文献类型：期刊文献

英文题名：On the Formation and Growth of Grain Boundary κ-Carbides in Austenitic High-Mn Lightweight Steels

作者：Elkot, Mohamed[1,2]; Sun, Binhan[3]; Zhou, Xuyang[1]; Ponge, Dirk[1]; Raabe, Dierk[1]

机构：[1] Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Stra?e 1, Düsseldorf, 40237, Germany; [2] Department of Metallurgical and Materials Engineering, Suez University, Suez, 43512, Egypt; [3] Key Laboratory of Pressure Systems and Safety, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20230227714)

语种：英文

外文关键词：Aluminum alloys - Austenite - Carbides - Grain growth - Growth kinetics - High resolution transmission electron microscopy - Manganese alloys - Manganese compounds - Manganese steel - Probes - Scanning electron microscopy - Spinodal decomposition

摘要：The precipitation of grain boundary (GB) κ-carbides critically influences the damage-tolerance ability of high-Mn high-Al lightweight steels particularly at harsh environments (cryogenic and H environment). The formation and growth behavior of these carbides thus need to be understood. In this work, we use atom probe tomography and four-dimensional scanning transmission electron microscopy to study the formation mechanisms of GB κ-carbides in a Fe-28Mn-8Al-1.3C (wt.%) steel that is aged at 550°C, a temperature at which GB κ-carbide formation is often believed to be delayed or avoided. We observe that the formation of GB κ-carbides results from spinodal decomposition of grain interior (GI) κ-carbides and their further interaction with GB planes, rather than from heterogeneous GB nucleation as has been formerly proposed. However, the subsequent growth of GB κ-carbides shows different kinetics in comparison to GI κ-carbides. The underlying reason and its implication to future microstructure design of such steels are discussed. ? 2023, The Authors. All rights reserved.