Waspaloy

Tail of TSR-2, showing the unpainted Waspaloy fairing

Waspaloy is a registered trademark of United Technologies Corp[1] that refers to an age hardening austenitic (face-centred cubic) nickel-based superalloy. Waspaloy alloy is typically used in high temperature applications, particularly in gas turbines.

Nominal composition

Nickel 58%, chromium 19%, cobalt 13%, molybdenum 4%, titanium 3%, aluminium 1.4%[2]

Chemistry Table

Cr Ni Mo Co Al Ti B C Zr Fe Mn Si P S Cu
MIN 18.00 -- 3.50 12.00 1.20 2.75 0.003 0.02 0.02 -- -- -- -- -- --
MAX 21.00 Balance 5.00 15.00 1.60 3.25 0.01 0.10 0.08 2.00 0.10 0.15 0.015 0.015 0.10

[3]

Properties

Waspaloy is an age-hardenable, nickel-based superalloy with excellent strength properties through temperatures of roughly 980°C (1800°F). Other characteristics of Waspaloy include good corrosion resistance, as well as being relatively impervious to oxidation making it well suited for service in extreme environments.[4]

Waspaloy has useful strength at temperatures up to 760-870°C (1400-1600°F), and good oxidation resistance in gas turbine engine atmospheres up to 870°C (1600°F). The creep rupture strength of Waspaloy is superior to that of Alloy 718 at temperatures above 620-650°C (1150-1200°F). Short time hot tensile strength is inferior to RA718 at temperatures up to 730°C (1350°F).[3]

Uses

Waspaloy is often encountered in extreme environments. It is common in gas turbine blades, seals, rings, shafts and turbine disks.[3] The NIST certified reference material 1243, a standard for X-ray fluorescence spectroscopy, is made from Waspaloy.[5]

The British Aircraft Corporation TSR-2, a supersonic strike aircraft developed from the late 1950s, had a fairing to its rear fuselage around the exhaust nozzles. Owing to the high temperatures in this area, the fairing was formed of Waspaloy and left unpainted. Fabrication of this alloy was described as 'very intractable' and was carried out by the engine specialists Bristol, rather than the airframe builders BAC.[6]

References

  1. ↑ Haynes International
  2. ↑ , Data Sheet
  3. 1 2 3 "Waspaloy Alloy Page". Waspaloy - Rolled Alloys Inc. Rolled Alloys Inc. Retrieved 17 April 2013.
  4. ↑ , Haynes Waspaloy data sheet
  5. ↑ National Institute of Standards and Technology, SRM 1243 - Ni-Cr-Co Alloy UNS N07001 (disk form), 17 Dec 2012.
  6. ↑ Baxter, Alan (1990). Olympus - the first forty years. R-RHT. pp. 95,98. ISBN 0-9511710-9-7. Historical, 15.
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