Continued Developments in the Characteristics of HAYNES^® 282^® Alloy for Use in A-USC Applications

Increasing global demands for energy are spurring research efforts to improve the efficiency of fossil power plants while simultaneously reducing the emission of greenhouse gases. Current research reveals that a power plant’s efficiency increases when it is operated at Advanced Ultra Super Critical (A-USC) temperatures and pressures. These operating conditions require some plant components to be made from nickel-based superalloys. Previous research has established HAYNES^® 282^® alloy¹ (UNS N07208), a Ni-Cr-Co-Mo-Ti-Al precipitation hardenable alloy, as a viable choice for A-USC applications. For such components, current interest is focused on the development of a single step age hardening treatment. An earlier paper presented the mechanical properties of an 8-hour single step age hardening heat treatment at 800°C (1472°F)/8 hr/AC. This paper will review preliminary results of a shorter single age treatment: 800°C (1472°F)/4 hr/AC.