Effects of TRIP and TWIP mechanisms on improved charpy impact energy of thick hot-rolled duplex lightweight steel plates
Charpy V-notch impact testing serves as a fundamental method for assessing the toughness of conventional steels, but its applicability becomes challenging for duplex (δ-ferrite + γ-austenite) lightweight steels due to their complex microstructures and varied deformation mechanisms. In this study, Ch...
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Elsevier
2024-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424026310 |
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| author | Hyung-Jun Cho Yong Hee Jo Junha Yang Sukjin Lee |
| author_facet | Hyung-Jun Cho Yong Hee Jo Junha Yang Sukjin Lee |
| author_sort | Hyung-Jun Cho |
| collection | DOAJ |
| description | Charpy V-notch impact testing serves as a fundamental method for assessing the toughness of conventional steels, but its applicability becomes challenging for duplex (δ-ferrite + γ-austenite) lightweight steels due to their complex microstructures and varied deformation mechanisms. In this study, Charpy absorbed energies of hot-rolled duplex lightweight steel plates, incorporating both transformation-induced plasticity (TRIP) and twinning-induced plasticity (TWIP) mechanisms, were investigated to understand their fracture behavior comprehensively. The microstructural analysis revealed that the D4 (0.4C–15Mn–6Al (wt.%)) steel exhibited lower δ-ferrite volume fraction and superior Charpy absorbed energy than the D2 (0.2C–15Mn–6Al) steel, attributed to its dominance of TWIP mechanism. Conversely, the D2 steel, with many ferrite/austenite interfaces, showed lower strain hardening and absorbed energy. At lower temperatures, both TWIP and TRIP mechanisms operated, but dominant TRIP mechanism along with higher δ-ferrite volume fraction in the D2 steel accelerated crack propagation, further reducing absorbed energy. The superior toughness of the D4 steel, driven by the dominant TWIP mechanism at lower temperature, highlighted its potential for practical utilization of thick hot-rolled lightweight steel plates in automotive, shipbuilding, military, and construction industries. |
| format | Article |
| id | doaj-art-b9f861b6385145c7bed51417eaf35dca |
| institution | OA Journals |
| issn | 2238-7854 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj-art-b9f861b6385145c7bed51417eaf35dca2025-08-20T02:39:08ZengElsevierJournal of Materials Research and Technology2238-78542024-11-01337048706010.1016/j.jmrt.2024.11.103Effects of TRIP and TWIP mechanisms on improved charpy impact energy of thick hot-rolled duplex lightweight steel platesHyung-Jun Cho0Yong Hee Jo1Junha Yang2Sukjin Lee3Center of Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, 37673, Republic of KoreaLightweight Materials Research Division, Korea Institute of Materials Science, Changwon, 51508, Republic of KoreaLightweight Materials Research Division, Korea Institute of Materials Science, Changwon, 51508, Republic of KoreaDivision of Materials Science and Engineering, Hanyang University, Seoul, 04763, Republic of Korea; Research & Development Division, Hyundai-Steel Company, Dangjin, 31719, Republic of Korea; Corresponding author. Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea.Charpy V-notch impact testing serves as a fundamental method for assessing the toughness of conventional steels, but its applicability becomes challenging for duplex (δ-ferrite + γ-austenite) lightweight steels due to their complex microstructures and varied deformation mechanisms. In this study, Charpy absorbed energies of hot-rolled duplex lightweight steel plates, incorporating both transformation-induced plasticity (TRIP) and twinning-induced plasticity (TWIP) mechanisms, were investigated to understand their fracture behavior comprehensively. The microstructural analysis revealed that the D4 (0.4C–15Mn–6Al (wt.%)) steel exhibited lower δ-ferrite volume fraction and superior Charpy absorbed energy than the D2 (0.2C–15Mn–6Al) steel, attributed to its dominance of TWIP mechanism. Conversely, the D2 steel, with many ferrite/austenite interfaces, showed lower strain hardening and absorbed energy. At lower temperatures, both TWIP and TRIP mechanisms operated, but dominant TRIP mechanism along with higher δ-ferrite volume fraction in the D2 steel accelerated crack propagation, further reducing absorbed energy. The superior toughness of the D4 steel, driven by the dominant TWIP mechanism at lower temperature, highlighted its potential for practical utilization of thick hot-rolled lightweight steel plates in automotive, shipbuilding, military, and construction industries.http://www.sciencedirect.com/science/article/pii/S2238785424026310Duplex (δ-ferrite + γ-austenite) lightweight steelInstrumented charpy impact testTransformation-induced plasticity (TRIP)Twinning-induced plasticity (TWIP)Austenite stability |
| spellingShingle | Hyung-Jun Cho Yong Hee Jo Junha Yang Sukjin Lee Effects of TRIP and TWIP mechanisms on improved charpy impact energy of thick hot-rolled duplex lightweight steel plates Journal of Materials Research and Technology Duplex (δ-ferrite + γ-austenite) lightweight steel Instrumented charpy impact test Transformation-induced plasticity (TRIP) Twinning-induced plasticity (TWIP) Austenite stability |
| title | Effects of TRIP and TWIP mechanisms on improved charpy impact energy of thick hot-rolled duplex lightweight steel plates |
| title_full | Effects of TRIP and TWIP mechanisms on improved charpy impact energy of thick hot-rolled duplex lightweight steel plates |
| title_fullStr | Effects of TRIP and TWIP mechanisms on improved charpy impact energy of thick hot-rolled duplex lightweight steel plates |
| title_full_unstemmed | Effects of TRIP and TWIP mechanisms on improved charpy impact energy of thick hot-rolled duplex lightweight steel plates |
| title_short | Effects of TRIP and TWIP mechanisms on improved charpy impact energy of thick hot-rolled duplex lightweight steel plates |
| title_sort | effects of trip and twip mechanisms on improved charpy impact energy of thick hot rolled duplex lightweight steel plates |
| topic | Duplex (δ-ferrite + γ-austenite) lightweight steel Instrumented charpy impact test Transformation-induced plasticity (TRIP) Twinning-induced plasticity (TWIP) Austenite stability |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424026310 |
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