Influence of Cr23C6 carbides on dynamic recrystallization in hot deformed Nimonic 80a alloys

Dynamic recrystallization (DRX) in hot deformed Nimonic 80a alloys was investigated with and without the presence of Cr23C6 carbides within grains. Average carbide sizes and dislocation configurations were investigated by transmission electron microscopy, and carbide volume fractions were estimated from small-angle X-ray scattering. A drastic decrease of DRX due to the presence of bulk carbides is found, depending on their size and volume fraction. This can be correlated to modifications of dislocation distributions due to the interactions between carbides and dislocations.