热变形奥氏体动态再结晶的组织表征  

Microstructure Characterization of Dynamic Recrystallization in Hot Deformed Austenite

作　　者：韩宝军 

机构地区：[1]赣南师范学院化学化工学院,江西赣州341000

出　　处：《热加工工艺》2015年第4期110-112,119,共4页Hot Working Technology

摘　　要：研究了Fe-32%Ni合金奥氏体在1000℃、形变速率2×10-3 s-1试验条件下高温变形时的微观组织特征及其演变过程。采用光学显微镜(OM)、电子背散射衍射(EBSD)和透射电镜(TEM)对组织结构进行分析。结果表明:热变形奥氏体发生了不连续动态再结晶,根据形变奥氏体晶粒的位错分布特征,热变形动态再结晶晶粒分为3类:一是位错密度很低的细小晶粒;二是具有位错密度梯度的晶粒;三是高密度位错大体均匀分布的晶粒。The microstructure characterization and evolution of Fe-32%Ni alloy hot deformed at 1000℃ and strain rate of2 ×10^-3s-1were investigated. The deformed microstructure was characterized by optical microscope（OM）, electron back scatter diffraction（EBSD） and transmission electron microscope（TEM）. The results show that the discontinuous dynamic recrystallization takes place. According to the characteristics of dislocation distribution, the deformed microstructure can be categorized into three kinds： the fine grains with low dislocation density, the grains with dislocation density gradient; and the grains with high dislocation density uniformly distributing.

关 键 词：Fe-32%Ni合金 奥氏体 动态再结晶 电子背散射衍射 

分 类 号：TG146.8[一般工业技术—材料科学与工程]