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Effect of pre-quenching on martensite-bainitic microstructure and mechanical properties of GCr15 bearing steel

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Abstract

In order to improve the strength and toughness of steel GCr15 (52100), the effect of different amounts of pre-transformed martensite on the kinetics of isothermal bainitic transformation and the strength and toughness of martensite-bainitic (MB) duplex microstructure has been studied by using pre-quenching after conventional 850°C heating to different temperatures (220, 200, 180°C) below M s and then isothermal treatment at 240°C. The experimental results show that the accelerating effect of pre-quenched martensite on isothermal bainitic transformation principally depends upon the pre-quenching temperature (the amount of pre-quenched martensite). The MB duplex microstructure with 33% pre-transformed martensite has the optimum combination of strength and toughness.

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Authors and Affiliations

  1. Department of Metals and Technology, Harbin Institute of Technology, 150006, Harbin, People’s Republic of China

    C. Li

  2. Mechanical Engineering Department, Anhui Institute of Electromechanical Technology, 241000, Wuhu, People’s Republic of China

    J. L. Wang

Authors
  1. C. Li
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  2. J. L. Wang
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Li, C., Wang, J.L. Effect of pre-quenching on martensite-bainitic microstructure and mechanical properties of GCr15 bearing steel. Journal of Materials Science 28, 2112–2118 (1993). https://doi.org/10.1007/BF00367570

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  • DOI: https://doi.org/10.1007/BF00367570

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