J. Mater. Sci. Technol. ›› 1998, Vol. 14 ›› Issue (6): 559-563.

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Three Dimensional Morphology and Microstructural Evolution of Bainite in Steels

Xangzheng BO; Hongsheng FANG and Jiajun WANG(Dept. of Materials Science and Engineering, Tsinghua University, Beijing 100084, China)   

  • 收稿日期:1998-11-28 修回日期:1998-11-28 出版日期:1998-11-28 发布日期:2009-10-10

Three Dimensional Morphology and Microstructural Evolution of Bainite in Steels

Xangzheng BO; Hongsheng FANG and Jiajun WANG(Dept. of Materials Science and Engineering, Tsinghua University, Beijing 100084, China)   

  • Received:1998-11-28 Revised:1998-11-28 Online:1998-11-28 Published:2009-10-10

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摘要： 1.IotroductionInl964,oblakll]eInPfoyeddual-surfaCemetallograPhybylightopticalnilcroscoPy(LoM)toconIirInthatthethreedimensional(3-D)morphologyoffowrbdriteislentoidorplate-llke.LOMdual-schceob-servationonlowerbainiteinanFe-7.9Cr1.11C(wtpct)steell2]indicatedthatthetwrvdiJnensional(2-D)morphologyisacictilar,andthe1Dmorphologyisplate-likeorlath-like.Theprevioustheoriesandmod-elsofthebainitemorphol....

Abstract: The 3-D morphology of bainite in steels has been studied by SEM with high resolution. Based on the dual-surface observation results, the bainite is divided into three sub-categories:upper,transient and lower bainites. The subplates composing upper bainite sheaf are lath-like while the whole morphology of lower bainite and that of its subplates are plate-shaped. The subunits in lower bainite seem to be lumpish. The 3-D morphology of transient bainite proves to resemble both upper and lower bainites on some aspects. The microStructural evolution of three types of bainite has been discussed.