CM 247 LC Nickel Alloy
General Technical Characteristics
CM 247 LC is a heat-resistant cast nickel-based superalloy developed from MAR-M 247 for manufacturing gas turbine components using directional solidification. The material offers high strength at elevated temperatures, creep resistance, and excellent long-term performance. Its lower carbon content compared with the original alloy helps improve casting characteristics and reduce susceptibility to cracking during solidification.
Chemical composition of CM 247 LC, % (typical values):
- Nickel (Ni) — balance;
- Chromium (Cr) — approximately 8.0–8.5%;
- Cobalt (Co) — approximately 9.2–9.5%;
- Tungsten (W) — approximately 9.4–9.5%;
- Aluminum (Al) — approximately 5.6%;
- Tantalum (Ta) — approximately 3.2%;
- Hafnium (Hf) — approximately 1.4%;
- Titanium (Ti) — approximately 0.7%;
- Molybdenum (Mo) — approximately 0.5%;
- Carbon (C) — approximately 0.07%;
- Boron (B) — approximately 0.015%;
- Zirconium (Zr) — approximately 0.015%.
The mechanical properties of CM 247 LC depend on the casting method, crystallographic orientation, and heat treatment. The alloy is characterized by high long-term strength, creep resistance, and resistance to fatigue failure at elevated temperatures. Specific values for tensile strength, yield strength, and elongation should be determined from the technical documentation for the relevant material condition.
Applications
CM 247 LC nickel alloy is widely used in aerospace engine manufacturing and the power generation industry. Its main applications include the production of gas turbine rotor blades, nozzle guide vanes, hot-section turbine engine components, and other critical parts exposed to high temperatures and significant mechanical loads.
The material is suitable for manufacturing components with complex geometries and thin walls, including parts with internal cooling passages. CM 247 LC is used in aircraft and industrial gas turbine systems where structural stability and long component service life are essential.
Features
The main advantages of CM 247 LC include high-temperature strength, creep resistance, and suitability for producing complex castings through directional solidification. The alloy is strengthened by the γ′ phase, which helps maintain its mechanical properties at elevated temperatures. Its lower carbon content compared with MAR-M 247 also contributes to improved casting characteristics.
When selecting this material, it is important to consider heat treatment requirements, casting structure, and operating conditions. CM 247 LC is primarily intended for specialized casting applications and requires carefully controlled manufacturing processes.
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