期刊
TRIBOLOGY INTERNATIONAL
卷 175, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2022.107870
关键词
Microstructure evolution; Surface defect; Rolling contact fatigue; Water medium
资金
- National Key Research and Develop Program [2021YFB3703602]
- National Natural Science Foundation of China
- Autonomous Research Project of State Key Laboratory
- State Scholarship Fund of the China Scholarship Council (CSC) [202007000128]
- Australian Research Council Discovery Early Career Award [DE210100273]
- Australian Government
- Australian Research Council [DE210100273] Funding Source: Australian Research Council
This study investigates the effect of water mediums on the evolution process of Rolling Contact Fatigue (RCF) behavior on defective rails. Results indicate that under water condition, the RCF behavior can be divided into four regions based on relative locations from surface defects, and the crack depths, densities and damage degrees first increase and then decrease with the progress of the tests. The ratio between the remained defect depth and the RCF crack depth determines whether the existence of defect influences the RCF behavior on the rail material.
With existing rail surface defects, third body mediums play an important role in the evolution of Rolling Contact Fatigue (RCF). This study investigates the effect of water mediums on the evolution process of RCF behavior on defective rails. Conical artificial defects were created using an indentation apparatus and wheel-rail rolling contact tests were conducted on a twin-disc test machine. Results indicate that rolling test preparation procedures can affect the development of RCF behavior of the rail material with surface defect under water condition. The morphology from cross-section views under water condition can be divided into four regions due to various RCF behavior evolution based on relative locations from surface defects. However, in all regions, average crack depths, densities and damage degrees increased first and then decreased with the progress of the tests. Damage in areas with and without pre-existing defects under water and dry conditions were compared and discussed. Results also show that the ratio between the remained defect depth and the RCF crack depth would determine whether the existence of defect influence the RCF behavior on the rail material.
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