Competition between work-hardening effect and dynamic-softening behavior for processing as-cast GH4720Li superalloys with original dendrite microstructure during moderate-speed hot compression

A new dynamic recrystallization kinetics model for a Nb containing Ni-Fe-Cr-base superalloy considering influences of initial δ phase

“…The preferred properties of Ni-Fe-Cr-base superalloys are highly related to the hot forming processes [3,4]. During hot forming, the DRX behaviors of Ni-Fe-Cr-base superalloys are highly intricate owing to the multiple alloying compositions [5,6,7,8]. Meanwhile, the complex microstructure, large deformation resistance, and narrow forming temperature range make hot forming processes very complicate [ 9 , 10 ].…”

Creep-fatigue behavior of turbine disc of superalloy GH720Li at 650 °C and probabilistic creep-fatigue modeling

“…As a consequence, creep-fatigue is the dominant damaging mode for a turbine disc, which is the life limiting damage to be considered in the design of a turbine disc [1][2][3]. GH720Li (in Chinese series, similar to Udimet 720Li in the series of U.S.A), a Ni based γ′ strengthened superalloy, is one of the most successful superalloys for turbine discs for a long-term employ at 650-750°C due to its excellent creep, fatigue, oxidation and corrosion resistance at high temperatures [4,5]. Therefore, the creep-fatigue behavior of turbine discs of superalloy GH720Li is the focus of this investigation by performing creep-fatigue experiments with different dwell times at the maximum load.…”

Study of the Dynamic Recrystallization Process of the Inconel625 Alloy at a High Strain Rate

“…The bulging of initial grain boundaries is the main nucleation mechanism of dynamic recrystallization (DRX). Other studies have focused on the work-hardening behavior of nickel-based superalloys during hot deformation, and the constitutive model based on the stress–strain relationship [14,15,16,17,18,19,20,21,22,23,24,25]. The hot deformation behaviors of the Ni-based superalloy are investigated by tensile and compressional tests over a wide range of strain rates and deformation temperatures.…”