|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials for High Temperature Applications: Next Generation Superalloys and Beyond
||F-57: Long-term Thermal Stability of Nickel-base Superalloys
||Alison S Wilson, Mark Hardy, Howard Stone
|On-Site Speaker (Planned)
||Alison S Wilson
The long-term thermal stability of the nickel-base superalloys used for turbine discs is an issue of increasing importance as the latest alloys designed to meet the requirements of future gas turbine engines contain high refractory element contents and γʹ volume fractions. The formation of topologically close-packed (TCP) phases in such alloys is frequently investigated but little attention has been paid to TCP solvus temperatures. In this study, a series of model alloys with systematic compositional variations have been designed that are unstable with respect to TCP precipitation at 800°C. XRD and SEM have been used to determine the identity, morphology and extent of TCP phases following thermal exposure and the TCP solvus temperatures have been measured using DSC. These measured solvus temperatures have been compared with thermodynamic predictions to assess the accuracy of the predictions. This work was supported by Rolls-Royce plc and EPSRC (EP/H022309/1, EP/H500375/1 & EP/M005607/1).