CM186LC Nickel Alloy

General Technical Characteristics

CM186LC is a heat-resistant cast nickel-based superalloy containing rhenium, designed for manufacturing gas turbine components that operate at high temperatures and under significant mechanical loads. The material is developed for use with directional solidification (DS) technology and is characterized by good castability, creep resistance, and resistance to grain-boundary cracking during the manufacture of complex thin-walled components.

The alloy contains chromium, cobalt, tungsten, rhenium, tantalum, aluminium, and hafnium. This combination provides high-temperature strength and promotes the formation of the strengthening γ′ phase. Rhenium and tungsten improve resistance to long-term deformation under load.

Typical chemical composition of CM186LC, wt.%:

• Nickel (Ni) — balance;
• Chromium (Cr) — approximately 6.0%;
• Cobalt (Co) — approximately 9.0%;
• Tungsten (W) — approximately 8.0%;
• Rhenium (Re) — approximately 3.0%;
• Aluminium (Al) — approximately 5.7%;
• Tantalum (Ta) — approximately 3.0%;
• 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 0.005%.

The mechanical properties of CM186LC depend on the casting process, solidification direction, heat treatment, and material microstructure. Its main characteristics include high-temperature strength, creep resistance, and the ability to maintain performance under prolonged loading. Exact strength and long-term performance values should be confirmed using the technical documentation for the specific material batch.

Applications

CM186LC nickel alloy is primarily used in aircraft engine manufacturing and the power generation industry. It is suitable for manufacturing turbine blades, thin-walled aerodynamic profiles, and other critical cast components for gas turbine installations.

The material is suitable for components with complex geometries that are exposed to high temperatures, centrifugal forces, and prolonged mechanical loads. Directional solidification helps improve component performance when manufacturing and heat treatment requirements are properly controlled.

Features of CM186LC Alloy

The main advantages of CM186LC include good castability, high creep resistance, and suitability for producing complex thin-walled turbine components. Its rhenium and tungsten content contributes to improved strength at elevated temperatures, while aluminium and tantalum help form the strengthening γ′ phase.

The alloy is intended for critical components with demanding heat-resistance and reliability requirements. Material selection should take into account operating temperature, load levels, crystal structure, and heat treatment parameters.

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