2026-10-14T15:44:23Z https://www.scidb.cn/oai

10.57760/sciencedb.0122h 2026-09-10T14:51:38Z

2026-09-10 Rolling Contact Fatigue Damage Behavior of Different Rail Materials and Operating Parameters in Water Environment doi:10.57760/sciencedb.0122h en  In rainy environments, the water medium that penetrates into rail cracks is an important factor exacerbating rolling contact fatigue. To gain an in-depth understanding of the impact of different rail materials and operating parameters on rolling contact fatigue damage of rails in an aqueous medium, rolling contact fatigue damage tests were conducted using the MJP-30A rolling contact fatigue testing machine. The tests involved 7 types of rails with different materials and U75VH rails under 3 different working conditions in an aqueous medium. The rail hardness, strength, material microstructure, and laws of rolling contact fatigue damage were analyzed, and the mechanism of rail rolling contact fatigue damage in an aqueous medium was clarified. The results show that pearlite lamellar spacing is one of the key factors affecting the mechanical properties (hardness, strength) of rails and their fatigue performance in an aqueous medium environment. For rails of the same type, as the pearlite lamellar spacing decreases, the hardness and strength of the rails increase, while the length and depth of fatigue cracks show a decreasing trend. When comparing different types of rails, the presence of proeutectoid ferrite in the rail structure leads to an increase in the length, depth, and density of fatigue cracks. In an aqueous medium, as the axle load increases, the wear rate and depth of the plastic deformation layer become larger, the length and depth of fatigue cracks decrease, but the crack density increases significantly. With the increase in speed, the plastic deformation, as well as the length, depth, and density of fatigue cracks, all decrease. In an aqueous medium, due to the “oil wedge effect”, cracks will propagate downward along the plastic flow lines. When the cracks break through the plastic deformation layer, they will deflect, forming C-shaped cracks, and in more severe cases, reticular cracks will occur. The research results are of great significance for the selection of rail materials. rail material; material hardness; operating parameters; rolling contact fatigue; pearlite Su Yuming Yin Weifan Zhou Jianhua Xu Wenjing Ding Haohao Wang Wenjian Liu Qiyue PUBLIC https://creativecommons.org/licenses/by-nc-nd/4.0/ dataset http://www.doi.org/10.16078/j.tribology.2025139 Science Data Bank