Effects of cold rolling on the precipitation and the morphology of δ-phase in Inconel 718 alloy

Abstract

Abstract

Thermal Stability of Nanocrystalline Gradient Inconel 718 Alloy

“…Inconel 718 (IN718) is a common precipitation-strengthened Ni-based superalloy used for application in high-pressure turbine discs in jet engines [27][28][29][30][31][32][33][34][35]. However, a majority of the published works focused on wrought IN718 alloys with coarse grains [36,37].…”

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

“…Zhang et al [33] discussed the influences of γ′′ and δ phases on the high-temperature deformation behavior of Inconel 718 superalloy. Mei et al [34] discussed analyzed the effects of cold rolling on the precipitation and the morphology of δ-phase in Inconel 718 alloy. Azarbarmas et al [35] clarified that DRX behavior is the dominant dislocation restoration mechanism for Inconel 718 superalloy.…”

Effects of Different Wire Drawing Routes on Grain Boundary Character Distribution, Microtexture, δ-Phase Precipitation, Grain Size and Room Temperature Mechanical Behavior of Alloy 718

“…The binarized SEM images of the central area of the wires, evidencing δ-phase in black, are presented in Figure 4. For route A (Figure 4(a)), which involved δ precipitation during the intermediate steps, δ morphology was more fragmented, induced by migration of recrystallized grains, that cause a morphology change from acicular to spheroidal 29 , both at center and at mid-radius. The aligned distribution followed previously deformed grains, as δ tends to precipitate preferentially at grain boundaries.…”

“…Furthermore, the precipitated δ particles were fragmented in the subsequent drawing steps. Mei et al 29 reported that, as the degree of prior deformation increases, due to higher dislocation density within the grain, δ-phase particles tends to be more uniformly distributed during the heat treatment. Jeong et al 30 pointed out that cold drawing would favor the round-shaped particles, as well as a shorter annealing time.…”