University of Oulu

Shyamal, S., Farahani, M. G., Allam, T., Hamada, A. S., Haase, C., Kömi, J. I., Chakraborti, P. C., & Sahu, P. (2021). Activation of a hybrid twinning mechanism in a Cr-Ni-Si-V-N medium manganese austenitic steel containing precipitates. Scripta Materialia, 192, 83–88.

Activation of a hybrid twinning mechanism in a Cr-Ni-Si-V-N medium manganese austenitic steel containing precipitates

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Author: Shyamal, S.1; Farahani, M. Ghiasabadi2; Allam, T.3,4;
Organizations: 1Department of Physics, Jadavpur University, Kolkata 700 032, India
2Hot Deformation and Thermomechanical Processing Laboratory of High-Performance Engineering Materials, School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran
3Steel Institute (IEHK), RWTH Aachen University, 52056 Aachen, Germany
4Department of Metallurgical and Materials Engineering, Suez University, 43528 Suez, Egypt
5Kerttu Saalsti Institute, University of Oulu, Pajatie 5, Nivala FIN-85500, Finland
6Centre for Advanced Steels Research, Box 4200, University of Oulu, FIN-90014 Oulu, Finland
7Department of Metallurgical and Material Engineering, Jadavpur University, Kolkata 700 032, India
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.9 MB)
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Language: English
Published: Elsevier, 2021
Publish Date: 2023-04-18


Twinning nucleation in a medium Mn austenitic steel containing precipitates is studied at low strain ~ 0.02, using transmission electron microscopy. In the near vicinity of the precipitates, unfaulting dislocation reaction is favored, while twinning is activated farther from the precipitates. Twin nucleation follows a hybrid mechanism, involving creation of stacking faults through classical dislocation dissociation, while those stacking faults subsequently overlapped following a non-classical alternated stacking fault pair mechanism to create a three-layer twin nucleus. The observed twinning behavior is interpreted from an energy barrier variation viewpoint within the matrix.

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Series: Scripta materialia
ISSN: 1359-6462
ISSN-E: 1872-8456
ISSN-L: 1359-6462
Volume: 192
Pages: 83 - 88
DOI: 10.1016/j.scriptamat.2020.10.011
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Copyright information: © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license