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説明:

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.

権利情報:

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

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

刊行年月日: 2024-05-20

出版者: Elsevier BV

掲載誌:

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

研究助成金:

原稿種別: 著者最終稿 (Accepted manuscript)

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

公開URL: https://doi.org/10.1016/j.scriptamat.2024.116183

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更新時刻: 2024-11-05 16:59:59 +0900

MDRでの公開時刻: 2026-05-20 08:25:13 +0900