|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Characterizing γ’ Shape Evolution in Nickel-base Superalloys Using Lower Order Moment Invariants
||Ryan Harrison, Patrick Callahan, Tresa Pollock, Marc De Graef
|On-Site Speaker (Planned)
The γ’ phase plays a significant role in determining the tensile strength and the creep resistance of nickel-base superalloys. The influence of the surface of γ’ precipitates on dislocation motion during creep has been well established and implies that precipitate shape plays a role in determining creep behavior. Previous work on this topic has suggested that there is an optimal γ’ morphology that corresponds to improved creep properties. Therefore, understanding precipitate shape will allow for a better understanding of alloy behavior. In this work, the evolution of precipitate shapes during aging is studied for a number of experimental superalloys. Shape measurement is achieved through automated moment invariant analysis of SEM micrographs, allowing for a wide degree of shape information to be captured for a large number of precipitates. This information is compared across heat treatments and alloys to further examine the relationship between aging, composition, and γ’ precipitate morphology.
||Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)