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Microstructure Evolution of RE Rail Steel During Hot Deformation

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Abstract

Little attention has been paid to the microstructure evolution of rail steel adding rare earth (RE) during hot deformation, so U75V-RE (RE = La, Ce) rail is compared with the traditional U75V rail. Thermal simulation test, mathematical regression analysis, finite element numerical simulation, cellular automata, OM, EBSD, and hardness tester were used to study the dynamic recrystallization evolution of U75V-RE rail and U75V rail at strain rates of 0.01–0.5 s−1 and hot deformation temperatures of 900–1150 °C. The results show that the simulation is quite close to that of the experimental measurements, and the dynamic recrystallization of U75V-RE rail and U75V rail easily occurs with a low strain rate and high temperature. U75V-RE rail has a much higher recrystallization critical strain than U75V rail during hot deformation. The recrystallization percentage and average grain size of U75V-RE rail are lower than those of U75V rail under the same hot deformation conditions, but the hardness of U75V-RE rail is higher. This can be attributed to the RE inhibit the dynamic recrystallization of U75V-RE rail, and RE elements play the main role in grain refinement of U75V-RE rail, which is the key reason for the excellent mechanical properties of U75V-RE rail.

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Acknowledgements

This work was supported by Natural Science Foundation of Inner Mongolia Autonomous Region of China (Grant Nos. 2019LH05016), and Research Program of Science and Technology at Universities of Inner Mongolia Autonomous Region of China (Grant Nos. NJZY20089), and Innovation fund of Inner Mongolia University of Science and Technology (Grant Nos. 2019QDL-B06 and 2019QDL-B07) and Inner Mongolia Science and Technology major special project Foundation (Grant Nos. ZDZX2018024). The authors gratefully acknowledge Science and Technology Innovation Guidance Project of Inner Mongolia Autonomous Region “Research and Application of Key Technology of the third Generation High Strength Heavy Load Wear Resistant Heat Treatment Rail”.

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  1. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou, 014010, China

    Yaodong Cen, Chunjiao Ji, Lin Chen, Kunyu Chen & Dandan Ke

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  1. Yaodong Cen
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  2. Chunjiao Ji
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  3. Lin Chen
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Correspondence to Lin Chen.

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Cen, Y., Ji, C., Chen, L. et al. Microstructure Evolution of RE Rail Steel During Hot Deformation. Metallogr. Microstruct. Anal. 12, 545–556 (2023). https://doi.org/10.1007/s13632-023-00926-6

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