Stress-state dependence of dynamic strain aging: Thermal hardening and blue brittleness

Wen-qi Liu; Jun-he Lian

doi:10.1007/s12613-021-2250-1

Volume 28 Issue 5

May 2021

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Wen-qi Liu and Jun-he Lian, Stress-state dependence of dynamic strain aging: Thermal hardening and blue brittleness, Int. J. Miner. Metall. Mater., 28(2021), No. 5, pp. 854-866. https://doi.org/10.1007/s12613-021-2250-1

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Wen-qi Liu and Jun-he Lian, Stress-state dependence of dynamic strain aging: Thermal hardening and blue brittleness, Int. J. Miner. Metall. Mater., 28(2021), No. 5, pp. 854-866. https://doi.org/10.1007/s12613-021-2250-1

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Research ArticleOpen Access

Stress-state dependence of dynamic strain aging: Thermal hardening and blue brittleness

Wen-qi Liu¹ and
Jun-he Lian^{1, 2,}

+ Author Affiliations

Corresponding author:
Jun-he Lian E-mail: junhe.lian@aalto.fi
Received: 14 October 2020; Revised: 31 December 2020; Accepted: 11 January 2021; Available online: 13 January 2021

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.
- dynamic strain aging effect;
- Portevin–Le Chatelier effect;
- damage mechanism;
- dimple fracture;
- shear fracture;
- dual-phase steel

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