|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Energy Materials 2017: Materials for Gas Turbines
||Rejuvenation of a Co Based Superalloy to Prevent the Quickest Microstructural Degradation during the Following Operating Cycle
||Erica Vacchieri, Giacomo Roncallo, Gabriele Cacciamani, Alessio Costa
|On-Site Speaker (Planned)
The rejuvenation of an old generation Co based superalloys was developed to recover the alloy starting microstructure and to prevent its quicker degradation during the following service cycle of a GT first stage vane. An in-house thermodynamic database was developed to predict the martensitic fcc-hcp transformation of the alloy matrix during service and it was validated through experimental tests. The dissolution of hcp phase happens at temperature above 800°C but the martensitic transformation leaves some sub-grain microstructure that improves the hcp precipitation during the following service cycle. Several operated components were considered and a rejuvenation process was designed in order to remove the sub-structure from the alloy and prevent the quicker transformation during the following operating period.
||Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)