Effect of cooling temperature on microstructure and mechanical properties of Nb microalloyed hot-rolled rebar
In this study, the Gleeble-3800 thermal simulation tester was used to simulate various cooling temperature processes for two groups of rebar. Then, the microstructure, precipitation, and mechanical properties of the rebars were characterized using SEM (scanning electron microscopy), EBSD (electron b...
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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/S2238785424021276 |
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| author | Yafei Jiang Shangjun Gu Jie Wang Fulong Wei Zeyun Zeng Tianyou Wang Hongfeng Shi Changrong Li Zhiying Li |
| author_facet | Yafei Jiang Shangjun Gu Jie Wang Fulong Wei Zeyun Zeng Tianyou Wang Hongfeng Shi Changrong Li Zhiying Li |
| author_sort | Yafei Jiang |
| collection | DOAJ |
| description | In this study, the Gleeble-3800 thermal simulation tester was used to simulate various cooling temperature processes for two groups of rebar. Then, the microstructure, precipitation, and mechanical properties of the rebars were characterized using SEM (scanning electron microscopy), EBSD (electron backscatter diffraction), HRTEM (high resolution transmission electron microscopy), and MST810 (universal tensile testing machine). The effect of cooling temperature on the microstructure and mechanical properties was systematically investigated. The results showed that reducing the cooling temperature from 750 °C to 600 °C decreased the ferrite grain size in 0.032 wt % Nb rebar to 7.03 ± 1.5 μm, compared to the 0 wt% Nb rebar. In addition, the pearlite lamellar spacing was refined to 0.103 ± 0.5 μm, and the average particle size of elliptical Nb-rich composite carbides was 9 nm. The tensile strength and yield strength reached 795 ± 9 MPa and 638 ± 8 MPa, respectively, with an elongation after fracture of 17.78 ± 1.0 %. The fracture surface exhibited a dimple morphology. |
| format | Article |
| id | doaj-art-7756ffd66a2c4a768ee8af17aab2e9a8 |
| 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-7756ffd66a2c4a768ee8af17aab2e9a82025-08-20T01:57:20ZengElsevierJournal of Materials Research and Technology2238-78542024-11-01331822183410.1016/j.jmrt.2024.09.125Effect of cooling temperature on microstructure and mechanical properties of Nb microalloyed hot-rolled rebarYafei Jiang0Shangjun Gu1Jie Wang2Fulong Wei3Zeyun Zeng4Tianyou Wang5Hongfeng Shi6Changrong Li7Zhiying Li8College of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China; Guizhou Provincial Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang, 550025, ChinaShougang Shuicheng Iron and Steel (Group) Co., Ltd., Liupanshui, 553000, ChinaShougang Shuicheng Iron and Steel (Group) Co., Ltd., Liupanshui, 553000, ChinaShougang Shuicheng Iron and Steel (Group) Co., Ltd., Liupanshui, 553000, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China; Guizhou Provincial Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang, 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China; Guizhou Provincial Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang, 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China; Guizhou Provincial Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang, 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China; Guizhou Provincial Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang, 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China; Guizhou Provincial Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang, 550025, China; Corresponding author. College of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China.In this study, the Gleeble-3800 thermal simulation tester was used to simulate various cooling temperature processes for two groups of rebar. Then, the microstructure, precipitation, and mechanical properties of the rebars were characterized using SEM (scanning electron microscopy), EBSD (electron backscatter diffraction), HRTEM (high resolution transmission electron microscopy), and MST810 (universal tensile testing machine). The effect of cooling temperature on the microstructure and mechanical properties was systematically investigated. The results showed that reducing the cooling temperature from 750 °C to 600 °C decreased the ferrite grain size in 0.032 wt % Nb rebar to 7.03 ± 1.5 μm, compared to the 0 wt% Nb rebar. In addition, the pearlite lamellar spacing was refined to 0.103 ± 0.5 μm, and the average particle size of elliptical Nb-rich composite carbides was 9 nm. The tensile strength and yield strength reached 795 ± 9 MPa and 638 ± 8 MPa, respectively, with an elongation after fracture of 17.78 ± 1.0 %. The fracture surface exhibited a dimple morphology.http://www.sciencedirect.com/science/article/pii/S2238785424021276Nb microalloyed hot-rolled rebarCooling temperatureEBSDComposite carbidesMechanical properties |
| spellingShingle | Yafei Jiang Shangjun Gu Jie Wang Fulong Wei Zeyun Zeng Tianyou Wang Hongfeng Shi Changrong Li Zhiying Li Effect of cooling temperature on microstructure and mechanical properties of Nb microalloyed hot-rolled rebar Journal of Materials Research and Technology Nb microalloyed hot-rolled rebar Cooling temperature EBSD Composite carbides Mechanical properties |
| title | Effect of cooling temperature on microstructure and mechanical properties of Nb microalloyed hot-rolled rebar |
| title_full | Effect of cooling temperature on microstructure and mechanical properties of Nb microalloyed hot-rolled rebar |
| title_fullStr | Effect of cooling temperature on microstructure and mechanical properties of Nb microalloyed hot-rolled rebar |
| title_full_unstemmed | Effect of cooling temperature on microstructure and mechanical properties of Nb microalloyed hot-rolled rebar |
| title_short | Effect of cooling temperature on microstructure and mechanical properties of Nb microalloyed hot-rolled rebar |
| title_sort | effect of cooling temperature on microstructure and mechanical properties of nb microalloyed hot rolled rebar |
| topic | Nb microalloyed hot-rolled rebar Cooling temperature EBSD Composite carbides Mechanical properties |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424021276 |
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