用等径弯曲通道变形(equal-channel angular pressing简称ECAP)法制备出超细晶低碳钢材料,并在不同退火条件下研究其组织的热稳定性.研究表明,在200～500℃之间退火时,材料组织处于回复阶段,其铁素体晶粒几乎没有长大,晶粒尺寸约0.4pm;在550℃退火时,铁素体组织由较大的再结晶晶粒和细小的未再结晶晶粒组成;在550℃相同条件下退火时,变形试样中的渗碳体与热轧态试样中的渗碳体相比,前者球化能力明显增强;600℃退火时再结晶完成.
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