|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Microstructure Evolution during Thermal Aging of Inconel 718
||Rajakumar Sidharada Devarapalli, Jonathan Cormier, Mustapha Jouiad
|On-Site Speaker (Planned)
The Inconel 718 super-alloy was subjected to isothermal and cyclic thermal annealing at 7500C to assess its expected use at higher temperatures. Microstructure evaluation during isothermal annealing and thermal cycling was investigated by different imaging techniques. According to High Resolution Scanning Transmission Electron Microscopy (HRSEM and HRTEM) results, all the annealed samples showed the coarsening of both γ’ and γ” precipitates by “Lifshitz, Slyozov & Wagner” (LSW) and ledge mechanisms respectively. The volume fraction of γ’, γ” and δ phases were measured from Electrons Backscattered images and results were correlated with annealing time. The phases identification and orientation relationship of precipitates were studied by analytical and HRTEM and correlated to coarsening mechanisms. The ledge growing mechanism seems to be controlled by both diffusion of solute atoms attach to precipitate at the incoherent interface and the orientation of the γ” precipitates with respect to the γ matrix.
||Planned: A print-only volume