Incompleteness of bainite transformation in quenched and tempered steel under continuous cooling conditions
The austenitic transformation kinetics of quenched and tempered 22CrMnNiMo steel was investigated by dilatometric measurement at different cooling rates of 0.1∼20 K/s. It was found according to the dilatometric curves that the bainite transformation process of super-cooled austenite exhibited incomp...
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| Format: | Article |
| Language: | English |
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Elsevier
2020-07-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S223878542031440X |
| _version_ | 1828860875755225088 |
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| author | F.-C. An S.-X. Zhao X.-K. Xue J.-J. Wang G. Yuan C.-M. Liu |
| author_facet | F.-C. An S.-X. Zhao X.-K. Xue J.-J. Wang G. Yuan C.-M. Liu |
| author_sort | F.-C. An |
| collection | DOAJ |
| description | The austenitic transformation kinetics of quenched and tempered 22CrMnNiMo steel was investigated by dilatometric measurement at different cooling rates of 0.1∼20 K/s. It was found according to the dilatometric curves that the bainite transformation process of super-cooled austenite exhibited incompleteness during continuous cooling. The incomplete characteristics under different cooling rates were analyzed by determining both changes of ferrite fraction and formation rates with decreasing temperature. It indicated that the three-stage transformation during austenite decomposition was gradually transferred to a distinct two-stage process with increasing the cooling rate. On the basis of microstructural observation and transformation kinetic models, it was further demonstrated that the incompleteness of bainite transformation occurring at low cooling rate was mainly ascribed to the formation of displacive-controlled acicular ferrite, while that during intermediate or fast cooling was attributed to martensite transformation. |
| first_indexed | 2024-12-13T02:49:07Z |
| format | Article |
| id | doaj.art-823c682da1b047919a7028dc1b15b343 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-13T02:49:07Z |
| publishDate | 2020-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-823c682da1b047919a7028dc1b15b3432022-12-22T00:02:07ZengElsevierJournal of Materials Research and Technology2238-78542020-07-019489858996Incompleteness of bainite transformation in quenched and tempered steel under continuous cooling conditionsF.-C. An0S.-X. Zhao1X.-K. Xue2J.-J. Wang3G. Yuan4C.-M. Liu5Key Laboratory for Anisotropy and Texture of Materials (MOE), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, PR ChinaCentral Research Institute, BaoShan Iron & Steel Co., Ltd, Shanghai 201999, PR ChinaKey Laboratory for Anisotropy and Texture of Materials (MOE), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, PR ChinaKey Laboratory for Anisotropy and Texture of Materials (MOE), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, PR China; Corresponding authors.The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, PR China; Corresponding authors.Key Laboratory for Anisotropy and Texture of Materials (MOE), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, PR China; Research Center for Metallic Wires, Northeastern University, Shenyang 110819, PR ChinaThe austenitic transformation kinetics of quenched and tempered 22CrMnNiMo steel was investigated by dilatometric measurement at different cooling rates of 0.1∼20 K/s. It was found according to the dilatometric curves that the bainite transformation process of super-cooled austenite exhibited incompleteness during continuous cooling. The incomplete characteristics under different cooling rates were analyzed by determining both changes of ferrite fraction and formation rates with decreasing temperature. It indicated that the three-stage transformation during austenite decomposition was gradually transferred to a distinct two-stage process with increasing the cooling rate. On the basis of microstructural observation and transformation kinetic models, it was further demonstrated that the incompleteness of bainite transformation occurring at low cooling rate was mainly ascribed to the formation of displacive-controlled acicular ferrite, while that during intermediate or fast cooling was attributed to martensite transformation.http://www.sciencedirect.com/science/article/pii/S223878542031440XAustenitic transformation kineticsIncomplete bainite transformationAcicular ferriteMartensite transformation |
| spellingShingle | F.-C. An S.-X. Zhao X.-K. Xue J.-J. Wang G. Yuan C.-M. Liu Incompleteness of bainite transformation in quenched and tempered steel under continuous cooling conditions Journal of Materials Research and Technology Austenitic transformation kinetics Incomplete bainite transformation Acicular ferrite Martensite transformation |
| title | Incompleteness of bainite transformation in quenched and tempered steel under continuous cooling conditions |
| title_full | Incompleteness of bainite transformation in quenched and tempered steel under continuous cooling conditions |
| title_fullStr | Incompleteness of bainite transformation in quenched and tempered steel under continuous cooling conditions |
| title_full_unstemmed | Incompleteness of bainite transformation in quenched and tempered steel under continuous cooling conditions |
| title_short | Incompleteness of bainite transformation in quenched and tempered steel under continuous cooling conditions |
| title_sort | incompleteness of bainite transformation in quenched and tempered steel under continuous cooling conditions |
| topic | Austenitic transformation kinetics Incomplete bainite transformation Acicular ferrite Martensite transformation |
| url | http://www.sciencedirect.com/science/article/pii/S223878542031440X |
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