Recrystallization of Oxide Dispersion Strengthened MGH956 Cold Rolled Sheet

Recrystallization behaviors of oxide dispersion strengthened MGH956 cold rolled sheet that are able to form two kinds of entirely different crystal grain structure,rather uniformly fine and extremely coarse,were investigated. Microstructures of cold rolled sheets isothermally annealed at 700~1350 degree C for 1~120min were examined by optical microscopy. Results show that recrystallization initial and finish temperatures, onset nucleation sites, and grain growing speeds of the two kinds of grain structure are obviously different, which indicates that recrystallization formation mechanism of MGH956 cold rolled sheet is not merely by one, but at least by two models, and they are able to occur jointly within one sheet. All of those result in diversity on structure morphologies and extreme differences on grain size of MGH956 sheet recrystallized.