Structure and metallurgical quality of rail steels produced by various manufacturers

Григорович, К. В.; Trushnikova, A. S.; Арсенкин, А. М.; Shibaev, S. S.; Garber, A. K.

doi:10.1134/s0036029506050107

Cited by 15 publications

(2 citation statements)

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“…Additional information can draw from figure 5-a about the non-metallic inclusions that seem to be present along the crack path. This is also reported in several rail research works [13] [14]. The missing link to understanding the exclusive spread of the spalling defect could be the overcharging of the inclusion neighbor in the headhardened rail rather than the standard one.…”

supporting

confidence: 56%

Spalling defect of head-hardened rail in railway turnouts

Messaadi¹,

Steenbergen²,

Shevtsov³

Civil-Comp Conferences

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This paper investigates the spalling degradation process that could be involved in railway turnouts. By considering the network's failed rails, metallographic examinations revealed the development of subsurface micro-cracks attributed mainly to the non-metallic inclusions. Using Murakami & Yanase equations, the critical size of inclusions leading to the subsurface initiation is discussed in the case of a headhardened rail (350HT) and a standard one (R260). Our findings suggest that the available studies, such as the Kitagawa-Takahashi diagram, overestimate this size on the rail's top surface.

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supporting

confidence: 56%

Spalling defect of head-hardened rail in railway turnouts

Messaadi¹,

Steenbergen²,

Shevtsov³

Civil-Comp Conferences

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“…To increase rail service life and prevent catastrophic accidents, railway companies spend millions of dollars annually grinding to remove surface cracks and spalls, caused by rolling contact fatigue. The wear resistance of pearlitic rails is improved through enhancements in steel cleanness, by the development of head-hardened rail, by hardness and carbon content increase, and by refining pearlite spacing 2–4 .…”

Section: Introductionmentioning

confidence: 99%

Improvement of wear resistance in a pearlitic rail steel via quenching and partitioning processing

Masoumi

Echeverri

Tschiptschin

et al. 2019

Sci Rep

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Improvement of wear resistance and mechanical performance of rails used in heavy-haul railway are essential to reduce railroad maintenance costs. A novel heat treatment based on quenching and partitioning (Q&P) processing was proposed to improve the wear resistance of a hypereutectoid pearlitic rail. 50% of austenite was transformed into martensite under an interrupted quenching from full austenitization temperature to 140 °C. A multiphase microstructure resulted from the quenching and partitioning process, consisting of tempered martensite, bainite, retained austenite, and pearlite colonies. The partitioning step was performed in the range of 350–650 °C. Microstructure characteristics were investigated using scanning electron microscopy, microhardness measurements, X-ray and electron backscattered diffraction. Uniaxial tensile and pin-on-disc tests were also performed to evaluate the mechanical properties and wear resistance. The best combination of wear resistance and mechanical performance was obtained in samples partitioned at 450 and 550 °C, which may be applied in the railway industries.

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