Effect of deformation parameters on the austenite dynamic recrystallization behavior of a eutectoid pearlite rail steel

Haibo Feng; Shaohua Li; Kexiao Wang; Junheng Gao; Shuize Wang; Haitao Zhao; Zhenyu Han; Yong Deng; Yuhe Huang; Xinping Mao

doi:10.1007/s12613-023-2805-4

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Haibo Feng, Shaohua Li, Kexiao Wang, Junheng Gao, Shuize Wang, Haitao Zhao, Zhenyu Han, Yong Deng, Yuhe Huang, and Xinping Mao, Effect of deformation parameters on the austenite dynamic recrystallization behavior of a eutectoid pearlite rail steel, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-023-2805-4

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Haibo Feng, Shaohua Li, Kexiao Wang, Junheng Gao, Shuize Wang, Haitao Zhao, Zhenyu Han, Yong Deng, Yuhe Huang, and Xinping Mao, Effect of deformation parameters on the austenite dynamic recrystallization behavior of a eutectoid pearlite rail steel, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-023-2805-4

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Research Article

Effect of deformation parameters on the austenite dynamic recrystallization behavior of a eutectoid pearlite rail steel

+ Author Affiliations

Corresponding authors:
Junheng Gao    E-mail: Junhenggao@ustb.edu.cn

Shuize Wang    E-mail: wangshuize@ustb.edu.cn

Xinping Mao    E-mail: maoxinping@126.com
Received: 3 August 2023; Revised: 3 December 2023; Accepted: 5 December 2023; Available online: 8 December 2023

Abstract

Abstract

Understandings of the effect of hot deformation parameters close to the practical production line on grain refinement are crucial for enhancing both the strength and toughness of future rail steels. In this work, the austenite dynamic recrystallization (DRX) behaviors of a eutectoid pearlite rail steel were studied using a thermo-mechanical simulator with hot deformation parameters frequently employed in rail production lines. The single-pass hot deformation results reveal that the prior austenite grain sizes (PAGSs) for samples with different deformation reductions decrease initially with an increase in deformation temperature. However, once the deformation temperature is beyond a certain threshold, the PAGSs start to increase. It can be attributed to the rise in DRX volume fraction and the increase of DRX grain with deformation temperature, respectively. Three-pass hot deformation results show that the accumulated strain generated in the first and second deformation passes can increase the extent of DRX. In the case of complete DRX, PAGS is predominantly determined by the deformation temperature of the final pass. It suggests a strategic approach during industrial production where part of the deformation reduction in low temperature range can be shifted to the medium temperature range to release rolling mill loads.
- eutectoid pearlite rail steel;
- prior austenite grain size;
- dynamic recrystallization;
- single-pass hot deformation;
- three-pass hot deformation

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References(35)

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