Transformation Characteristics and Microstructure of Rail under Low Stress during Continuous Cooling

To obtain a better understanding the thermal stress of a rail, the thermal simulator was used to measure the expansion curves of different stresses loaded during the continuous cooling process of U75V rail. The transformation plasticity model was established. The experimental results show that stres...

Full description

Saved in:
Bibliographic Details
Published inJournal of Wuhan University of Technology. Materials science edition Vol. 36; no. 2; pp. 269 - 279
Main Authors Cen, Yaodong, Chen, Lin, Chang, Guo, Zhao, Leicheng
Format Journal Article
LanguageEnglish
Published Wuhan Wuhan University of Technology 01.04.2021
Springer Nature B.V
Subjects
Axial stress
Chemistry and Materials Science
Cooling
Cooling curves
Cooling rate
Lamellar structure
Materials Science
Metallic Materials
Model accuracy
Pearlite
Plastic deformation
Plastic properties
Residual stress
Strain
Thermal simulation
Thermal simulators
Thermal stress
Transformations
transformation plasticity
microstructure
rail
Online AccessGet full text

Cover

More Information
Summary:To obtain a better understanding the thermal stress of a rail, the thermal simulator was used to measure the expansion curves of different stresses loaded during the continuous cooling process of U75V rail. The transformation plasticity model was established. The experimental results show that stress can accelerate the transformation process of pearlite. While the same cooling rate is accelerated with the increase of stress, the transformation process of pearlite is accelerated, and the proportion of plastic strain transformation in total strain increases. At the same stress, the process of transformation of pearlite decreases with the increase in cooling rate, and the proportion of transformation plastic strain in total strain decreases. When considering the transformation plasticity, the axial residual stress is more consistent with the actual working condition, the accuracy of the transformation plasticity model is higher; during the continuous cooling process, and the loading stress has a significant influence on the structure. When the stress increases, the orientation of the pearlite lamellae becomes disordered, the pearlite lamellae are bent, the lamellae spacing is no longer uniform, and the hardness is improved.
ISSN:1000-2413
1993-0437
DOI:10.1007/s11595-021-2406-x