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Effects of Start and Finish Cooling Temperatures on Microstructure and Mechanical Properties of Low-Carbon High-Strength and Low-Yield Ratio Bainitic Steels

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Abstract

The effects of start and finish cooling temperatures on microstructure and mechanical properties of low-carbon high-strength and low-yield ratio bainitic steels were investigated in this study. Four kinds of low-carbon high-strength and low-yield ratio bainitic steels were fabricated by varying the start and finish cooling temperatures and cooling rates, and their microstructure and mechanical properties such as tensile and Charpy impact properties were measured. In the steels cooled down from the high start cooling temperature above Ar1 [978 K (705 °C)], the volume fraction of acicular ferrite is lower than in the steels cooled down from the low start cooling temperature below Ar1 [978 K (705 °C)]. The finish cooling temperatures and cooling rates affect the formation of bainitic ferrite, granular bainite, and martensite–austenite (MA) constituents. According to the correlation between microstructure and mechanical properties, the tensile strength increases with increasing the volume fractions of bainitic ferrite and MA constituents, whereas the elongation decreases. The yield ratio decreases as the volume fraction of MA constituents increases. Charpy impact absorbed energy is proportional to the volume fraction of acicular ferrite, and is inversely proportional to the volume fraction of granular bainite.

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Acknowledgments

This study was supported by the Ministry of Knowledge Economy under a Grant No. 100400-25.

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Authors and Affiliations

  1. Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, 790-784, Korea

    Hyo Kyung Sung (Research Assistant) & Sunghak Lee (Professor)

  2. School of Materials Science and Engineering, University of Ulsan, Ulsan, 680-749, Korea

    Sang Yong Shin (Assistant Professor)

  3. Materials Science and Engineering, University of Science and Technology, Pohang, Pohang, Korea

    Sunghak Lee (Professor)

Authors
  1. Hyo Kyung Sung
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  2. Sunghak Lee
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  3. Sang Yong Shin
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Correspondence to Sang Yong Shin.

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Manuscript submitted February 5, 2013.

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Sung, H.K., Lee, S. & Shin, S.Y. Effects of Start and Finish Cooling Temperatures on Microstructure and Mechanical Properties of Low-Carbon High-Strength and Low-Yield Ratio Bainitic Steels. Metall Mater Trans A 45, 2004–2013 (2014). https://doi.org/10.1007/s11661-013-2156-2

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