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