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The effects of heating/cooling rate on the phase transformations and thermal expansion coefficient of C–Mn as-cast steel at elevated temperatures

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Abstract

Dilatometric studies of C–Mn hypoeutectoid steel with an as-cast structure were carried out to study the effects of the heating or cooling rate, heating and cooling process on phase transformation, and the thermal expansion coefficient. As the heating or cooling rate (Vc) increased, the characteristic temperatures of Ac1, Acp, and Ac3 also rose, while Ar3, Ar1, and Arp fell. In addition, the phase transformation temperature range (Ac3–Ac1) rose, while (Ar3–Arp) fell as the heating or cooling rate increased. At the same time, the maximum thermal expansion coefficients│αT│ between the heating and cooling processes during phase transformation showed significant differences, and the difference (│ΔαT│) in the maximum │αT│ between these processes increased along with the heating or cooling rate, and this is because of the different phase transformation rates, with regard to the change from austenite to ferrite on cooling and ferrite to austenite on heating. During the heating process, the phase transformation rate of ferrite to austenite first decreases and then increases as the temperature rises, and the phase transformation rate of austenite to ferrite first increases and then decreases during the cooling process. The evolution of carbon and substitutional alloying elements (Si and Mn) in austenite during heating and cooling is also analyzed in this work.

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ACKNOWLEDGMENTS

The work was financially supported by the National Natural Science Foundation of China (NSFC, project No. 51374260, No. 61303208) and The Aim for the Top University Project of National Cheng Kung University (project No. D103-23014).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400030, China

    Zhang Jian & Chen Deng-Fu

  2. Department of Materials Science and Engineering & Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan, 701, Taiwan

    Zhang Jian & Hwang Weng-Sing

  3. School of Electronic Information Engineering, Tianjin University, Tianjin, 300072, China

    Zhang Cheng-Qian

  4. School of Metallurgy and Materials Engineering, Chongqing University of Science & Technology, Chongqing, 400030, China

    Han Ming-Rong

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  1. Zhang Jian
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  2. Chen Deng-Fu
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Correspondence to Zhang Jian.

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Jian, Z., Deng-Fu, C., Cheng-Qian, Z. et al. The effects of heating/cooling rate on the phase transformations and thermal expansion coefficient of C–Mn as-cast steel at elevated temperatures. Journal of Materials Research 30, 2081–2089 (2015). https://doi.org/10.1557/jmr.2015.173

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  • DOI: https://doi.org/10.1557/jmr.2015.173

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