Study on Re effect on the mechanical behavior of nickel-based single crystal superalloy
Due to its distinctive dual-phase (γ/γ′) microstructure, nickel-based single crystal superalloy (NBSCS) exhibits exceptional high temperature mechanical properties, positioning it as one of the prime candidates for gas turbine blade materials. Rhenium (Re), which plays a pivotal role in enhancing th...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2024-11-01
|
| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424027303 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Due to its distinctive dual-phase (γ/γ′) microstructure, nickel-based single crystal superalloy (NBSCS) exhibits exceptional high temperature mechanical properties, positioning it as one of the prime candidates for gas turbine blade materials. Rhenium (Re), which plays a pivotal role in enhancing the high-temperature mechanical properties, has been introduced to satisfy the increasing temperature in the combustion chamber. How to quantify the effect of Re on the high-temperature mechanical properties of NBSCSs has emerged as a crucial scientific and technical challenge. In this paper, to quantitatively characterize the mechanical properties of NBSCSs with Re doping, a dislocation density-based crystal plasticity model was developed, considering the effects of doped Re atoms on dislocation slipping resistance within the dual-phase microstructure as well as the entry of dislocation into the γ′ precipitate. Moreover, the diffusion of Re in the lattice was specially considered. By performing crystal plastic finite element simulations on a representative volume element model containing γ and γ′ phases, Re doping induced effects on both uniaxial tension/compression and prolonged creep of NBSCSs were quantitatively studied. The enhancement of flow stress and creep resistance is attributed to the increased dislocation slipping resistance induced by Re doping. Furthermore, the Re diffusion can further enhance the creep resistance of NBSCSs. The results provide valuable insights into understanding the effects of Re and their underlying mechanisms, offering guidance for optimizing Re doping in NBSCSs. |
|---|---|
| ISSN: | 2238-7854 |