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通过光学显微分析和显微硬度测试研究了冷变形对9Cr低活化马氏体钢显微组织的影响,以及冷变形后退火再结晶过程中冷变形量(5%~75%)、退火温度(700~810℃)和保温时间(15~150 min)对显微组织的影响,获得退火再结晶图。当变形量为5%和10%时,样品在810℃的高温下退火120 min只发生回复过程;当变形量大于20%时,在780℃下退火120 min即可获得再结晶组织;当变形量达75%时,退火再结晶组织具有带状结构。通过试验获得了最佳的冷变形及退火再结晶工艺:冷变形量20%~60%,退火温度750~780℃,退火时间60~120 min。
The effects of cold deformation on the microstructure of 9Cr low-activation martensitic steel were studied by optical microscopic analysis and microhardness test, and the cold deformation (5% ~ 75%) during annealing after cold deformation was annealed (700 ~ 810 ℃) and holding time (15 ~ 150 min) on the microstructure of the obtained annealing recrystallization. When the amount of deformation is 5% and 10%, the sample annealed at 810 ℃ for 120 minutes only reverts. When the amount of deformation is more than 20%, the sample recrystallizes at 780 ℃ for 120 minutes. When the deformation At 75%, the annealed recrystallized structure has a banded structure. The best cold deformation and annealing recrystallization process were obtained through experiments: cold deformation 20% ~ 60%, annealing temperature 750 ~ 780 ℃, annealing time 60 ~ 120 min.