The following paper explores the hot-flow behavior of Inconel 718 subjected to delta processing (DP), with various microstructures obtained by means of carrying out an initial billet forging operation prior to the heat treatment and final deformation tests. Hot compression tests were subsequently performed at 960 °C and 1020 °C at the four different strain rates of 0.001, 0.01, 0.1, and 1 s -1 . The two deformation temperatures recorded were 960 ºC and 1020 ºC, located below and above the -solvus of IN718 respectively. Microstructural characterization was performed by means of optical (OM) and scanning electron microscopy (SEM).SEM examinations suggest that the existence of the -phase prior to the application of the high deformation temperature may results in the fragmentation of the existing -phase by means of partial dissolution and/or deformation, leading to an improved grain size control.The A general classic dynamic recrystallization (DRX) behavior was observed in the flow curves, which is typical of low-medium stacking fault energy (SFE) alloys., with Tthis flow behavior was modeled according to various approaches and the results compared. Peak stress modeling was performed using two different approaches, referred to as 'apparent' and 'physically-based'. The hot-flow behavior before the peak stress was modeled according to the Estrin-Mecking-Bergstrom approach, with Avrami kinetics employed to describe the DRX behavior.
Nickel-based superalloys are extensively used in the aerospace and power generation industries due to their excellent mechanical properties at elevated temperatures and good corrosion resistance. Typically, these alloys require accomplishing critical standards during their manufacturing process. In this study, an Inconel 718 (IN718) Ni-based superalloy was subjected to a delta-processing treatment (DP718) and subsequently deformed at high temperature. Samples were compressed below and above the δ-solvus temperature at two different strain rates of 0.001 s−1 and 0.01 s−1. A detailed microstructural characterization was carried out by the electron backscattered diffraction technique (EBSD). Kikuchi patterns and the orientation relationship of the δ-phase were identified. For samples deformed above the δ-solvus at 0.01 s−1, an increase in the percentage of low angle grain boundaries (LAGB) within deformed grains and a decrease in high angle grain boundaries (HAGB) were observed. Comprehensive observation of the microstructural evolution of IN718 subjected to DP718 using orientation map images was also performed.
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