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Effect of Alloying Elements on Pearlite Critical Cooling Rate of U75V Rail-steel

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Abstract

The pearlite critical cooling rate (Vc) provides an important reference for formulating the slack quenching parameters of U75V rail. However, Vc is not a fixed value but changes depending on the contents of alloying elements. First, the effect of alloying elements on the Vc of U75V rail steel was studied. In addition, an exponential prediction model based on C, Mn, Si, and V elements was established and verified. Within the requirements of U75V rail-steel, Vc fluctuated in the range 6–9 °C/s upon changing the contents of alloying elements, and the threshold value of cooling rate of quenching was 6 ℃/s. The effect of alloying elements on Vc was Mn > Si > V > C. In production, incorporating the actual content of alloying elements into the model to obtain the predicted Vc and adjusting the cooling rate close to (not exceed) the predicted Vc, can obtain higher performance rails.

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Funding

Foundation of Liaoning Province Education Administration, 2020 FWDF11, Mingxin Gao.

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  1. School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan, 114011, China

    Mingxin Gao, Jian Yang, Yue Zhang & Hua Song

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  1. Mingxin Gao
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  2. Jian Yang
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Correspondence to Hua Song.

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Gao, M., Yang, J., Zhang, Y. et al. Effect of Alloying Elements on Pearlite Critical Cooling Rate of U75V Rail-steel. Trans Indian Inst Met 76, 665–673 (2023). https://doi.org/10.1007/s12666-022-02753-9

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