Dynamic Observation of Bainite Transformation in a Fe-C-Mn-Si Superbainite Steel  

作　　者：胡海江 徐光 ZHANG Yulong XUE Zhengliang ZHOU Mingxing 

机构地区：[1]The State Key Laboratory of Refractories and Metallurgy, Hubei Collaborative Innovation Center for Advanced Steels, Wuhan University of Science and Technology [2]State Key Laboratory of Development and Application Technology of Automotive Steels(Baosteel Group)

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2015年第4期818-821,共4页武汉理工大学学报（材料科学英文版）

基　　金：Fund by the National Natural Science Foundation of China(No.51274154);the National High Technology Research and Development Program of China(No.2012AA03A504);the State Key Laboratory of Development and Application Technology of Automotive Steels(Baosteel Group)Project

摘　　要：The dynamic observations of bainitic transformation in a Fe-C-Mn-Si superbainite steel were conducted on a high temperature laser scanning confocal microscope. It is indicated that the mutual intersection of bainite sheaves often occurs during growth of bainite ferrite, resulting in an interlocked bainite microstructure. Moreover, bainite transformation is promoted by higher austenization temperature and the longer and finer bainite platelets are obtained. Further, The average growth rate of bainite after austenization at 1 100 ℃ is calculated as 5.8 μm·s -1. In situ observation investigation makes it possible to identify bainite transformation in real time during isothermal holding.The dynamic observations of bainitic transformation in a Fe-C-Mn-Si superbainite steel were conducted on a high temperature laser scanning confocal microscope. It is indicated that the mutual intersection of bainite sheaves often occurs during growth of bainite ferrite, resulting in an interlocked bainite microstructure. Moreover, bainite transformation is promoted by higher austenization temperature and the longer and finer bainite platelets are obtained. Further, The average growth rate of bainite after austenization at 1 100 ℃ is calculated as 5.8 μm·s -1. In situ observation investigation makes it possible to identify bainite transformation in real time during isothermal holding.

关 键 词：bainite transformation dynamic observation MICROSTRUCTURE growth rate 

分 类 号：TG142.1[一般工业技术—材料科学与工程]