Improving Strength-Ductility via Short Austenitization in a Low-Carbon Carbide-Free Bainitic Steel
The strength and ductility of low-carbon carbide-free bainitic (CFB) automotive steel are not good enough. In this study, a short austenitization (SA) process in conjunction with isothermal bainitic transformation was adopted to refine the bainitic ferrite lath, thus improving the mechanical propert...
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| Format: | Article |
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MDPI AG
2022-11-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/12/11/1636 |
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| author | Jianhua Li Peng Chen Dapeng Yang Hongshuang Di Hongliang Yi |
| author_facet | Jianhua Li Peng Chen Dapeng Yang Hongshuang Di Hongliang Yi |
| author_sort | Jianhua Li |
| collection | DOAJ |
| description | The strength and ductility of low-carbon carbide-free bainitic (CFB) automotive steel are not good enough. In this study, a short austenitization (SA) process in conjunction with isothermal bainitic transformation was adopted to refine the bainitic ferrite lath, thus improving the mechanical properties of low-carbon CFB steel. The microstructure evolution was traced by dilatometric measurements and microstructure characterization, which revealed the refined microstructure by SA process. Besides, the deformation behaviors of the studied steels were analyzed, indicating that the improved work hardening capability by refined bainitic ferrite lath and more stable austenite were responsible for the better strength-ductility match. The CFB steel treated by SA process exhibits a high tensile strength of ~1180 MPa, and its elongation of 22.6% is comparable with commercial QP980 steel. |
| first_indexed | 2024-03-09T18:24:07Z |
| format | Article |
| id | doaj.art-0baf3366d6ac4e7cb9205f85d96a10fb |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-09T18:24:07Z |
| publishDate | 2022-11-01 |
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| series | Crystals |
| spelling | doaj.art-0baf3366d6ac4e7cb9205f85d96a10fb2023-11-24T08:02:15ZengMDPI AGCrystals2073-43522022-11-011211163610.3390/cryst12111636Improving Strength-Ductility via Short Austenitization in a Low-Carbon Carbide-Free Bainitic SteelJianhua Li0Peng Chen1Dapeng Yang2Hongshuang Di3Hongliang Yi4The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, ChinaDepartment of Materials Physics and Chemistry, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, ChinaThe State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, ChinaThe State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, ChinaThe State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, ChinaThe strength and ductility of low-carbon carbide-free bainitic (CFB) automotive steel are not good enough. In this study, a short austenitization (SA) process in conjunction with isothermal bainitic transformation was adopted to refine the bainitic ferrite lath, thus improving the mechanical properties of low-carbon CFB steel. The microstructure evolution was traced by dilatometric measurements and microstructure characterization, which revealed the refined microstructure by SA process. Besides, the deformation behaviors of the studied steels were analyzed, indicating that the improved work hardening capability by refined bainitic ferrite lath and more stable austenite were responsible for the better strength-ductility match. The CFB steel treated by SA process exhibits a high tensile strength of ~1180 MPa, and its elongation of 22.6% is comparable with commercial QP980 steel.https://www.mdpi.com/2073-4352/12/11/1636carbide-free bainitic steelshort austenitizationbainitic transformationwork hardeningbainitic ferrite |
| spellingShingle | Jianhua Li Peng Chen Dapeng Yang Hongshuang Di Hongliang Yi Improving Strength-Ductility via Short Austenitization in a Low-Carbon Carbide-Free Bainitic Steel Crystals carbide-free bainitic steel short austenitization bainitic transformation work hardening bainitic ferrite |
| title | Improving Strength-Ductility via Short Austenitization in a Low-Carbon Carbide-Free Bainitic Steel |
| title_full | Improving Strength-Ductility via Short Austenitization in a Low-Carbon Carbide-Free Bainitic Steel |
| title_fullStr | Improving Strength-Ductility via Short Austenitization in a Low-Carbon Carbide-Free Bainitic Steel |
| title_full_unstemmed | Improving Strength-Ductility via Short Austenitization in a Low-Carbon Carbide-Free Bainitic Steel |
| title_short | Improving Strength-Ductility via Short Austenitization in a Low-Carbon Carbide-Free Bainitic Steel |
| title_sort | improving strength ductility via short austenitization in a low carbon carbide free bainitic steel |
| topic | carbide-free bainitic steel short austenitization bainitic transformation work hardening bainitic ferrite |
| url | https://www.mdpi.com/2073-4352/12/11/1636 |
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