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説明:

Back stress is an internal stress that develops in materials undergoing plastic deformation, arising from dislocation interactions with various microstructural features. It plays a crucial role in explaining the Bauschinger effect, typically seen in materials subjected to strain path changes. While the deformation behaviour of IN718 has been extensively studied, the influence of prestrain on back stress evolution in aged IN718 remains unclear. Tension (prestrain)-compression tests were conducted on IN718 with varying prestrain to reveal the evolution of the back stress. Two approaches were used to quantify back stress: a macroscopic one, where the back stress is estimated as half the difference between the maximum stress during prestrain and the yield stress during subsequent compression. In the second approach, back stress is calculated by measuring the geometrically necessary dislocation (GND) density in the deformed microstructures. Both approaches are shown to be consistent, and an increase in back stress was observed with increasing prestrain. The prestrained samples were characterized utilizing electron backscatter diffraction (EBSD) measurement.

権利情報:

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

キーワード: back stress, bauschinger effect, IN718, Geometrically necessary dislocation, Kernel misorientation angle, Σ3 boundaries

刊行年月日: 2025-12-23

出版者: Elsevier BV

掲載誌:

• Journal of Materials Research and Technology (ISSN: 22387854) vol. 40 p. 1518-1527

研究助成金:

• Japan Society for the Promotion of Science 23H01732

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.jmrt.2025.12.237

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更新時刻: 2026-01-07 10:34:39 +0900

MDRでの公開時刻: 2026-01-07 12:22:00 +0900