Influence of Rare Earths on Contact Fatigue of Rail Steels
来源期刊：JOURNAL OF RARE EARTHS2000年第2期
论文作者：ZHU Gui-lan MA Teng
Key words：rare earths; rail steel; contact fatigue; plastic deformation; work hardening;
Abstract: Rail/wheel contact fatigue of NbRE rail, Nb rail and U74 rail was investigated using contact fatigue tester. Microstructure and morphology as well as microhardness in the fatigue profiles were analyzed by scanning electron microscope and Vickers hardness respectively. The experimental results show that rare earths are able to delay the initiation and the propagation of fatigue cracks and postpone the surface shelling or spalling, even more, to reduce the crack propagation angle and the crack propagation depth in steady state as well as the plastic deformation area, and to improve work-hardening of the rail steel.
ZHU Gui-lan1，MA Teng1
(1.Department of Physics, Central Iron and Steel Research Institute, Beijing 100081, China)
Abstract:Rail/wheel contact fatigue of NbRE rail, Nb rail and U74 rail was investigated using contact fatigue tester. Microstructure and morphology as well as microhardness in the fatigue profiles were analyzed by scanning electron microscope and Vickers hardness respectively. The experimental results show that rare earths are able to delay the initiation and the propagation of fatigue cracks and postpone the surface shelling or spalling, even more, to reduce the crack propagation angle and the crack propagation depth in steady state as well as the plastic deformation area, and to improve work-hardening of the rail steel.
Key words:rare earths; rail steel; contact fatigue; plastic deformation; work hardening;
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