.0 | Enhances solid-solution strengthening and elevates γ' solvus temperature. | 

| **Molybdenum (Mo)** | 9.0 - 10.5 | Provides substantial solid-solution strengthening and enhances creep resistance. | 

| **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)). | 

| **Iron (Fe)** | 2.0 max | Controlled impurity; kept low to maintain high-temperature properties. | 

| **Boron (B)** | 0.003 - 0.008 | Enhances creep strength and grain boundary cohesion. | 

| **Carbon (C)** | 0.06 - 0.12 | Forms carbides for grain boundary strengthening. | 

| **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. | 

 --- #### **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) | 

| **Thermal Conductivity** | 11.5 W/m·K (80 Btu·in/hr·ft²·°F) at 21°C (70°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) | 

| **Magnetic Permeability** | Essentially non-magnetic. |

 --- #### **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

** René 41 is covered by 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 

 --- #### **6. Product Applications

** René 41 is used in the most demanding high-temperature aerospace applications: 

 *   **Aerospace Gas Turbines:

**    *   Turbine blades and vanes    

*   Afterburner components    

*   Combustion chambers    

*   Turbine discs and shafts 

*   **Rocket Systems:

**    *   Rocket motor cases    

*   Nozzle components    

*   Thrust chambers 

*   **Nuclear Applications:

**    *   Reactor core components    

*   High-temperature fasteners 

*   **Industrial Gas Turbines:

**    *   High-temperature structural components    

*   Turbine wheels 

 --- #### **7. Key Characteristics & Advantages

** *   **Exceptional High-Temperature Strength:

** Maintains mechanical properties up to 980°C (1800°F) 

*   **High γ' Volume Fraction:

** Optimized aluminum and titanium content provides strong precipitation hardening 

*   **Excellent Creep Resistance:

** Outstanding performance under sustained loading at elevated temperatures 

*   **Good Oxidation Resistance:** Suitable for service in high-temperature environments 

*   **Superior Rupture Strength:** Excellent stress rupture properties for critical applications 

*   **Good Thermal Stability:** Maintains microstructural integrity during high-temperature exposure 

*   **Proven Performance:** Extensive service history in advanced aerospace and rocket applications 

 --- **Disclaimer:

** *René 41 is a registered trademark of General Electric Company. 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. René 41 requires specialized heat treatment and welding procedures to achieve optimal properties and avoid strain-age cracking.*

Packing of Alloy R41,Rene 41,UNS N07041

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 1675 gallon liquid totes Special package is available on request.