Wear and Shelling Behavior in Pearlitic and Bainitic Rail Steels with Various Tensile Strengths

Yokoyama, Hiroyasu; Mitao, Shinji; Sakai, Jun–ichi; Yamamoto, Sadahiro

doi:10.2355/tetsutohagane1955.86.6_417

Cited by 3 publications

(4 citation statements)

References 5 publications

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“…Rail life is mainly controlled by two types of damage, namely, wear and fatigue. It is known that wear resistance can be improved by hardening the material microstructure, which is achieved by refining the lamellar spacing in pearlite [1][2][3] and/or increasing the cementite (θ) fraction. 4,5) On the other hand, fatigue damage is a very local phenomenon in comparison with wear damage, which makes it difficult to detect in service, but even a local fatigue crack can induce a catastrophic train accident if fatigue damage is mis-detected.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pro-eutectoid Cementite on Fatigue Crack Growth Behavior of Pearlitic Steels

Ando¹,

Ohtsubo²,

Tagawa³

2023

ISIJ Int.

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The influence of pro-eutectoid cementite (θ) on fatigue crack growth behavior was investigated using various pearlitic steels containing from 0.64 to 1.21 mass% C. The fatigue crack growth rates of the hypoeutectoid and eutectoid pearlitic steels hardly changed, while that of the 1.21 mass% C steel having a large amount of pro-eutectoid θ was accelerated, especially in the high stress intensity factor region. Scanning electron microscope (SEM) observation revealed that the fatigue fracture surface of the 1.21 mass% C steel more frequently contained islanded brittle fracture surfaces than that in other steels. In the 1.21 mass% C steel, the total area fraction of brittle fracture surfaces was notably increased with an enhancement in maximum stress intensity factor (K max ) due to crack extension. More detailed SEM fractographies were performed comparing between before and after etching were performed in order to identify microstructures beneath the brittle fracture appearances on the fatigue fracture surface of the 1.21 mass% C steel. As a result, it was suggested that pro-eutectoid θ was involved in the formation of brittle fracture. Based on these investigations, the accelerated fatigue crack growth behavior of hyper-eutectoid steel was discussed in terms of static brittle fracture induced by pro-eutectoid θ near the crack tip.

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Section: Introductionmentioning

confidence: 99%

Effect of Pro-eutectoid Cementite on Fatigue Crack Growth Behavior of Pearlitic Steels

Ando¹,

Ohtsubo²,

Tagawa³

2023

ISIJ Int.

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“…However, the bainitic steels showed complex dependencies on the strength and contact pressures. 18 It is apparent that except for the wear performance of the bainitic steels, these steels offer excellent material properties (strength, ductility and toughness), to be a suitable replacement of the conventional rail steels. Consequently, the improvement of wear resistance of bainitic steels should make it a prospective rail material candidate, which will offer higher damage resistance and longer service life.…”

Section: Introductionmentioning

confidence: 99%

“…9 The bainitic rail steels possessed fracture toughness almost double than that of the pearlitic rail steels. 17,18 The wear resistance of pearlitic steels has a simple correlation with the contact pressure and hardness described by a Holm's-type equation ( W = kP / H , where W , P , H and k are the wear volume, contact pressure, hardness and a constant, respectively). However, the bainitic steels showed complex dependencies on the strength and contact pressures.…”

Section: Introductionmentioning

confidence: 99%

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Wear behaviour of bainitic rail and wheel steels

Sharma

Sangal

Mondal

2016

Materials Science and Technology

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The paper presents a short review on the past research and recent trends in the development of rail and wheel steels using bainitic morphology from the angle of mechanical and wear performances. The enhancement in mechanical properties as well wear resistance of the bainitic rail and wheel steels is very promising. In addition, the mechanical behaviour of a bainitic rail steel and a wheel steel along with their linearly reciprocating dry sliding wear characteristics in comparison to the existing pearlitic rail and ferritic-pearlitic wheel steels used in Indian Railways is discussed. The steels were subjected to austempering heat treatment at different temperatures and durations in the bainitic region as determined from the TTT diagrams of the respective steels. Bainitic steels show better mechanical properties and wear resistance due to the typical morphology of bainitic microstructural.

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Effect of Pro-eutectoid Cementite on Fatigue Crack Growth Behavior of Pearlitic Steels

Ando¹,

Ohtsubo²,

Tagawa³

2022

Tetsu-to-Hagane

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The influence of pro-eutectoid cementite on fatigue crack growth behavior was investigated using various pearlitic steels containing from 0.64 to 1.21 mass%C. The fatigue crack growth rates of the hypo-eutectoid and eutectoid pearlitic steels hardly changed, while that of the 1.21 mass%C steel having a large amount of pro-eutectoid cementite (θ) was accelerated especially in the high stress intensity factor region. Scanning electron microscope (SEM) observation revealed that fatigue fracture surface in the 1.21 mass%C steel more frequently contained islanded brittle fracture surfaces than that in other steels. In the 1.21 mass%C steel, the total area fraction of brittle fracture surface was notably increased with an enhancement in maximum stress intensity factor (K max ) due to crack extension. More detailed SEM fractographies were performed comparing between before and after etching in order to identify microstructures beneath the brittle fracture appearances on the fatigue fracture surface of the 1.21 mass%C steel. As a results, it was suggested that the pro-eutectoid θ was involved in the formation of brittle fracture. Based on these investigations, the accelerated fatigue crack growth behavior of hyper-eutectoid steel was discussed in terms of static brittle fracture induced by pro-eutectoid θ near the crack tip.

show abstract

Wear and Shelling Behavior in Pearlitic and Bainitic Rail Steels with Various Tensile Strengths

Cited by 3 publications

References 5 publications

Effect of Pro-eutectoid Cementite on Fatigue Crack Growth Behavior of Pearlitic Steels

Effect of Pro-eutectoid Cementite on Fatigue Crack Growth Behavior of Pearlitic Steels

Wear behaviour of bainitic rail and wheel steels

Effect of Pro-eutectoid Cementite on Fatigue Crack Growth Behavior of Pearlitic Steels

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