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In situ observations of austenite grain growth in Fe-C-Mn-Si super bainitic steel

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Abstract

In situ observations of austenite grain growth in Fe-C-Mn-Si super bainitic steel were conducted on a high-temperature laser scanning confocal microscope during continuous heating and subsequent isothermal holding at 850, 1000, and 1100°C for 30 min. A grain growth model was proposed based on experimental results. It is indicated that the austenite grain size increases with austenitizing temperature and holding time. When the austenitizing temperature is above 1100°C, the austenite grains grow rapidly, and abnormal austenite grains occur. In addition, the effect of heating rate on austenite grain growth was investigated, and the relation between austenite grains and bainite morphology after bainitic transformations was also discussed.

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Authors and Affiliations

  1. The Key Laboratory of the Ministry of Education of China for Ferrous Metallurgy and Resources Utilization, Wuhan University of Science and Technology, Wuhan, 430081, China

    Feng Liu, Guang Xu, Hai-jiang Hu & Zheng-liang Xue

  2. State Key Laboratory of Development and Application Technology of Automotive Steels (Baosteel Group), Shanghai, 201900, China

    Yu-long Zhang

  3. Daye Special Steel Co. Ltd., Hubei Xinyegang Steel Co. Ltd., Huangshi, 435001, China

    Lin-xin Zhou

Authors
  1. Feng Liu
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  2. Guang Xu
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  3. Yu-long Zhang
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  4. Hai-jiang Hu
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  5. Lin-xin Zhou
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  6. Zheng-liang Xue
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Correspondence to Guang Xu.

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Liu, F., Xu, G., Zhang, Yl. et al. In situ observations of austenite grain growth in Fe-C-Mn-Si super bainitic steel. Int J Miner Metall Mater 20, 1060–1066 (2013). https://doi.org/10.1007/s12613-013-0834-0

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  • DOI: https://doi.org/10.1007/s12613-013-0834-0

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