Exploring unusual Lüders deformation in ultrafine-grained high-Mn austenitic steel

Ultrafine-grained (UFG) high-Mn austenitic steel exhibited unusual discontinuous yielding on its stress-strain curve, characterized by a yield drop followed by a stress plateau, indicative of Lüders deformation. Utilizing the digital image correlation (DIC) technique, a strain-localized region known...

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Bibliographic Details
Published in:Materials research letters 2024-08, Vol.12 (8), p.571-579
Main Authors: Hwang, Sukyoung, Kato, Hirokazu, Okada, Kazuho, Park, Myeong-heom, Lavakumar, Avala, Gholizadeh, Reza, Adachi, Hiroki, Sato, Masugu, Tsuji, Nobuhiro
Format: Article
Language:English
Subjects:
Annealing
Austenitic stainless steels
Deformation
Deformation mechanisms
Digital imaging
Engineering
Grain size
High-Mn austenitic steel
Luders lines
Lüders deformation
Materials science
Mechanical properties
Propagation
Radiation
Steel
Strain hardening
Stress-strain curves
Tensile tests
TWIP effect
ultrafine grains
Ultrafines
yield point
Yield stress
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Summary:Ultrafine-grained (UFG) high-Mn austenitic steel exhibited unusual discontinuous yielding on its stress-strain curve, characterized by a yield drop followed by a stress plateau, indicative of Lüders deformation. Utilizing the digital image correlation (DIC) technique, a strain-localized region known as a Lüders band was observed to propagate during Lüders deformation. Following microstructural observations using state-of-the-art techniques such as in-situ synchrotron XRD measurement during the tensile test and ex-situ S/TEM and SEM-ECCI, dislocation multiplication, rather than twinning, was theoretically identified as the primary deformation mechanism responsible for the unusual Lüders deformation in UFG high-Mn austenitic steel.
ISSN:2166-3831
2166-3831
DOI:10.1080/21663831.2024.2359611