Alloy 188 is a high-performance cobalt-nickel-chromium-tungsten superalloy, recognized for its remarkable strength and corrosion resistance at elevated temperatures. Sold under various brand names such as Nickel Alloy 188, Haynes® 188, and Udimet® 188, this alloy is favored in demanding applications, particularly in the aerospace and gas turbine industries.
Composition:
- Cobalt (Co): Balance (approximately 39%)
- Nickel (Ni): 20-24%
- Chromium (Cr): 21-23%
- Tungsten (W): 13-15%
- Manganese (Mn): 1.25% max
- Iron (Fe): 3% max
- Lanthanum (La): Trace amounts
Key Properties:
- High-Temperature Strength: Maintains excellent strength at temperatures up to 2000°F (1095°C).
- Oxidation Resistance: Provides robust resistance to oxidation, suitable for prolonged high-temperature exposure.
- Sulfidation Resistance: Offers strong resistance to sulfidation, which is critical in sulfur-containing environments.
- Corrosion Resistance: Exhibits good resistance to general corrosion, enhancing its durability.
- Ductility and Stability: Demonstrates outstanding ductility and metallurgical stability, making it versatile for various fabrication processes.
- Weldability: Compatible with several welding methods including TIG, MIG, electron beam, and resistance welding.
- Fabricability: Can be readily fabricated through both cold and hot working processes.
Applications:Alloy 188 is extensively used in high-temperature aerospace and gas turbine engine components, including:
- Flame Holders
- Transition Ducts
- Afterburner Liners
- Combustion Cans
- Spray Bars
Fabrication and Forming:
- Cold Working: Alloy 188 can be cold worked; however, it work-hardens rapidly, necessitating frequent intermediate annealing for complex shapes.
- Hot Working: Hot working is typically performed at temperatures between 1900°F and 2300°F.
- Heat Treatment: Solution heat treatment is carried out at 1163-1191°C, followed by rapid cooling to maintain optimal properties.
Supply Forms:Continental Steel supplies Nickel Alloy 188, Haynes® 188, and Udimet® 188 in various forms, including:
- Bars
- Strips
- Sheets
- Wires
Conclusion
Alloy 188 is a versatile, high-strength, and corrosion-resistant superalloy, ideal for extreme-temperature applications in the aerospace and gas turbine sectors. Its excellent fabricability, weldability, and stability make it a top choice for manufacturers seeking reliable performance in challenging environments.
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