|About this Abstract
||10th International Symposium on Superalloy 718 and Derivatives (2023)
||Superalloy 718 and Derivatives
||Tensile Performance of Direct Energy Deposited IN718 and Oxide Dispersed Strengthened IN718
||Kyle Rozman, Bruce Kang, Ímer Doğan
|On-Site Speaker (Planned)
With needs to increase efficiencies, operational temperatures of components must increase. Oxide dispersion strengthening (ODS) has proven useful increasing the operational temperature of steels. Yttria Oxides (Y2O3) particles were mechano-chemical bonded (MCB) to IN718 powder to investigate the ability of IN718 to be strengthened by ODS particles at temperatures above 1000░C. The Y2O3 infused IN718 powder was direct energy deposited using two parameter sets for testing. Additionally, plates of standard IN718 power were built using the same deposition parameters for reference. Specimen blanks were cut from plates and tested as built, with 1080░C and 1200░C homogenization heat treatments.
The initial microstructure for all four conditions was dendric with significant Mo, Nb and Ti separation. Homogenization was observed to break up the initial large Mo and Nb precipitates and form Mo, Nb and Ti rich spherical precipitates. Further the 1080░C homogenization heat treatment retained the dendritic structure while the 1200░C was observed to partially recrystallize the grain structure. Minor improvements in the tensile properties were observed at 1050░C by additions of Y2O3. This suggests with further optimization IN718 may be utilized at temperatures above 1000░C with ODS strengthening methods.
||Definite: At-meeting proceedings