|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials for High Temperature Applications: Next Generation Superalloys and Beyond
||Improvement of Creep Resistance at 950 °C/400MPa in Ru-containing Single Crystal Superalloys
||Jiajie Huo, Qianying Shi, Qiang Feng
|On-Site Speaker (Planned)
Microstructure features, including γ' volume fraction, γ-γ' lattice misfit, γ channel width, as well as dislocation substructure had significant influence on the creep performance in Ni-base single crystal superalloys. In this study, creep ruptured and interrupted tests (0.5% and 1.0% creep strain) were taken at 950 °C/400MPa and the microstructural features were quantified to characterize in two single crystal superalloys containing high level of Co and different levels of Mo and Ru additions. The alloy with high level additions of Mo and Ru exhibited more negative γ-γ´ lattice misfit and better creep performance. Large amounts of stacking faults were observed in the γ matrix after 0.5% creep strain and they were considered as a major factor to improve the creep performance. This study is helpful to understand the effect of microstructure on creep performance and get better knowledge of physical metallurgy in Ru-containing single crystal superalloys.