Precipitation behavior of Nb in hot-rolled Nb-microalloyed TRIP steel during high-temperature deformation
Hot-rolled TRIP steel with 0.038% Nb was thermomechanically processed on a Gleeble simulation test machine. The microstructural evolution and the precipitation behavior of Nb were analyzed by optical microscopy, scanning electron microscopy, and transmission electron microscopy. The amount of Nb in...
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Science Press
2015-06-01
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| Series: | 工程科学学报 |
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| Online Access: | http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2015.06.005 |
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| author | FENG Qing-xiao LI Long-fei YANG Wang-yue SUN Zu-qing |
| author_facet | FENG Qing-xiao LI Long-fei YANG Wang-yue SUN Zu-qing |
| author_sort | FENG Qing-xiao |
| collection | DOAJ |
| description | Hot-rolled TRIP steel with 0.038% Nb was thermomechanically processed on a Gleeble simulation test machine. The microstructural evolution and the precipitation behavior of Nb were analyzed by optical microscopy, scanning electron microscopy, and transmission electron microscopy. The amount of Nb in solution/precipitation was quantitatively measured by inductively coupled plasma optical emission spectrometry (ICP-OES). After austenization at 1250℃ for 5 rain, about 70% of added Nb is dissolved into austenite. During hot deformation in the austenitic recrystallized region above 1000℃, only 3% of dissolved Nb precipitates, which is too little to retard static recrystallization of austenite, and then the austenite grain size is markedly refined. Before hot deformation in the austenitie non-recrystallized region at 900℃, the fraction of precipitated Nb is up to 9%, which retards static recrystallization of austenite after hot deformation and results in pancaked austenite grains. Hot deformation in the austenitic non-recrystallized region accelerates the γ→α transformation and refines the ferrite grains. After controlled-cooling to 650℃, there are still 48% and 40% of added Nb in solution after thermomechnical processing for reerystallized austenite and deformed austenite, respectively. |
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| issn | 2095-9389 |
| language | zho |
| publishDate | 2015-06-01 |
| publisher | Science Press |
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| series | 工程科学学报 |
| spelling | doaj-art-a8f7e3af985543a788a0fb3cd3f1da002025-08-20T02:16:59ZzhoScience Press工程科学学报2095-93892015-06-0137670671310.13374/j.issn2095-9389.2015.06.005Precipitation behavior of Nb in hot-rolled Nb-microalloyed TRIP steel during high-temperature deformationFENG Qing-xiao0LI Long-fei1YANG Wang-yue2SUN Zu-qing31. The State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;1. The State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China1. The State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;Hot-rolled TRIP steel with 0.038% Nb was thermomechanically processed on a Gleeble simulation test machine. The microstructural evolution and the precipitation behavior of Nb were analyzed by optical microscopy, scanning electron microscopy, and transmission electron microscopy. The amount of Nb in solution/precipitation was quantitatively measured by inductively coupled plasma optical emission spectrometry (ICP-OES). After austenization at 1250℃ for 5 rain, about 70% of added Nb is dissolved into austenite. During hot deformation in the austenitic recrystallized region above 1000℃, only 3% of dissolved Nb precipitates, which is too little to retard static recrystallization of austenite, and then the austenite grain size is markedly refined. Before hot deformation in the austenitie non-recrystallized region at 900℃, the fraction of precipitated Nb is up to 9%, which retards static recrystallization of austenite after hot deformation and results in pancaked austenite grains. Hot deformation in the austenitic non-recrystallized region accelerates the γ→α transformation and refines the ferrite grains. After controlled-cooling to 650℃, there are still 48% and 40% of added Nb in solution after thermomechnical processing for reerystallized austenite and deformed austenite, respectively.http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2015.06.005trip steelhot rollingniobiummicroalloyinghot deformationsolid solutionprecipitationrecrystallization |
| spellingShingle | FENG Qing-xiao LI Long-fei YANG Wang-yue SUN Zu-qing Precipitation behavior of Nb in hot-rolled Nb-microalloyed TRIP steel during high-temperature deformation 工程科学学报 trip steel hot rolling niobium microalloying hot deformation solid solution precipitation recrystallization |
| title | Precipitation behavior of Nb in hot-rolled Nb-microalloyed TRIP steel during high-temperature deformation |
| title_full | Precipitation behavior of Nb in hot-rolled Nb-microalloyed TRIP steel during high-temperature deformation |
| title_fullStr | Precipitation behavior of Nb in hot-rolled Nb-microalloyed TRIP steel during high-temperature deformation |
| title_full_unstemmed | Precipitation behavior of Nb in hot-rolled Nb-microalloyed TRIP steel during high-temperature deformation |
| title_short | Precipitation behavior of Nb in hot-rolled Nb-microalloyed TRIP steel during high-temperature deformation |
| title_sort | precipitation behavior of nb in hot rolled nb microalloyed trip steel during high temperature deformation |
| topic | trip steel hot rolling niobium microalloying hot deformation solid solution precipitation recrystallization |
| url | http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2015.06.005 |
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