LEDGE STRUCTURE AT BROAD FACES OF FERRITE PLATES IN LOWER BAINITE
下贝氏体铁素体宽面上的台阶结构

The ferrite/austenite interfacial structure in lower bainite has been studied in a hypereutectoid steel by means of electron microscopy. It is found that mobile growth ledges and superledges and their three-dimensional morphologies exist at the broad faces of ferrite plates in lower bainite, and that growth ledges can also evolve from structural ledges. These provide evidence to the ledge growth mechanism of lower bainite.