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Reconstruction of the Three-dimensional Ferrite–austenite Microstructure and Crystallographic Analysis in the Early Stage of Reverse Phase Transformation in an Fe–Mn–C Alloy

机译:Fe-Mn-C合金逆相变早期的三维铁素体-奥氏体显微组织重建和晶体学分析

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We have investigated the crystallographic orientation relationship between ferrite and austenite and the interfacial planes between them of a low-carbon steel formed by the transformation from ferrite to austenite upon heating. Three-dimensional investigation using EBSD measurement with FIB serial sectioning technique is carried out on samples quenched from an early stage of the reverse transformation. The prior austenite orientation of martensite in the quenched microstructure is determined based on an analysis of the variants in the Kurdjumov–Sachs (K–S) relationship and the three-dimensional ferrite–austenite microstructure is successfully reconstructed. The crystallographic analysis on the three-dimensional microstructure has revealed that the nucleus of reverse-transformed austenite maintains the K–S relationship or close to it with two or three adjacent ferrite grains. The significance for reverse-transformed austenite to select these specific orientation relationships was estimated through a statistical assessment. In addition, the influence of crystallographic relationship between ferrite and austenite to nucleation and growth of reverse transformation is discussed.
机译:我们研究了通过加热从铁素体转变成奥氏体而形成的低碳钢的铁素体与奥氏体之间的晶体取向关系以及它们之间的界面。从EB逆向转换的早期阶段淬灭的样品进行了EBSD测量和FIB连续切片技术的三维研究。根据对Kurdjumov-Sachs(KS)关系的变体的分析,确定了淬火组织中马氏体的先验奥氏体取向,并成功地重建了三维铁素体-奥氏体组织。对三维显微组织的晶体学分析表明,反向转变的奥氏体的核与两个或三个相邻的铁素体晶粒保持了K-S关系或接近K-S关系。通过统计评估,估计了反相奥氏体选择这些特定取向关系的重要性。此外,讨论了铁素体和奥氏体之间的晶体学关系对反相形核和生长的影响。

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