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説明:

In general, the stress-strain relationship of materials obtained by standard uniaxial tensile test, which can identify the hardening behavior only up to necking. Beyond necking, the material behavior is usually estimated by extrapolating or numerical modelling based on hardening behavior prior to the uniform elongation. This study investigated the post-necking hardening behavior of a fully martensitic steel by in-situ synchrotron X-ray diffraction during tensile deformation. From the in-situ results, the dislocation density, lattice strain and phase stress were calculated within the necked region and outside the necked region. A near steady-state flow with some hardening was observed within the necked region of a martensitic steel. However, beyond uniform elongation, outside the necked region the dislocation density and phase stress decreased slightly, suggesting stress relaxation. Steady-state flow and dislocation densities at large strains suggest dynamic recovery occurs in the martensitic steel at room temperature.

権利情報:

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

キーワード: Martensitic Steel, in-situ Synchrotron X-ray Diffraction, Necking

刊行年月日: 2024-10-15

出版者: Iron and Steel Institute of Japan

掲載誌:

• ISIJ International (ISSN: 09151559) vol. 64 issue. 12 ISIJINT-2024-093

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.2355/isijinternational.isijint-2024-093

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更新時刻: 2024-11-07 16:30:41 +0900

MDRでの公開時刻: 2024-11-07 16:30:41 +0900