AMS 5544 is a specification of Nickel Waspaloy, which is a nickel-base age-hardenable superalloy with excellent high-temperature strength and good corrosion resistance by combustion products. This superalloy that can be used at temperatures up to 1200°F (650°C) for critical rotating applications, such as rotating parts, and up to 1600°F (870°C) for less demanding applications. It is available as plate, sheet, and strip.
The AMS 5544 specification is intended for parts that require high-temperature creep and stress rupture properties. The heat treatment is as follows:
Annealing – heat to 1975°F (1080°C), and then air cool for 30 minutes;
Solution heat treatment – heat to 1825°F (995°C) and then air cool for 2 hours;
Stabilization treatment – reheat to 1550°F (845°C), and air cool for 4 hours;
Age hardening – reheat to 1400°F (760°C), and air cool for 16 hours to produce hardness of 33-44 Rockwell C.
Please note that scale may be formed on the alloy during heat treatment in oxidizing atmospheres. However, this doesn’t affect the properties of the alloy and can be removed by acid pickling or mechanically.
AMS 5544 can be readily welded only in carefully controlled circumstances, using argon-arc methods and the Waspaloy AMS 5828 filler metal. Welds should be avoided in high-stress environments.
Hot working of AMS 5544 is done at 2140-1800°F (1170-980°C), while hydroforming, drawing, spinning, bending, and rolling can be used for cold working.