International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2021-05-06 , DOI: 10.1007/s12613-021-2282-6 Yan Ma , Rui Zheng , Ziyuan Gao , Ulrich Krupp , Hai-wen Luo , Wenwen Song , Wolfgang Bleck
Medium-Mn steels have attracted immense attention for automotive applications owing to their outstanding combination of high strength and superior ductility. This steel class is generally characterized by an ultrafine-grained duplex microstructure consisting of ferrite and a large amount of austenite. Such a unique microstructure is processed by intercritical annealing, where austenite reversion occurs in a fine martensitic matrix. In the present study, austenite reversion in a medium-Mn alloy was simulated by the multiphase-field approach using the commercial software MICRESS® coupled with the thermodynamic database TCFE8 and the kinetic database MOBFE2. In particular, a faceted anisotropy model was incorporated to replicate the lamellar morphology of reversed austenite. The simulated microstructural morphology and phase transformation kinetics (indicated by the amount of phase) concurred well with experimental observations by scanning electron microscopy and in situ synchrotron high-energy X-ray diffraction, respectively.
中文翻译:
中锰钢奥氏体回复的多相场模拟
中锰钢由于其高强度和出色的延展性的出色结合而在汽车领域引起了极大的关注。此类钢的特征通常是由铁素体和大量奥氏体组成的超细晶粒双相组织。这样的独特的微观结构通过临界退火进行处理,其中奥氏体还原发生在精细的马氏体基体中。在本研究中,使用商业软件MICRESS®结合热力学数据库TCFE8和动力学数据库MOBFE2,通过多相场方法对中锰合金中的奥氏体回复进行了模拟。特别是,采用了刻面各向异性模型来复制反向奥氏体的层状形态。原位同步加速器高能X射线衍射。