【摘要】 对氧化物弥散强化MGH956冷轧板材再结晶退火后可形成较为均匀细小和极其粗大两种完全不同晶粒组织状态的再结晶行为进行了研究。采用光学显微镜对冷轧板材在700~1350℃,1~120min等温退火后的组织检验结果显示:这两种晶粒组织状态的再结晶在起始和完成温度、起始形核位置、及长大速率等方面均存在显著差异,表明MGH956冷轧板材的再结晶并非仅以一种,至少可以两种不同的机制形成,并且,这两种机制还可共同发生在同一板材,导致MGH956板材再结晶组织形貌呈多样性,晶粒尺寸出现极为明显的差异。更多还原

【Abstract】 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℃ for 1 ~ 120 min 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.更多还原