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Stress-state dependence of dynamic strain aging: Thermal hardening and blue brittleness
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12613_2021_Article_2250.pdf
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1.25 MB
Format
Adobe PDF
Checksum (MD5)
cfbfe8ca5f8c3a344906ec1ce3a8b80f
Author(s)
Liu, Wen-qi
Lian, Jun-he
Date Issued
May 2021
Publisher
University of Science and Technology Beijing
Citation
Liu, Wen-qi and Lian, Jun-he. 2021. "Stress-state dependence of dynamic strain aging: Thermal hardening and blue brittleness."
Version
Author's final manuscript
Abstract
Abstract
This study aims to discover the stress-state dependence of the dynamic strain aging (DSA) effect on the deformation and fracture behavior of high-strength dual-phase (DP) steel at different deformation temperatures (25–400°C) and reveal the damage mechanisms under these various configurations. To achieve different stress states, predesigned specimens with different geometric features were used. Scanning electron microscopy was applied to analyze the fracture modes (e.g., dimple or shear mode) and underlying damage mechanism of the investigated material. DSA is present in this DP steel, showing the Portevin-Le Chatelier (PLC) effect with serrated flow behavior, thermal hardening, and blue brittleness phenomena. Results show that the stress state contributes distinctly to the DSA effect in terms of the magnitude of thermal hardening and the pattern of blue brittleness. Either low stress triaxiality or Lode angle parameter promotes DSA-induced blue brittleness. Accordingly, the damage mechanisms also show dependence on the stress states in conjunction with the DSA effect.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1007/s12613-021-2250-1
