|About this Abstract
||10th International Symposium on Superalloy 718 and Derivatives (2023)
||Superalloy 718 and Derivatives
||Effect of Heat Treatment on the Mechanical Property and Deformation Mechanism of a Novel Cast Nickel-base Superalloy
||Pengfei Zhao, Min Wang, Xianchao Hao, Weiwei Xing, Meiqiong Ou, Yingche Ma, Kui Liu
|On-Site Speaker (Planned)
A novel cast nickel-base superalloy named K4800 is developed, which can be used at 800-850℃. The yield and ultimate tensile strengths of K4800 can reach 780 and 910Mpa at 800℃ with an elongation no lower than 7%, and the creep life of K4800 is generally not less than 120h under 870℃/255MPa. Meanwhile, this material has outstanding microstructural stability at 800 and 850℃ without the precipitation of σ and η phase during long-term aging. The microstructure of K4800 consists of γ, MC, M23C6, and the γ' in two sizes, following the heat treatment of solution annealing plus double-stage aging. Accurate control of the content and proportion of the γ' phases in two dimensions is the key to obtaining an optimal mechanical property of K4800. With the decrease of large-sized and the increase of small-sized γ' in content, the material is gradually strengthened by paired dislocations shearing without an apparent ductility drop.
||Definite: At-meeting proceedings