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Alloy A286 (UNS S66286) High-Temperature Superalloy
Alloy A286, also known by its UNS designation S66286, is a high-performance iron-nickel-chromium superalloy renowned for its exceptional strength and corrosion resistance at elevated temperatures. This precipitation-hardening alloy is widely used in aerospace, gas turbine, and industrial applications where reliability under extreme conditions is critical.
Key Characteristics of Alloy A286
This superalloy offers several outstanding properties that make it ideal for demanding environments:
- Excellent high-temperature strength up to 1300°F (700°C)
- Superior creep and stress rupture resistance
- Good oxidation resistance in continuous service
- Outstanding corrosion resistance in various environments
- Maintains mechanical properties after prolonged exposure to heat
Chemical Composition
The typical composition of Alloy A286 includes:
| Element | Percentage |
|---|---|
| Nickel (Ni) | 24-27% |
| Chromium (Cr) | 13.5-16% |
| Iron (Fe) | Balance |
| Molybdenum (Mo) | 1.0-1.5% |
| Titanium (Ti) | 1.9-2.35% |
| Aluminum (Al) | 0.35% max |
Common Applications
Alloy A286 finds extensive use in various high-stress applications:
- Aircraft turbine engine components
- Afterburner parts and fasteners
- Gas turbine discs and blades
- High-temperature bolts and nuts
- Nuclear reactor components
- Industrial furnace parts
Keyword: Alloy A286 UNS S66286
Heat Treatment Process
To achieve optimal properties, Alloy A286 undergoes a specific heat treatment sequence:
- Solution annealing at 1800°F (982°C) followed by rapid cooling
- Aging at 1325°F (718°C) for 16 hours, then air cooling
- Optional double aging for enhanced properties
Advantages Over Other Superalloys
Compared to similar high-temperature alloys, Alloy A286 offers several benefits:
- Better fabricability than many nickel-based superalloys
- More cost-effective than cobalt-based alternatives
- Excellent combination of strength and ductility
- Good weldability compared to other precipitation-hardening alloys
With its unique combination of properties, Alloy A286 remains a top choice for engineers designing components that must withstand extreme temperatures while maintaining structural integrity.