|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Energy Materials 2017: Materials for Gas Turbines
||Grain Refinement of Cast FeAl-Alloys for Gas Turbine Blades
||Heiner Michels, Thomas Brenker, Laura Klinkenberg, Matthias Buenck
|On-Site Speaker (Planned)
Flexible power plants are required to compensate fluctuations in an electricity grid primarily based on sustainable energy. Gas turbines offer this flexibility, namely by short start-up times, their suitability for frequent load changes and an overall efficiency of around 60%. The blades in the back turbine stages are often made from high alloyed chromium steels suitable for operating temperatures at around 620 °C. Due to the high costs of these alloys, alternative materials are in demand. FeAl intermetallics are suitable for the said temperatures, of lower density and available at lower cost. However, the low ductility at room temperature is a significant problem. The current work presents results of a study aiming at increasing the mechanical and casting properties of FeAl-cast parts by means of grain refining FeAl-alloys. The study comprises tests of grain refiners and refining methods as well as analytical results of the achieved microstructures.
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