|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Gamma (FCC)/Gamma-Prime (L12) Co-Based Superalloys II
||Novel Cast and Wrought γ/γ’ Cobalt Base Superalloys - Creep Properties, Deformation Mechanisms, and Oxidation
||Mathias Göken, Lisa Freund, Steffen Neumeier
|On-Site Speaker (Planned)
γ/γ’ Co–base superalloys have become an intensely investigated material in the last few years. They are regarded as potential candidates that could replace Ni–base superalloys in some high temperature and high strength applications. These new Co-base superalloys are especially interesting candidates for polycrystalline wrought alloys, since they possess a quite low γ’ solvus temperature, which in combination with the high solidus temperature offers a wide processing and forging window. Promising new multinary γ’ hardened Co–base superalloys have been developed that can compete with the commercially available Ni–base wrought superalloys Udimet720Li and Waspaloy in terms of mechanical properties and oxidation resistance. The creep strength of the new Co-alloys is significantly better than that of the Ni-alloys. Investigations of the deformation mechanisms show that microtwinning plays an important role during creep. Oxidation tests show that the oxidation resistance is comparable or even better than that of commercial Ni-base superalloys.