|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deformation and Damage Mechanisms in High Temperature Ni, Co and Fe-based Superalloys
||Mechanical Properties and Deformation Mechanisms of Polycrystalline L12-strengthened Co-based Superalloys
||Steffen Neumeier, Lisa P. Freund, Mathias Göken
|On-Site Speaker (Planned)
Polycrystalline Ni-based superalloys are essential materials for disks in the hottest sections of turbines engines. To increase the efficiency of turbines, new disk materials with a higher temperature capability are needed. Recently, new multinary γ'-hardened Co-base superalloys have been developed that have a large processing window and excellent mechanical properties at high temperatures. Their creep strength is higher than that of commercially available Ni-base wrought alloy Udimet720Li. In this paper the microstructures, mechanical properties and deformation mechanisms of different polycrystalline Co-base superalloys are presented and discussed. The investigation of the deformed microstructure in the transmission electron microscope revealed that the formation of superlattice stacking faults and microtwinning are the prevailing deformation mechanism and that segregation of elements within the γ' phase plays a key role.
||Planned: Supplemental Proceedings volume