Inconel 939 Nickel Alloy
General Technical Characteristics
Inconel 939 (IN939) is a heat-resistant nickel-based superalloy designed for operation at high temperatures and under significant mechanical loads. The material is strengthened through heat treatment and offers high long-term strength, creep resistance, fatigue resistance, and oxidation resistance. Depending on operating conditions, the alloy can be used at temperatures of up to approximately 850°C.
Chemical composition, %:
- Nickel (Ni) — balance;
- Chromium (Cr) — 22.0–22.8%;
- Cobalt (Co) — 18.5–19.5%;
- Titanium (Ti) — 3.6–3.8%;
- Tungsten (W) — 1.9–2.2%;
- Aluminium (Al) — 1.8–2.1%;
- Tantalum (Ta) — 1.0–1.6%;
- Niobium (Nb) — 0.8–1.1%;
- Carbon (C) — 0.13–0.165%;
- Zirconium (Zr) — 0.08–0.12%;
- Boron (B) — 0.008–0.012%.
The mechanical properties of Inconel 939 depend on the manufacturing method, material microstructure, and heat treatment conditions. The alloy is characterized by high tensile strength, creep resistance, and durability at elevated temperatures. Exact values for strength, elongation, and long-term performance depend on the material condition and the applicable specification.
Applications
Inconel 939 nickel alloy is widely used in the aerospace industry, power generation, and gas turbine equipment manufacturing. It is suitable for producing turbine rotor and nozzle blades, hot-section turbine components, thermal protection components, and other parts exposed to high temperatures and prolonged mechanical loads.
The material is suitable for critical industrial gas turbine components where consistent performance, thermal fatigue resistance, and a long service life are essential.
Features of Inconel 939 Alloy
The main advantages of Inconel 939 include high-temperature strength, resistance to oxidation and hot corrosion, and resistance to deformation during prolonged exposure to elevated temperatures. Its strengthening mechanism relies, in part, on the formation of the γ′ phase during heat treatment.
The alloy is primarily used to manufacture cast components and may also be suitable for certain additive manufacturing processes. Material selection should take into account operating temperatures, load levels, manufacturing technology, and heat treatment requirements.
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