|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials for High Temperature Applications: Next Generation Superalloys and Beyond
||Development of an Oxide Dispersion Strengthened Ni-Based Superalloy Enabling Heavy Duty Gas Turbine Wheels for Improved Combined Cycle Efficiency
||Erica Sampson, Rich DiDomizio, Reza Sharghi-Moshtaghin, Sharon Huang, Andrew Detor
|On-Site Speaker (Planned)
The drive to increase combined cycle turbine efficiency from 62% to 65% for the next-generation advanced cycle requires a new heavy duty gas turbine wheel material capable of operating at 1200°F and above. This work aims to utilize oxide dispersion strengthening (ODS) to increase the strength of a solid solution strengthened Ni-based alloy and a gamma prime strengthened Ni-based alloy. Mechanical milling forces the dissolution of starting oxide powders into the metal matrix allowing for the solid state precipitation of new, nanometer scale oxides (nanofeatures) that are effective at dispersion strengthening. TEM characterization has shown the presence of fine nanofeatures present in each alloy. Altering the nanofeature type, nanofeature distribution, and processing can alter and improve the tensile strength of these ODS Ni-based alloys as compared to their baselines.