摘要
用等径弯曲通道变形 (equal channelangularpressing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 2 0 0～ 5 0 0℃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 4 μm ;在 5 5 0℃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 5 5 0℃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 ;6 0 0℃退火时再结晶完成。
Equal-channel angular pressing (ECAP) is a novel plastic working method for fabricating ultrafine-grained (UFG) materials. The UFG low carbon steel was fabricated by applying ECAP and the thermal stability of the microstructures during annealing at different temperatures was investigated. Annealing at temperatures of 200°C-500°C, a recovery process was dominant in ferrite microstructure and the ferrite grains of 0.4 μm remained unchanged. Annealing at 550°C, the ferrite microstructure consisted of larger recrystallized grains and ultrafine unrecrystallized grains. Under the same annealing condition of 550°C for 1 h, microstructure of pearlite was characterized by the enhanced spheroidization of cementite for the sample processed by ECAP compared with the unpressed sample. Annealing at 600°C, the recrystallization was fully completed.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2004年第2期11-14,共4页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金资助项目 (1 599740 1 81 )
