DENSITY
9 kg/m³
MELTING POINT
1,315°C
TENSILE STRENGTH
965 MPa
MAX SERVICE TEMP
1,050°C
MAR-M-247 is a superalloy used in aerospace applications. Melting point: 1,315 °C. Tensile strength: 965 MPa.
ABOUT MAR-M-247
MAR-M-247 is a cast nickel-base superalloy designed for high-temperature turbine blade applications. It offers exceptional creep resistance and oxidation resistance at temperatures above 1000°C. The alloy contains hafnium additions for improved grain boundary strength in directionally solidified and single-crystal castings.
CHEMICAL COMPOSITION
Ni 59%, Cr 8.25%, Co 10%, W 10%, Al 5.5%, Ti 1%, Ta 3%, Hf 1.5%, Mo 0.7%
ROCKET & SPACECRAFT APPLICATIONS
●Turbine blades
●Rocket engine nozzle guide vanes
●Turbopump impellers
●High-pressure turbine components
●Integral cast rotors
MANUFACTURING PROPERTIES
CORROSION RESISTANCE
Good
WELDABILITY
Poor
MACHINABILITY
Poor
COST RATING
Very High
MECHANICAL PROPERTIES
| DENSITY | 9 kg/m³ |
| TENSILE STRENGTH | 965 MPa |
| YIELD STRENGTH | 815 MPa |
| STRENGTH-TO-WEIGHT | 113130.1 kN·m/kg |
THERMAL PROPERTIES
| MELTING POINT | 1,315 °C |
| MAX SERVICE TEMPERATURE | 1,050 °C |
| THERMAL CONDUCTIVITY | 10.5 W/m·K |
| THERMAL EXPANSION | 12.0 µm/m·K |
COMPLETE SPECIFICATIONS
| CATEGORY | Superalloy |
| DESIGNATIONS | AMS 5757 |
| MANUFACTURER | Martin Marietta (now Lockheed Martin) |
| DENSITY | 9 kg/m³ |
| TENSILE STRENGTH | 965 MPa |
| YIELD STRENGTH | 815 MPa |
| MELTING POINT | 1,315 °C |
| MAX SERVICE TEMP | 1,050 °C |
| THERMAL CONDUCTIVITY | 10.5 W/m·K |
| THERMAL EXPANSION | 12.0 µm/m·K |
| CORROSION RESISTANCE | Good |
| WELDABILITY | Poor |
| MACHINABILITY | Poor |
| COST RATING | Very High |
