Direct quenching and tempering to achieve high strength and toughness of GPa-Grade nano-precipitated steel: The effect of precipitation behavior and variant selectivity
In order to satisfy the application requirements for strength and toughness of hydropower steels for large pumped storage power plants. In this study, based on the synergy of deformation and phase transition, the trade-off between strength and toughness was broken, and the GPa-grade nano-precipitate...
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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/S2238785424021045 |
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| author | Zhongde Pan Enmao Wang Huibin Wu Junping Wu Jun Hong Zhongzhu Liu Aimin Guo Zhen Sun Yansen Hao |
| author_facet | Zhongde Pan Enmao Wang Huibin Wu Junping Wu Jun Hong Zhongzhu Liu Aimin Guo Zhen Sun Yansen Hao |
| author_sort | Zhongde Pan |
| collection | DOAJ |
| description | In order to satisfy the application requirements for strength and toughness of hydropower steels for large pumped storage power plants. In this study, based on the synergy of deformation and phase transition, the trade-off between strength and toughness was broken, and the GPa-grade nano-precipitated steel was prepared by direct quenching and tempering. The effects of Nb–V–Ti composite nano-precipitation behavior and martensite variant selectivity on the strengthening and toughening mechanisms were highlighted. The results show that directly quenched steel has the optimal comprehensive mechanical properties after tempering at 550 °C. Combining the contributions of various strengthening mechanisms, the increase in the yield strength relative to off-line quenching and tempering is mainly attributed to additional dislocation strengthening (∼33 MPa) and precipitation strengthening (∼174 MPa). Direct quenching enhances the homogeneous nucleation of finer mono- and binary precipitates and their stable growth during tempering, while the ternary precipitates do not suffer from elemental inhomogeneities due to lack of re-dissolution. Furthermore, the high-frequency variants of the dominant close-packed plane group tend to form high-angle grain boundaries with different orientations and planar alignments, derived from the refinement of Bain groups induced by the self-plasticity modulation of martensite transition due to the accumulation of deformed geometrically necessary dislocations and finite dislocation slip. |
| format | Article |
| id | doaj-art-c025a8071d2a4247b701e3831e7f024e |
| institution | OA Journals |
| issn | 2238-7854 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-c025a8071d2a4247b701e3831e7f024e2025-08-20T02:35:33ZengElsevierJournal of Materials Research and Technology2238-78542024-11-01331140115410.1016/j.jmrt.2024.09.099Direct quenching and tempering to achieve high strength and toughness of GPa-Grade nano-precipitated steel: The effect of precipitation behavior and variant selectivityZhongde Pan0Enmao Wang1Huibin Wu2Junping Wu3Jun Hong4Zhongzhu Liu5Aimin Guo6Zhen Sun7Yansen Hao8Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, 100083, Beijing, China; Nanjing Iron and Steel Co., Ltd, 210035, Jiangsu, ChinaCollaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, 100083, Beijing, ChinaCollaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, 100083, Beijing, China; Corresponding author.Nanjing Iron and Steel Co., Ltd, 210035, Jiangsu, ChinaNanjing Iron and Steel Co., Ltd, 210035, Jiangsu, ChinaMicroalloying Technology Center, CITIC Metal Co., Ltd, 100004, Beijing, ChinaMicroalloying Technology Center, CITIC Metal Co., Ltd, 100004, Beijing, ChinaShandong Iron and Steel Group Rizhao Co., Ltd, 276805, Rizhao, ChinaShandong Iron and Steel Group Rizhao Co., Ltd, 276805, Rizhao, ChinaIn order to satisfy the application requirements for strength and toughness of hydropower steels for large pumped storage power plants. In this study, based on the synergy of deformation and phase transition, the trade-off between strength and toughness was broken, and the GPa-grade nano-precipitated steel was prepared by direct quenching and tempering. The effects of Nb–V–Ti composite nano-precipitation behavior and martensite variant selectivity on the strengthening and toughening mechanisms were highlighted. The results show that directly quenched steel has the optimal comprehensive mechanical properties after tempering at 550 °C. Combining the contributions of various strengthening mechanisms, the increase in the yield strength relative to off-line quenching and tempering is mainly attributed to additional dislocation strengthening (∼33 MPa) and precipitation strengthening (∼174 MPa). Direct quenching enhances the homogeneous nucleation of finer mono- and binary precipitates and their stable growth during tempering, while the ternary precipitates do not suffer from elemental inhomogeneities due to lack of re-dissolution. Furthermore, the high-frequency variants of the dominant close-packed plane group tend to form high-angle grain boundaries with different orientations and planar alignments, derived from the refinement of Bain groups induced by the self-plasticity modulation of martensite transition due to the accumulation of deformed geometrically necessary dislocations and finite dislocation slip.http://www.sciencedirect.com/science/article/pii/S2238785424021045Direct quenchingNano-precipitationStrengthening mechanismToughening mechanismVariant |
| spellingShingle | Zhongde Pan Enmao Wang Huibin Wu Junping Wu Jun Hong Zhongzhu Liu Aimin Guo Zhen Sun Yansen Hao Direct quenching and tempering to achieve high strength and toughness of GPa-Grade nano-precipitated steel: The effect of precipitation behavior and variant selectivity Journal of Materials Research and Technology Direct quenching Nano-precipitation Strengthening mechanism Toughening mechanism Variant |
| title | Direct quenching and tempering to achieve high strength and toughness of GPa-Grade nano-precipitated steel: The effect of precipitation behavior and variant selectivity |
| title_full | Direct quenching and tempering to achieve high strength and toughness of GPa-Grade nano-precipitated steel: The effect of precipitation behavior and variant selectivity |
| title_fullStr | Direct quenching and tempering to achieve high strength and toughness of GPa-Grade nano-precipitated steel: The effect of precipitation behavior and variant selectivity |
| title_full_unstemmed | Direct quenching and tempering to achieve high strength and toughness of GPa-Grade nano-precipitated steel: The effect of precipitation behavior and variant selectivity |
| title_short | Direct quenching and tempering to achieve high strength and toughness of GPa-Grade nano-precipitated steel: The effect of precipitation behavior and variant selectivity |
| title_sort | direct quenching and tempering to achieve high strength and toughness of gpa grade nano precipitated steel the effect of precipitation behavior and variant selectivity |
| topic | Direct quenching Nano-precipitation Strengthening mechanism Toughening mechanism Variant |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424021045 |
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