|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deformation and Damage Mechanisms in High Temperature Ni, Co and Fe-based Superalloys
||High Resolution Deformation Mapping Studies of the Deformation of a Ni Superalloy
||Joao Fonseca, Allan Harte, Thomas Armitage, Alberto Orozco-Caballero
|On-Site Speaker (Planned)
The mechanical performance of Ni superalloys is ultimately controlled by plasticity at the microstructural scale, the character of which is strongly affected by the microstructure. In polycrystalline alloys, this includes interactions with different kinds of precipitates, inclusions, grain boundaries and even prior deformation substructure. Although there is sound empirical knowledge of how different microstructural characteristics affect creep and fatigue performance, the underlying mechanisms are not well understood. In this paper we show how recent developments in high resolution deformation mapping are providing new insights into these mechanisms. Results from a number of recent experiments are presented, combining HRDIC, EBSD and in some cases ECCI imaging. The experiments probe the effects of gamma prime size, grain size and grain boundary morphology and the deformation around notches and cracks, at both room and elevated temperature. These findings are discussed in the context of the currently accepted deformation mechanisms in these alloys.
||Planned: Supplemental Proceedings volume