Alloy 80A (UNS N07080) High-Temperature Nickel-Based Superalloy

# Alloy 80A (UNS N07080) High-Temperature Nickel-Based Superalloy

Introduction to Alloy 80A (UNS N07080)

Alloy 80A, also known by its UNS designation N07080, is a high-temperature nickel-based superalloy renowned for its exceptional strength and resistance to oxidation and corrosion at elevated temperatures. This alloy is widely used in demanding applications where reliability under extreme conditions is paramount.

Chemical Composition

The chemical composition of Alloy 80A plays a crucial role in its performance characteristics. The primary elements include:

  • Nickel (Ni): 70-80%

  • Chromium (Cr): 18-21%

  • Aluminum (Al): 1.0-2.0%

  • Titanium (Ti): 1.8-2.7%

  • Iron (Fe): ≤3.0%

  • Carbon (C): ≤0.10%

Key Properties of Alloy 80A

Alloy 80A exhibits several remarkable properties that make it suitable for high-temperature applications:

  • Excellent creep resistance at temperatures up to 815°C (1500°F)

  • Outstanding oxidation resistance in both continuous and cyclic service

  • Good mechanical strength at elevated temperatures

  • Superior resistance to carburization and nitriding environments

  • Good fabricability and weldability

Applications of Alloy 80A

Due to its exceptional properties, Alloy 80A finds applications in various industries:

  • Aerospace components (turbine blades, combustion chambers)

  • Power generation (gas turbine components)

  • Chemical processing equipment

  • Heat treatment fixtures

  • Nuclear reactor components

Heat Treatment and Processing

Alloy 80A typically undergoes solution annealing at 1080-1120°C (1975-2050°F) followed by rapid cooling. Aging treatments are often applied to optimize mechanical properties, typically at 700-800°C (1290-1470°F) for 16 hours.

Comparison with Other Nickel-Based Superalloys

Compared to other nickel-based superalloys, Alloy 80A offers:

  • Better oxidation resistance than Alloy 600 at high temperatures

  • Superior creep strength compared to Alloy 800H

  • More balanced properties than specialized alloys like Alloy 718

Conclusion

Alloy 80A (UNS N07080) remains a critical material for high-temperature applications where strength, oxidation resistance, and creep resistance are essential. Its balanced properties and reliability continue to make it a preferred choice in aerospace, power generation, and other demanding industries.