Ni Based Superalloy: Waspalloy

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Ni Based SuperalloyWaspalloy

• By Klint Hoelscher
• MEEN 3344

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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.

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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

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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

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Resources Cited

• American Society for Metals, Metals Handbook.
  Desk Edition, 1985.
• Turbo Machinery Products-Rotating. 10 Oct. 2006.
  tmpGoodrich Products website.
• http//www.tmp.goodrich.com/products/rotating.sht
  ml
• Hoelscher, Bruce. Senior Maintenance Engineer,
  Valero Refining Co.
• Waspalloy Technical Data. 10 Oct. 2006. High
  Temp. Metals website.
• http//www.hightempmetals.com/techdata/hitempWasp
  aloydata.php