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Description:

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.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: High-Mn austenitic steel, yield point, Lüders deformation, ultrafine grains, TWIP effect

Date published: 2024-08-02

Publisher: Informa UK Limited

Journal:

• Materials Research Letters (ISSN: 21663831) vol. 12 issue. 8 p. 571-579

Funding:

• Japan Society for the Promotion of Science 20H00306, 22K18888, 23H00234, 23K20037
• Ministry of Education, Culture, Sports, Science and Technology JPMJCR1994

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1080/21663831.2024.2359611

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Updated at: 2024-08-27 16:30:35 +0900

Published on MDR: 2024-08-27 16:30:35 +0900