摘要
用透射电镜研究上贝氏体铁素体的形成。观察到贝氏体条由更小的薄片状亚单元组成。沿贝氏体铁素体条纵向靠近平直边的母相中存在间断的应变场，其间隔尺寸与薄片亚单元的厚度对应。由于亚单元的横向尺寸差构成边界轮廓台阶。相变弛豫使亚单元间界和应变场逐渐消失。
The formation of upper bainite ferrite was investigated with TEM, The much smaller lamelate subunits was obeerved.Along the longitudinal direction of the bainitc ferrite plate,interrupted strain fields existed in the parent phase near the flat edge of the bainitic ferrite plate, The spacing dimension between the strain fields corresponds to the tiuckness of lamelate subunit.The boundary contour ledges were constituted due to the size difference of the subunits in transverse direction,The stran fields and bundaries between platelets were gradually vanished through the relaxation process.
