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Austenite formation during intercritical annealing in C-Mn cold-rolled dual phase steel

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Abstract

Two different kinds of experimental techniques were used to in-situ study the austenite formation during intercritical annealing in C-Mn dual phase steel. The microstructure evolution was observed by confocal laser scanning microscope, and the austenite isothermal and non-isothermal transformation kinetics were studied by dilatometry. The results indicate that banded structure is produced for the reason of composition segregation and the competition between recrystallization and phase transformation. Austenite prefers to nucleate not only at ferrite/ferrite grain boundaries, but also inside the grains of ferrite. Furthermore, the austenitizing process is accomplished mainly via migration of the existing austenite/ferrite interface rather than nucleation of new grains. The incubation process can be divided into two stages which are controlled by carbon and manganese diffusion, respectively. During the incubation process, the nucleation rate of austenite decreases, and austenite growth changes from two-dimensional to one-dimensional. The partitioning coefficient, defined as the ratio of manganese content in the austenite to that in the adjacent ferrite, increases with increasing soaking time.

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Sheng-ci Li  (李声慈), Yong-lin Kang  (康永林) & Guo-ming Zhu  (朱国明)

  2. Technical Research Institute, Shougang Co., Ltd., Beijing, 100043, China

    Shuang Kuang  (邝霜)

Authors
  1. Sheng-ci Li  (李声慈)
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  2. Yong-lin Kang  (康永林)
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  3. Guo-ming Zhu  (朱国明)
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  4. Shuang Kuang  (邝霜)
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Corresponding author

Correspondence to Yong-lin Kang  (康永林).

Additional information

Foundation item: Project(2013AA031601) supported by the National High Technology Research and Development Program of China; Project(2012BAF04B01) supported by the National Science and Technology Pillar Program During the 12th Five-year Plan Period of China

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Li, Sc., Kang, Yl., Zhu, Gm. et al. Austenite formation during intercritical annealing in C-Mn cold-rolled dual phase steel. J. Cent. South Univ. 22, 1203–1211 (2015). https://doi.org/10.1007/s11771-015-2634-3

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  • DOI: https://doi.org/10.1007/s11771-015-2634-3

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