Effect of Undercooling and Austenitic Grain Size on Bainitic Transformation in an Fe–C–Mn–Si Superbainite Steel

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• 作者：Mingxing Zhou ; Guang Xu ; Li Wang…
• 关键词：Bainitic steels ; Phase transformation ; Isothermal temperature ; Nucleation rate ; Dilatometry
• 刊名：Transactions of the Indian Institute of Metals
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：69
• 期：3
• 页码：693-698
• 全文大小：844 KB
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• 作者单位：Mingxing Zhou (1) (2) (3)
  Guang Xu (1) (3)
  Li Wang (2)
  Haijiang Hu (1) (3)
  
  1. The State Key Laboratory of Refractories and Metallurgy, Hubei Collaborative Innovation Center for Advanced Steels, Wuhan University of Science and Technology, Wuhan, 430081, China
  2. State Key Laboratory of Development and Application Technology of Automotive Steels (Baosteel Group), Baoshan, Shanghai, 201900, China
  3. Faculty of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Materials Science, general
  Tribology, Corrosion and Coatings
  
• 出版者：Springer India
• ISSN：0975-1645

文摘

Superbainite steel is a new high strength steel, widely used in mechanical machinery, structure, bridge engineering etc. The effects of transformation and austenization temperatures on bainitic transformation in an Fe–C–Mn–Si superbainite steel were investigated by the combination of high temperature metallography and dilatometry. The experimental results indicate that the overall kinetics of bainite transformation is promoted by higher austenization temperature and lower isothermal transformation temperature. In conclusion, the nucleation of bainite nuclei of the steel under current study is mainly controlled by carbon diffusion, whereas the growth of bainite nuclei is dominated by displacive mechanism. Moreover, isothermal transformation temperature has a far more significant effect on bainitic transformation than austenization temperature.