Abstract
High-temperature compression and electron backscatter diffraction (EBSD) techniques were used in a systematic investigation of the dynamic recrystallization (DRX) behavior and texture evolution of the Inconel625 alloy. The true stress–true strain curves and the constitutive equation of Inconel625 were obtained at temperatures ranging from 900 to 1200 °C and strain rates of 10, 1, 0.1, and 0.01 s−1. The adiabatic heating effect was observed during the hot compression process. At a high strain rate, as the temperature increased, the grains initially refined and then grew, and the proportion of high-angle grain boundaries increased. The volume fraction of the dynamic recrystallization increased. Most of the grains were randomly distributed and the proportion of recrystallized texture components first increased and then decreased. Complete dynamic recrystallization occurred at 1100 °C, where the recrystallized volume fraction and the random distribution ratios of grains reached a maximum. This study indicated that the dynamic recrystallization mechanism of the Inconel625 alloy at a high strain rate included continuous dynamic recrystallization with subgrain merging and rotation, and discontinuous dynamic recrystallization with bulging grain boundary induced by twinning. The latter mechanism was less dominant.
Highlights
Due to its strength at high temperatures, structural stability, oxidation resistance, and resistance to hot corrosion, the Inconel[625] alloy is widely applied in aerospace, nuclear power, shipbuilding, and other industrial fields
The results indicate that both discontinuous dynamic recrystallization place during hot deformation
It was evident that the temperature and strain rate had the most most important effect on the flow behavior of the Inconel[625] alloy
Summary
Due to its strength at high temperatures, structural stability, oxidation resistance, and resistance to hot corrosion, the Inconel[625] alloy is widely applied in aerospace, nuclear power, shipbuilding, and other industrial fields. The Inconel[625] alloy has a narrow range of thermoforming parameters, a complex composition, and a high deformation resistance. This results in poor processing stability, where uneven stress and temperature distribution, and difficulties in controlling the extrusion process result in the occurrence of bursting—especially for extrusion at a high deformation rate and in the formation of thin-walled tubes. Some studies have investigated the microstructure analysis and hot deformation behavior of nickel-based superalloys [1–13]. In these studies, optical microscopy (OM), transmission electron microscopy (TEM), electron backscatter diffraction (EBSD), and other analytical techniques were used to study the grain morphology, grain boundary evolution, and dynamic recrystallization nucleation mechanism of Materials 2019, 12, 510; doi:10.3390/ma12030510 www.mdpi.com/journal/materials nickel-based superalloys under different hot deformation conditions. The hot deformation parameters havedeformation significant influences the significant grain microstructure
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