EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

Components for high temperature gas turbine applications are increasingly complex with aerodynamic shapes and internal cooling systems. These components require materials that offer a combination of excellent high-temperature strength and oxidation resistance such as nickel-based superalloys with high gamma prime (g’) volume fractions. Additive manufacturing (AM) has gained increasing interest for manufacturing these alloys which are highly susceptible to cracking during processing. This study shows the process development for a derivative of a high g’ nickel-based superalloy including successful laser powder bed fusion (LPBF) manufacturing and post-processing using hot isostatic pressing (HIP). This high boron, high zirconium containing derivative was best suited to investigate microcrack healing of strain age cracking (SAC) during HIP due to its increased cracking susceptibility. SAC was successfully suppressed by tailoring both the temperature and pressure profiles during heating of the HIP application.