Inconel 738LC Nickel Alloy
General Technical Characteristics
Inconel 738LC is a heat-resistant cast nickel-based superalloy designed for manufacturing components that operate at high temperatures and under significant mechanical loads. The material belongs to the precipitation-hardened alloy group and is characterized by high strength, creep resistance, and resistance to oxidation and high-temperature corrosion. Inconel 738LC is widely used in the production of gas turbine components that require long-term performance under demanding thermal conditions.
Chemical composition of Inconel 738LC, %:
- Nickel (Ni) — balance;
- Chromium (Cr) — 15.7–16.3%;
- Cobalt (Co) — 8.0–9.0%;
- Molybdenum (Mo) — 1.5–2.0%;
- Tungsten (W) — 2.4–2.8%;
- Aluminum (Al) — 3.2–3.7%;
- Titanium (Ti) — 3.2–3.7%;
- Tantalum (Ta) — 1.5–2.0%;
- Niobium (Nb) — 0.6–1.1%;
- Carbon (C) — 0.09–0.13%;
- Boron (B) — 0.007–0.012%;
- Zirconium (Zr) — 0.03–0.08%.
The mechanical properties of the alloy depend on the casting process and heat treatment. For certain material conditions at room temperature, reference values for ultimate tensile strength are approximately 895–1060 MPa, while yield strength is around 792–930 MPa. Elongation may reach 10%. Actual properties depend on the applicable specification and the certificate for the specific batch.
Applications
The Inconel 738LC nickel alloy is used in the aerospace industry, power generation, and industrial gas turbine equipment manufacturing. Its primary applications include the production of turbine rotor blades, nozzle guide vanes, hot-section gas turbine engine components, and other cast parts exposed to high temperatures.
The material is widely used in aircraft and industrial turbine manufacturing, where high long-term strength, creep resistance, and high-temperature oxidation resistance are essential. The alloy is also used for critical components in power generation systems operating under intense thermal and mechanical loads.
Features
A key feature of Inconel 738LC is its lower carbon content compared with the Inconel 738C modification. The alloy offers structural stability, excellent high-temperature strength, and resistance to hot corrosion. Its composition helps maintain the required operating properties during prolonged exposure to elevated temperatures.
Inconel 738LC is primarily used for manufacturing complex-shaped castings, including components produced by vacuum casting. When selecting the material, it is important to consider operating conditions, heat treatment requirements, and the applicable product specification.
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