Alloy 188, also known as Haynes® 188, is a high-performance, cobalt-based superalloy known for its excellent mechanical properties and resistance to high temperatures. It is widely used in industries that demand materials with superior heat and oxidation resistance, such as aerospace and gas turbine manufacturing.
Chemical Composition
The chemical composition of Alloy 188 includes:
Cobalt (Co): 37-43%
Nickel (Ni): 20-24%
Chromium (Cr): 20-24%
Tungsten (W): 13-16%
Iron (Fe): ≤ 3%
Manganese (Mn): ≤ 1.25%
Silicon (Si): ≤ 1.2%
Carbon (C): 0.05-0.15%
This combination of elements gives Alloy 188 its distinctive properties, including high strength, excellent oxidation resistance, and good ductility, even at e...
Alloy 188, also known as Haynes® 188, is a high-performance, cobalt-based superalloy known for its excellent mechanical properties and resistance to high temperatures. It is widely used in industries that demand materials with superior heat and oxidation resistance, such as aerospace and gas turbine manufacturing.
Chemical Composition
The chemical composition of Alloy 188 includes:
Cobalt (Co): 37-43%
Nickel (Ni): 20-24%
Chromium (Cr): 20-24%
Tungsten (W): 13-16%
Iron (Fe): ≤ 3%
Manganese (Mn): ≤ 1.25%
Silicon (Si): ≤ 1.2%
Carbon (C): 0.05-0.15%
This combination of elements gives Alloy 188 its distinctive properties, including high strength, excellent oxidation resistance, and good ductility, even at elevated temperatures.
Key Properties
High-Temperature Strength: Alloy 188 maintains its mechanical strength at temperatures exceeding 1093°C (2000°F). This makes it suitable for components that operate under extreme heat and stress, such as those found in gas turbines and jet engines.
Oxidation Resistance: The alloy’s high chromium content provides excellent resistance to oxidation, allowing it to perform well in high-temperature environments where other materials might fail.
Sulfidation Resistance: Alloy 188 offers strong resistance to sulfidation, a form of high-temperature corrosion that can occur in environments containing sulfur compounds. This is particularly valuable in gas turbines and other applications exposed to hot gases.
Good Formability and Weldability: Despite its strength, Alloy 188 sheet is relatively easy to form and fabricate. It can be welded using conventional techniques, making it versatile for manufacturing complex components.
Applications
Alloy 188 sheet is primarily used in industries where high-temperature performance and durability are critical. Key applications include:
Aerospace: Used in the construction of combustion chambers, exhaust systems, and afterburners in jet engines.
Gas Turbines: Employed in components such as turbine blades, combustion liners, and transition ducts.
Power Generation: Utilized in heat exchangers, furnace parts, and other high-temperature equipment in power plants.
Conclusion
Alloy 188 sheet is a vital material in industries that require materials capable of withstanding extreme temperatures and corrosive environments. Its combination of high-temperature strength, oxidation resistance, and good formability makes it an ideal choice for demanding applications in aerospace, gas turbines, and power generation.
