Aircraft Structures Nickel Based Superalloys Precipitation Hardened GH4145 800°C

GH4145 Nickel Alloy Precipitation-hardened Superalloy up to 800°C Application

GH4145 is a precipitation-hardenable nickel-chromium alloy used for its corrosion and oxidation resistance and high strength at temperatures up to 1300°F. Although much of the effect of precipitation hardening is lost with increasing temperature over 1300°F, heat-treated material has useful strength up to 1800°F. GH4145 also has excellent properties down to cryogenic termperatures.

Depending on the application and the properties desired, various heat treatments are employed. For service above 1100°F, particularly where loads are to be sustained for long times, optimum properties are achieved by solution treating (2100°F) plus stabilization treating (1550°F) plus precipitation treating (1300°F). For service below 1100°F, the alloy may be strengthened by precipitation treating after hot or cold working or by precipitation treating after equalizing or solution treating. A furnace-cooling treatment is also used to develop optimum properties for some applications.

Chemical compositin

Features

•  Good creep rupture strength at high temperatures
•  Not as strong as Nimonic 90
•  Very good at cryogenic temperatures
•  Age hardenable
•  High temperature dynamic applications

Applications

•  Nuclear reactors
•  Gas turbines
•  Rocket engines
•  Pressure vessels
•  Aircraft structures

Available Product Forms
Sheet, strip, plate, round bar, flat bar, forging stock, hexagon, wire, tube and extruded