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Metallography, Microstructure, and Analysis
Published in: Metallography, Microstructure, and Analysis 3/2023

11-05-2023 | Peer-Reviewed Paper

Microstructure Evolution of RE Rail Steel During Hot Deformation

Authors: Yaodong Cen, Chunjiao Ji, Lin Chen, Kunyu Chen, Dandan Ke

Published in: Metallography, Microstructure, and Analysis | Issue 3/2023

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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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Metadata
Title
Microstructure Evolution of RE Rail Steel During Hot Deformation
Authors
Yaodong Cen
Chunjiao Ji
Lin Chen
Kunyu Chen
Dandan Ke
Publication date
11-05-2023
Publisher
Springer US
Published in
Metallography, Microstructure, and Analysis / Issue 3/2023
Print ISSN: 2192-9262
Electronic ISSN: 2192-9270
DOI
https://doi.org/10.1007/s13632-023-00926-6

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