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Research on nucleation mechanism of the nanoscale bainite ferrite in a high carbon steel Fe–0.88C–1.35Si–1.03Cr–0.43Mn

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Abstract

X-ray diffraction analysis, transmission electron microscopy, and thermodynamic calculation were used to investigate the effect of microstructural condition of austenite on the microstructural characteristics of the nanoscale bainite ferrite in a high carbon steel. As austenization temperature increases to 950 °C, there are a higher vacancy concentration and homogenized distribution level of the interstitial carbon atom in the austenite grains. The movement of more di-vacancies combination could encourage the generation of the γ → α embryo nucleus. The interstitial carbon atoms have a stronger inhibitory effect on the formation of the γ → α embryo nucleus and homogenized distribution of the interstitial carbon atoms are able to make the inhibitory effect exist everywhere in the austenite grains. In consequence, the bainite ferrite could only nucleate in a smaller area (several nanometers), and grow into slender laths in a smaller width and a larger length.

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ACKNOWLEDGMENT

The study was supported by Tianjin Momentous Technology Supporting Program Foundation of China (No. 11ZCKFGX20500).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Tianjin University of Technology, 300383, Tianjin, China

    Qingsuo Liu, Yue Shen, Qiaoqiao Wu, Bin Gao & Xin Zhang

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  1. Qingsuo Liu
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  2. Yue Shen
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  3. Qiaoqiao Wu
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  5. Xin Zhang
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Correspondence to Qingsuo Liu.

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Liu, Q., Shen, Y., Wu, Q. et al. Research on nucleation mechanism of the nanoscale bainite ferrite in a high carbon steel Fe–0.88C–1.35Si–1.03Cr–0.43Mn. Journal of Materials Research 31, 1510–1517 (2016). https://doi.org/10.1557/jmr.2016.160

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