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Microstructure Evolution of a Pearlitic Steel during Hot Deformation of Undercooled Austenite and Subsequent Annealing

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Abstract

Microstructure evolution of a pearlitic steel (0.81 mass pct C) during hot compression of undercooled austenite and subsequent annealing was studied by means of field-emission scanning electron microscopy, electron backscattered diffraction (EBSD), and transmission electron microscopy (TEM). The experiments were performed at 923 K, between A 1 and Ar 1, at strain rates of 0.01 to 1 s−1. Compared with the isothermal transformation and the spheroidizing annealing, the transformation of undercooled austenite and the spheroidization of pearlite were accelerated by hot deformation, leading to the formation of the microduplex structures that consisted of ultrafine ferrite grains with average size smaller than 1 μm and spheroidized cementite particles with average size smaller than 0.3 μm during hot deformation and subsequent annealing.

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Notes

  1. The cooling rate is of forced-air cooling and is automatically controlled by computer using the feedback signals of a pair of thermocouples, which is welded on the center of the specimen during deformation.

  2. The average growth rate of pearlite (V) was simply estimated by the change of average size of pearlite colonies (ΔL) in an interval (Δt) before the completion of transformation, V = ΔL/Δt.

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Acknowledgments

The financial support of The National High Technology Research and Development Program of China (Grant No. 50471092) and Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20050008017) is gratefully acknowledged.

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Authors and Affiliations

  1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, P.R. China

    Longfei Li (Assistant Professor) & Zuqing Sun (Professor)

  2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P.R. China

    Wangyue Yang (Professor)

Authors
  1. Longfei Li
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  2. Wangyue Yang
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  3. Zuqing Sun
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Correspondence to Longfei Li.

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Manuscript submitted October 31, 2006.

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Li, L., Yang, W. & Sun, Z. Microstructure Evolution of a Pearlitic Steel during Hot Deformation of Undercooled Austenite and Subsequent Annealing. Metall Mater Trans A 39, 624–635 (2008). https://doi.org/10.1007/s11661-007-9447-4

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