LEDGE STRUCTURE ON BROAD FACES OF FERRITE PLATES IN LOWER BAINITE

Abstract

Abstract: 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.

Key words: bainitic ferrite, ledge, mechanism, broad face

JIN Qiang FANG Hongsheng CAO Jianjun ZHENG Yankang CHEN Xiuyun Tsinghua University,Beijing,China Present adress: Central Iron and Steel Research Institute,Ministry of Metallurgical Industry,Beijing,100081,China. LEDGE STRUCTURE ON BROAD FACES OF FERRITE PLATES IN LOWER BAINITE[J]. Acta Metallurgica Sinica (English Letters), 1991, 4(3): 155-160.

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LEDGE STRUCTURE ON BROAD FACES OF FERRITE PLATES IN LOWER BAINITE

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