Ni Based Superalloy: Waspalloy

1
Ni Based SuperalloyWaspalloy
2
Background of Waspalloy

• Developed by NASA on their power recovery turbine
  blades.
• Nickel based alloy used in high heat/stress
  situations
• jet-turbine machinery
• hot gas expanders
• high temp. seals.
• Extremely resistant to corrosion by combustion
  products, up to 1600F.

3
Micro Structure

• Vacuum Induction Melting VIM
• Reduced levels of nitrogen and oxygen
• Allows for better control of Titanium and
  Aluminum alloying
• Increases forgeability
• Produced in cast and wrought forms
• FCC structure

4
Properties

• Specific Gravity-
• Waspalloy - 8.25
• Steel - 7.83
• Titanium - 4.55
• Composition-
• 57 Ni 19.5 Cr
• 13.5 Co 4.3 Mo
• 2 Fe (max) 1.4 Al
• 3 Ti .07 C
• .006 B .09 Zr
• Waspalloy retains its original composition until
  1400F while steel falls off _at_ 800F