| Abstract Scope |
Nickel-base Alloy 625 is used in energy-generation applications due to its strength and corrosion resistance at elevated temperatures. However, thermomechanical processing of the alloy can be challenging, leading to the development of variable microstructures within large monolithic forgings. This can result in unpredictable mechanical properties. As a result, there is a need to understand the behaviour of nickel-base alloys during forging operations. In this study, the microstructural evolution in Alloy 625 has been evaluated during laboratory-scale deformations performed at temperatures, strains and strain rates of interest to industry. Typically, these alloys readily undergo dynamic recrystallization during compression, which, if not fully completed, results in unfavourable partially recrystallized microstructures. In order to avoid these regimes, experiments have been performed to assess recrystallization kinetics for Alloy 625. Microstructural characterization using SEM, TEM and EBSD has been performed on compression specimens to develop understanding of the effect of thermomechanical processing on microstructural evolution. |