Hatfield Memorial Lecture 2007 Railways and materials: synergetic progress

Smith, R.A.

doi:10.1179/174328108x318888

Cited by 5 publications

(4 citation statements)

References 13 publications

(13 reference statements)

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“…1. From the materials commonly used for rail manufacturing, steel 900A correspondes the best to the composition of the rail material [2,2,4]. Comparing to the base material (BM), in the weld metal (WM) the considerably lower content of carbon was detected as well as lower contents of all the alloying elements.…”

Section: Resultsmentioning

confidence: 99%

Analysis of Cracked Rail of the Crane of Type A120

Kasl

2022

KEM

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The aim of the work was to find out the causes of cracking of the A120 crane track rail. Although the track was regularly inspected by defectoscopic techniques, after five years of operation, the rail was broken at the weldment. The elemental composition of the welded joint materials was verified and the mechanical properties were determined. A fractographic description of the fracture surface was performed and the structure of the material was evaluated. Several factors contributed to the formation of crack, the combination of which led to a rail failure. Defects of the welded joint, acting as notches, from which they initiated fatigue cracks, unfavourable microstructure of the weld metal, low toughness of the base material and operating environment and conditions were dominant.

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Section: Resultsmentioning

confidence: 99%

Analysis of Cracked Rail of the Crane of Type A120

Kasl

2022

KEM

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“…In terms of controlling the development of wheel defects, previous studies [5,13] show that the most common and effective strategy is wheel re-profiling. In most cases, wheel defects, if caught in early stages, can be removed or machined out by re-profiling before damage becomes disastrous [19]. However, the existing mileage-based wheel re-profiling may run counter to operator’s expectation by increasing the maintenance cost and reducing the service life of wheelsets.…”

Section: Introductionmentioning

confidence: 99%

Wayside Detection of Wheel Minor Defects in High-Speed Trains by a Bayesian Blind Source Separation Method

Liu

2019

Sensors

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For high-speed trains, out-of-roundness (OOR)/defects on wheel tread with small radius deviation may suffice to give rise to severe damage on both vehicle components and track structure when they run at high speeds. It is thus highly desirable to detect the defects in a timely manner and then conduct wheel re-profiling for the defective wheels. This paper presents a wayside fiber Bragg grating (FBG)-based wheel condition monitoring system which can detect wheel tread defects online during train passage. A defect identification algorithm is developed to identify potential wheel defects with the monitoring data of rail strain response collected by the devised system. In view that minor wheel defects can only generate anomalies with low amplitude compared with the wheel load effect, advanced signal processing methods are needed to extract the defect-sensitive feature from the monitoring data. This paper explores a Bayesian blind source separation (BSS) method to decompose the rail response signal and to obtain the component that contains defect-sensitive features. After that, the potential defects are identified by analyzing anomalies in the time history based on the Chauvenet’s criterion. To verify the proposed defect detection method, a blind test is conducted using a new train equipped with defective wheels. The results show that all the defects are identified and they concur well with offline wheel radius deviation measurement results. Minor defects with a radius deviation of only 0.06 mm are successfully detected.

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“…Wheel-rail contact is a tiny area; roughly 1 cm 2 [1], where a complex tribo-system operates with respect to the mechanical loading, materials and the environment. Generally, this zone joins the wheel steel and rail steel as continuous patch belongings under combined rolling-sliding motion in straight tracks [2]. However, when trains pass over switches and crossings, the wheel-rail contact becomes intermittent holding often under dynamic impact loads due to the track discontinuities at turnouts [3].…”

Section: Introductionmentioning

confidence: 99%

“…This can also lead to the reduction of maintenance costs to the rail industries and also ensure safety. Recent development of some bainitic grades such as low carbon carbide free bainitic steels showed improved mechanical properties and RCF resistance than the conventional pearlite grades [6][8] [1][2][3]. However, these developments still show insufficient wear resistance specially for use in rail crossings applications [6].…”

Section: Introductionmentioning

confidence: 99%

Friction modifiers effects on tribological behaviour of bainitic rail steels

Messaadi

Oomen

Kumar

2019

Tribology International

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Bainitic steels are gaining popularity for application in the railway switches and crossing, thanks to their better rolling contact fatigue (RCF) and wear resistance. The rail degradation caused by RCF and wear could be also reduced by the use of friction modifiers (FM) through their ability to reduce the lateral load during wheel passage. This paper presents the microstructure and the mechanical properties of newly designed bainitic steel grades; B1400+ and Cr-B potential candidates for switches and turnouts railroad industry. It investigates their friction and wear performances using the HOrizontal twin DIsk Machine. The tribological behavior is evaluated under dry and lubricated conditions in combination with three commercial friction modifiers. Results show a better wear resistance of Cr-B steel in case of abrasive mechanism that dominates the dry experiments. This work defines the efficiency of FM as a low and stable friction coefficient concomitant to a low wear rate. It appears that a good tribological performance is untimely linked to the chemical composition of the friction modifier. In case of lubricated contact, cross-sectioning of wear scare confirms the generation of an interfacial layers. These layers have an impact on the wear mechanism and debris detachment susceptibilities of bainitic steels.

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Hatfield Memorial Lecture 2007 Railways and materials: synergetic progress

Cited by 5 publications

References 13 publications

Analysis of Cracked Rail of the Crane of Type A120

Analysis of Cracked Rail of the Crane of Type A120

Wayside Detection of Wheel Minor Defects in High-Speed Trains by a Bayesian Blind Source Separation Method

Friction modifiers effects on tribological behaviour of bainitic rail steels

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