|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deformation and Damage Mechanisms in High Temperature Ni, Co and Fe-based Superalloys
||Microstructural Investigation and In-situ Neutron Diffraction on Novel Creep-resistant Ferritic Superalloys
||Peter Liaw, Shao-Yu Wang, Gian Song, David Dunand, Gautam Ghosh, Sungil Baik
|On-Site Speaker (Planned)
Novel ferritic superalloys have been developed for the application of ultra-supercritical fossil-energy (FE) power plants, in order to improve the efficiency of plants. Ferritic alloys with the composition of Fe-6.5Al-10Cr-10Ni-(2, 4)X-3.4Mo-0.25Zr-0.025B (wt. %, X=Ti, Hf, and Zr) have been investigated, via electron microscopy, APT, and In-situ ND techniques. The microstructural investigations of these alloys showed that, with Ti the major strengthener (precipitate) can be changed from B2 to L21 phase, which greatly improves the creep resistance of the alloys as shown in the In-situ ND tests, which an obvious load transfer effect. However, with Hf and Zr, the major strengthener remains as B2 phase, and ND results do not show a clear load transfer effect. The APT results suggest that Hf and Zr deposit majorly along the grain boundary and formed Laves Phase, instead of forming L21 phase as desired.
||Planned: Supplemental Proceedings volume