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Mechanism of dynamic strain aging (DSA) effect in high-Mn austenitic steel, and its correlation with the Portevin-Le Chatelier (PLC) bands, was elucidated using in-situ synchrotron XRD measurement and digital image correlation (DIC) method during a tensile test. The average dislocation velocity beyond the front of the PLC band ranged from 10-2 to 10-1 nm/s but reached the order of 100 nm/s within the front of the PLC band. In comparison, carbon diffusivity was significantly lower, allowing carbon to diffuse only from 10-7 to10-9 nm in one second. The findings indicate that dislocations beyond the front of the PLC band were pinned by nearby carbon atoms, while dislocations within the front of the PLC band became de-pinned from the
carbons. Such localized pinning and de-pinning of dislocations occurred sequentially during deformation, appearing as the propagation of PLC bands in macroscopic scale.

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• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: Portevin–Le Chatelier (PLC) band, dynamic strain aging (DSA), digital image correlation (DIC), in-situ synchrotron XRD, Average dislocation velocity

Date published: 2024-05-20

Publisher: Elsevier BV

Journal:

• Scripta Materialia (ISSN: 13596462) vol. 249 116183

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4916

First published URL: https://doi.org/10.1016/j.scriptamat.2024.116183

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Updated at: 2024-11-05 16:59:59 +0900

Published on MDR: 2026-05-20 08:25:13 +0900