Waspaloy

Description

Waspaloy (UNS N07001/W. Nr. 2.4654) is a nickel- base, age hardenable superalloy with excellent high- temperature strength and good corrosion resistance, notably to oxidation, at service temperatures up to 1200°F (650°C) for critical rotating applications, and up to 1600°F (870°C) for other, less demanding, applications. The alloy’s high-temperature strength is derived from its solid solution strengthening elements, molybdenum, cobalt and chromium, and its age- hardening elements, aluminum and titanium. Its strength and stability ranges are higher than those typically available for alloy 718.

Special Metals offers Waspaloy made by vacuum induction melting and vacuum arc refining (VIM/VAR) or by vacuum induction melting and electroslag refining (VIM/ESR). The manufacturing process is selected to meet specific customer requirements and final service applications. An even higher strength “super Waspaloy” chemistry is available, a unique composition to provide higher strength properties for more demanding applications.

 

Special Metals Waspaloy is used for gas turbine

Table 1 – Limiting Chemical Composition^a, %^b Chromium 18.00-21.00

Boron……………………………………………………………. 0.003-0.01

Zirconium………………………………………………………… 0.02-0.12

Aluminum………………………………………………………… 1.20-1.60

Titanium………………………………………………………….. 2.75-3.25

Molybdenum……………………………………………………. 3.50-5.00

Cobalt………………………………………………………….. 12.00-15.00

Copper…………………………………………………………… 0.50 max.

Iron………………………………………………………………… 2.00 max.

Sulfur…………………………………………………………….. 0.030 max.

Silicon……………………………………………………………. 0.75 max.

Manganese…………………………………………………….. 1.00 max.

Carbon ………………………………………………………0.02-0.10 max.

Phosphorus…………………………………………………… 0.030 max.

Nickel………………………………………………………………. Balance^c

 

^aCommercial chemistries for specific applications are usually much tighter and defined to meet customer requirements on individual orders.

^bIn compliance with UNS N07001.

^cReference to the balance of the alloy’s composition does not guarantee this is exclusively of the element mentioned but that it predominates and others are present only in minimal quantities.

 

and corrosion resistance at high operating temperatures. Current and potential applications include compressor and rotor discs, shafts, spacers, seals, rings and casings, fasteners and other miscellaneous engine hardware, airframe assemblies and missile systems.

Melting Range……………………… ..1330-1360°C (2425-2475°F)

 

Coefficient of Thermal Expansion

At 70-200°F (21-93°C)…………………………….. 6.8 x 10^-6 in/in/°F

At 70-1000°F (21-538°C)…………………………. 7.7 x 10^-6 in/in/°F

At 70-2000°F (21-1093°C)……………………… 10.4 x 10^-6 in/in/°F

 

conditions of frequent thermal cycling, and in continuous exposure to temperatures up to 1900°F (1038°C). It has performed well in atmospheres found in gas turbine engine service and in salt spray environments. Solution-treated material offers the best levels of corrosion resistance.

 

Publication Number SMC-011

Copyright © Special Metals Corporation, 2004 (Sept 04)

 

The data contained in this publication is for informational purposes only and may be revised at any time without prior notice. The data is believed to be accurate and reliable, but Special Metals makes no representation or warranty of any kind (express or implied) and assumes no liability with respect to the accuracy or completeness of the information contained herein. Although the data is believed to be representative of the product, the actual characteristics or performance of the product may vary from what is shown in this publication. Nothing contained in this publication should be construed as guaranteeing the product for a particular use or application.

Electrical Resistivity Solution treated at

1080°C (1975°F)/4h/AC…. 1.24 microhm•m (0.38 microhm•ft)

Fully age hardened,

i.e. solution treated +…….. 1.20 microhm•m (0.37 microhm•ft)

845°C (1550°F)/24h/AC +

760°C (1400°F)/16h/AC

 

Modulus of Elasticity (Dynamic)

At 70°F (21°C)……………………………… 30.3 x 10³ ksi (211 GPa)

At 1000°F (538°C)………………………… 26.7 x 10³ ksi (184 GPa)

At 1600°F (871°C)………………………… 22.7 x 10³ ksi (157 GPa)

 

Magnetic Permeability

H = 200 oersteds (solution treated + aged)…………………. 1.004