Keyword: Alloy 75 UNS N06075
# Alloy 75 (UNS N06075) High-Performance Nickel-Based Superalloy
Introduction to Alloy 75
Alloy 75, also known by its UNS designation N06075, is a high-performance nickel-based superalloy renowned for its exceptional strength, corrosion resistance, and thermal stability. This alloy is specifically engineered to withstand extreme environments, making it a preferred choice for demanding applications across various industries.
Key Properties of Alloy 75
Alloy 75 exhibits a unique combination of properties that set it apart from other nickel-based alloys:
- Excellent high-temperature strength
- Outstanding oxidation resistance
- Superior creep resistance
- Good thermal fatigue properties
- Resistance to carburization and sulfidation
Chemical Composition
The superior performance of Alloy 75 stems from its carefully balanced chemical composition:
| Element | Percentage |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 18-22% |
| Iron (Fe) | ≤5% |
| Molybdenum (Mo) | 2-4% |
| Cobalt (Co) | ≤2% |
| Tungsten (W) | 1-2% |
Applications of Alloy 75
Due to its remarkable properties, Alloy 75 finds applications in several critical industries:
Aerospace Industry
Used in turbine blades, combustion chambers, and afterburner components where high-temperature strength is paramount.
Power Generation
Employed in gas turbines, heat exchangers, and boiler components in power plants.
Chemical Processing
Ideal for reactors, piping systems, and valves handling corrosive chemicals at elevated temperatures.
Advantages Over Other Alloys
Alloy 75 offers several advantages compared to similar nickel-based superalloys:
- Better thermal stability at temperatures exceeding 1000°C (1832°F)
- Improved resistance to thermal cycling
- Enhanced creep rupture strength
- Superior microstructural stability during long-term exposure to high temperatures
Fabrication and Processing
Alloy 75 can be processed using standard techniques, though some considerations apply:
Machining
Requires rigid machine tools and positive feeds due to its work-hardening characteristics.
Welding
Can be welded using conventional methods, but post-weld heat treatment is often recommended.
Heat Treatment
Solution annealing at 1150-1200°C (2102-2192°F) followed by rapid cooling optimizes properties.