|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deformation and Damage Mechanisms in High Temperature Ni, Co and Fe-based Superalloys
||Are Ni-based SX Superalloys Always Stronger in Creep?
||Louis Thébaud, Patrick Villechaise, Jonathan Cormier, Coraline Crozet, Alexandre Devaux, Denis Béchet, Jean-Michel Franchet, Anne-Laure Rouffié, Mike Mills
|On-Site Speaker (Planned)
Creep properties at 700°C, 850°C and 900°C of the newly developed AD730TM superalloy have been studied using <001> single crystalline specimens as well as, super-solvus and sub-solvus treated samples extracted from a forged bar. A special attention has been paid to obtain the same intragranular γ’ precipitation between super-solvus treated and SX specimens. As a striking result, SX specimens only perform better compared to super-solvus treated ones for long-term tests at 900°C, when oxidation has a major contribution to the damage mechanisms. At lower temperatures, a decrease of the creep rate at the beginning of the tests using polycristalline specimens is observed while almost no strain rate decrease is observed for SX specimens. It is hence unambiguously shown a grain boundary strengthening mechanism. In this presentation, the role of grain boundaries in improving the creep strength will be analyzed, using also SX specimens whose γ’ precipitation has been tailored purposely.
||Planned: Supplemental Proceedings volume