On the formation and growth of grain boundary κ-carbides in austenitic high-Mn lightweight steels

Mohamed N. Elkot; Binhan Sun; Xuyang Zhou; Dirk Ponge; Dierk Raabe

doi:10.1080/21663831.2023.2284321

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On the formation and growth of grain boundary κ-carbides in austenitic high-Mn lightweight steels

Original reports | 更新时间：2026-08-19

- On the formation and growth of grain boundary κ-carbides in austenitic high-Mn lightweight steels
- On the formation and growth of grain boundary κ-carbides in austenitic high-Mn lightweight steels
- 材料研究快报（英文） 2024年12卷第1期页码：10-16
- 作者机构：
  
  1. a Max-Planck-Institut für Eisenforschung GmbH Düsseldorf Germany
  2. b Department of Metallurgical and Materials Engineering Suez University
  3. c Key Laboratory of Pressure Systems and Safety Ministry of Education School of Mechanical and Power Engineering East China University of Science and Technology
  4. a Max-Planck-Institut für Eisenforschung GmbH
- 作者简介：
- 基金信息：
- DOI：10.1080/21663831.2023.2284321
  中图分类号：
- 网络首发：2023-11-27，
  
  纸质出版：2024
- 稿件说明：
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Mohamed N. Elkot, Binhan Sun, Xuyang Zhou, 等. On the formation and growth of grain boundary κ-carbides in austenitic high-Mn lightweight steels[J]. 材料研究快报（英文）, 2024,12(1):10-16.

Mohamed N. Elkot, Binhan Sun, Xuyang Zhou, et al. On the formation and growth of grain boundary κ-carbides in austenitic high-Mn lightweight steels[J]. Materials Research Letters, 2024, 12(1): 10-16.
Mohamed N. Elkot, Binhan Sun, Xuyang Zhou, 等. On the formation and growth of grain boundary κ-carbides in austenitic high-Mn lightweight steels[J]. 材料研究快报（英文）, 2024,12(1):10-16. DOI： 10.1080/21663831.2023.2284321.

Mohamed N. Elkot, Binhan Sun, Xuyang Zhou, et al. On the formation and growth of grain boundary κ-carbides in austenitic high-Mn lightweight steels[J]. Materials Research Letters, 2024, 12(1): 10-16. DOI： 10.1080/21663831.2023.2284321.

摘要

Abstract

The precipitation of grain boundary (GB) κ-carbides critically influences the damage-tolerance ability of high-Mn high-Al lightweight steels

particularly in harsh environments (cryogenic and H environments). 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 implications for future microstructure design of such steels are discussed.

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相关机构

c Department of Materials Design Institute of Hydrogen Technology Helmholtz-Zentrum Hereon GmbH

b State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing

a State Key Laboratory of Powder Metallurgy Central South University

b Beijing Engineering Technology Research Center of Special Steel for Traffic and Energy

a Collaborative Innovation Center of Steel Technology University of Science and Technology Beijing Beijing People’s Republic of China

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