0.02 – 0.10
18.00 – 21.00
12.00 – 15.00
3.5 – 5.0 max
1.0 – 1.5
2.6 – 3.25
0.003 – 0.008
General characteristics of Waspalloy
Waspalloy is a precipitation-hardening nickel-based alloy, with high chromium and cobalt contents and additions of molybdenum, aluminum and titanium. The alloy is used at temperatures up to 1600ºF (870ºC) and shows good strength and oxidation resistance at these elevated temperatures. The alloy is normally vacuum-induction melted and consumable electrode-remelted.
Waspalloy is used in gas turbines and aircraft jet engines at temperatures up to 1600ºF (870ºC) above which temperature intergranular oxidation occurs.
Material to be forged should be soaked at a temperature not to exceed 2150ºF (1175ºC) and the temperature of the work piece should not be allowed to exceed this temperature during forging. Forging should not be performed below a temperature of 1850ºF (1010ºC) and the alloy is normally air cooled after forging.
There are several combinations of solution treatment, stabilizing treatment and age hardening for this alloy, depending upon property requirements, but a typical treatment cycle would be:
Solution treat at 1875/1900ºF (1024/1037ºC) for 4 hrs and air cool.
Stabilize at 1550ºF (845ºC) for 4 hrs and air cool.
Age at 1400ºF (760ºC) for 16 hrs and air cool.
The solution-treated condition gives best machinability, and rigid, powerful machines, cemented carbide tools and positive feeds are all called for.
The alloy should be in the solution treated condition for welding. Cleanliness is of prime importance, as is protection of molten metal from atmospheric corrosion (by, for example, argon). All welded parts should be re-solution treated.
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