Formation of White Etching Layer on Rail Surface

Tsujie, Masahiro; Mori, Hisashi; Matsuda, Hiroyuki; Sato, Yukio

doi:10.2320/materia.49.455

Cited by 2 publications

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References 4 publications

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“…1) Many systematic studies have been conducted on rail damage, such as residual stress, [2][3][4][5] crack propagation, 6,7) and white etching layer (WEL). [8][9][10][11][12] However, the details of the damage mechanism of rails have not been clarified because of the complex combination of multiple conditions, such as passing tonnage, transit speed, and weather conditions. In addition, actual situations are difficult to reproduce, even if a two-cylinder rolling test is performed, in which test specimens simulating rails and wheels are rotated at a high speed while maintaining contact.…”

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Section: Anomaly Detection In Rails Using Dimensionality Reductionmentioning

confidence: 99%

“…............. (11). Therefore, because S is a real symmetric matrix, the following eigenequations are derived.Suu = λ ................................. (12) Multiplying the above equation by u T from the left, we get ........................ (13)…”

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Anomaly Detection in Rails Using Dimensionality Reduction

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Suppression Effect of Fretting Wear in Railway Axle Journal Bearings by Means of Hard-film Coatings

et al. 2018

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Axle journal bearings composed of an inner ring, a backing ring, etc. are used in railway applications. The bearing often show fretting wear due to slight relative slip between the inner ring and the backing ring. In this work, the authors have investigated the effects of hard films coated on the backing ring on the fretting wear. Rotational tests using full-scale railway axle bearings with backing rings of side faces which are coated with either of three hard films (titanium nitride (TiN), chromium nitride (CrN) and diamond-like carbon (DLC)) were conducted. It was found that the fretting wear with the TiN film is the worst as a result of the decohesion of whole TiN film, and the fretting wear of the backing ring coated with the CrN film is slight, although the film was not able to follow the deformation of the base material. It was also found that the fretting wear of the backing ring coated with the DLC film which is the thinnest and the hardest among the three films is as slight as that of the backing ring coated with the CrN film, though some of the DLC film left. Accordingly, it is supposed that the fretting wear of the backing ring can be suppressed, if the film coating has a lower friction coefficient, higher hardness and higher bonding strength with the base material.

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Formation of White Etching Layer on Rail Surface

Cited by 2 publications

References 4 publications

Anomaly Detection in Rails Using Dimensionality Reduction

Anomaly Detection in Rails Using Dimensionality Reduction

Suppression Effect of Fretting Wear in Railway Axle Journal Bearings by Means of Hard-film Coatings

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