The rolling wear and damage characteristics of wheel and rail materials under different axle-loads were investigated using a WR-1 wheel/rail rolling wear testing apparatus. The results show that both of the wear rates of wheel and rail materials rise linearly with the increase of axle-load, and the wear rate of rail specimen is larger than wheel. The hardening rates of wheel and rail specimens firstly increase obviously and then keep stable along with the test time. With the increase of axle-load, the depth of plastic deformation layer and the hardness rate of wheel and rail specimens increase. The hardness rate of wheel is larger than rail. The surface damage morphology of wheel specimen is different from rail. For the surface damage morphology of wheel specimen consists of fatigue cracks perpendicular to rolling direction, however, the rail surface damage morphology is dominated by cracks and spalls. The surface damage of the wheel and rail specimens gets increasingly severe along with the in crease of axle-load. Debris, which comes from fatigue cracks fracture of wheel specimen and spalling of rail, is composed of Fe2O3 and martensite. With the increase of axle-load, the size of debris increases, the components and their content, however, have no obvious change.
WEN Z F, JIN X S, LIU X Q Creepages and friction work of wheelset and track with two type profiles in rolling contact[J]. Tribology, 2001, 21 (4): 288- 292.
WANG W J, ZHONG W, LIU Q Y, et al Investigation on rolling wear and fatigue properties of railway rail[J]. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2009, 223 (7): 1033- 1039.
TAN Xiao-ming, ZHANG Dan-feng, CHEN Yue-liang, et al Probabilistic method to predict fatigue life based on crack initiating micro-mechanism of aluminum alloy[J]. Journal of Aeronautical Materials, 2014, 34 (2): 84- 89.