With increasing the demand for higher efficiency of aircraft engines, a material which can withstand higher temperature is needed, together with good weldability, creep, and corrosion resistance. Alloy 718 has been the standard grade for several years, it provides high strength at elevated temperature. This alloy has good fabrication capability due to sluggish precipitation kinetics of its hardening phase gamma prime double prime. On the other hand temperature stability can be increased by using superalloys that are precipitation hardened by the gamma prime phase.

Haynes 282 is newly developed gamma prime precipitation hardening superalloy, which has 150°C higher temperature stability than Alloy 718. Rapid hardening of gamma prime phase can increase the susceptibility toward stain age cracking (SAC). This cracking phenomenon occurs during post weld heat treatment when residual stress relaxation coincides with the precipitation of hardening phases. Apart from rapid precipitation kinetics other factors also influence SAC resistance such as chemical composition, Al+Ti content, microstructure and grain size.

This work sets focus on grain size effects on SAC susceptibility in Haynes 282. Large grain size was found to have a positive effect on ductility when compared to mill annealed material.