Farahani Hussein, Zijlstra Gerrit, Mecozzi Maria Giuseppina, Ocelík Václav, De Hosson Jeff Th M, van der Zwaag Sybrand
Novel Aerospace Materials group,Faculty of Aerospace Engineering,Delft University of Technology,2629 HS Delft,The Netherlands.
Department of Applied Physics,Materials Innovation Institute and Zernike Institute for Advanced Materials, University of Groningen,9747 AG Groningen,The Netherlands.
Microsc Microanal. 2019 Jun;25(3):639-655. doi: 10.1017/S143192761900031X. Epub 2019 Apr 12.
In this research, in situ high-temperature electron backscattered diffraction (EBSD) mapping is applied to record and analyze the migration of the α/γ interfaces during cyclic austenite-ferrite phase transformations in a medium manganese steel. The experimental study is supplemented with related 3D phase field (PF) simulations to better understand the 2D EBSD observations in the context of the 3D transformation events taking place below the surface. The in situ EBSD observations and PF simulations show an overall transformation behavior qualitatively similar to that measured in dilatometry. The behavior and kinetics of individual austenite-ferrite interfaces during the transformation is found to have a wide scatter around the average interface behavior deduced on the basis of the dilatometric measurements. The trajectories of selected characteristic interfaces are analyzed in detail and yield insight into the effect of local conditions in the vicinity of interfaces on their motion, as well as the misguiding effects of 2D observations of processes taking place in 3D.
在本研究中，采用原位高温电子背散射衍射（EBSD）映射技术来记录和分析中锰钢在奥氏体 - 铁素体循环相变过程中α/γ界面的迁移情况。通过相关的三维相场（PF）模拟对实验研究进行补充，以便在表面以下发生的三维转变事件的背景下更好地理解二维EBSD观测结果。原位EBSD观测和PF模拟显示出的整体转变行为在定性上与膨胀法测量的结果相似。发现在转变过程中，单个奥氏体 - 铁素体界面的行为和动力学在基于膨胀测量推导的平均界面行为周围存在很大的离散性。详细分析了选定特征界面的轨迹，从而深入了解界面附近局部条件对其运动的影响，以及二维观测对三维过程的误导作用。
