The martensitic transition pathway in steel
作者机构：State Key Laboratory of Nonlinear MechanicsInstitute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering ScienceUniversity of Chinese Academy of SciencesBeijing 101408China Max-Planck-Institut für EisenforschungDüsseldorfGermany
出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)
年 卷 期：2023年第134卷第3期
页 面：244-253页
核心收录：
学科分类：08[工学] 0804[工学-仪器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：supported by the NSFC(Nos.51931005,51901235,11790292) the NSFC Basic Science Center Program for“Multi-scale Problems in Nonlinear Mechanics”(No.11988102) the Key Research Program of Frontier Sciences(No.QYZDJSSW-JSC011) the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB22040302),and the CityU grant 9360161.
主 题：BCT twin Martensitic transformation Steels TEM Phase transformation
摘 要：The martensitic transformation(MT)lays the foundation for microstructure and performance tailoring of many engineering materials,especially steels,which are with1.8 billion tons produced per year the most important material class.The atomic-scale migration path is a long-term challenge for MT dur-ing quenching in high-carbon(nitrogen)steels.Here,we provide direct evidence of(11^(-)2)body-centred tetragonal(BCT)twinned martensite in carbon steels by transmission electron microscopy(TEM)investi-gation,and the increase in tetragonality with the C content matches X-ray diffraction(XRD)results.The specific{11^(-)2}_(BCT)twin planes which are related to the elongated c axis provide essential structural details to revisit the migration path of the atoms in MT.Therefore,the face-centred cubic(FCC)to BCT twin to body-centred cubic(BCC)twin transition pathway and its underlying mechanisms are revealed through direct experimental observation and atomistic simulations.Our findings shed new light on the nature of the martensitic transition,thus providing new opportunities for the nanostructural control of metals and alloys.
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