动态应变时效的应力状态依赖性:热硬化和蓝脆 |
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| 作者姓名： | Wen-qi Liu Jun-he Lian |
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| 作者单位： | Advanced Manufacturing and Materials, Department of Mechanical Engineering, Aalto University, Puumiehenkuja 3, 02150 Espoo, Finland;Advanced Manufacturing and Materials, Department of Mechanical Engineering, Aalto University, Puumiehenkuja 3, 02150 Espoo, Finland;Impact and Crashworthiness Lab, Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139-4307, USA |
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| 基金项目： | The authors gratefully acknowledge the valuable comments by Prof.Sebastian Münstermann from Steel Institute(IEHK),RWTH Aachen University,Germany.The work has been supported by the European Commission Research Fund for Coal and Steel(No.709711).Wenqi Liu is grateful to Shujing Li and Guangming Zeng from IEHK for data processing. |
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| 摘 要： | 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.
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| 关 键 词： | ,,,,,,,,, |
Stress-state dependence of dynamic strain aging: Thermal hardening and blue brittleness |
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| Wen-qi Liu,Jun-he Lian.Stress-state dependence of dynamic strain aging: Thermal hardening and blue brittleness[J].International Journal of Minerals,Metallurgy and Materials,2021,28(5):854-866. |
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| Authors: | Wen-qi Liu Jun-he Lian |
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| Abstract: | This study aims to discover the stress-state dependence of the dynamic strain aging (DSA) effect on the deformation and fracture be-havior 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 elec-tron 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. Ac-cordingly, the damage mechanisms also show dependence on the stress states in conjunction with the DSA effect. |
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| Keywords: | dynamic strain aging effect Portevin–Le Chatelier effect damage mechanism dimple fracture shear fracture dual-phase steel |
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