Fatigue Crack Initiation and Propagation Behavior and Fracture Surface of Eutectoid Steels.

Urashima, Chikayuki; Nishida, Shinichi

doi:10.2472/jsms.43.515

Cited by 13 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(1), the fatigue limit of the lamellar pearlite steel are predicted using the grain size ( ≅ 20µm) as area . As the result, the predicted fatigue ratio are 0.34~0.36 which show good agreement with the test result by Urashima et al (1)…”

Section: Fatigue Ratiosupporting

confidence: 89%

See 1 more Smart Citation

Microscopic Deformation Behavior Observation of Lamellar Pearlite during Plastic Deformation

Kashiwagi

Hamada

2008

JMMP

View full text Add to dashboard Cite

The fatigue ratio of lamellar pearlite steel used for railroad rails is lower than the ratio of general steels. The reason for this has not yet been clarified. It is reported that the direction of the lamellar microstructure in the lamellar pearlite steel affects the fatigue characteristics. In order to clarify the microscopic deformation behavior of the lamellar microstructure considered to affect the fatigue characteristics, static tensile tests of the lamellar pearlite steel were conducted. Using the plastic replica technique, the microscopic deformation behavior i.e. the initiation and propagation of microcracks was observed. Based on the experimental results, transgranular cracks and intergranular cracks were observed. The obtained main results are as follows. (1) The transgranular crack originated in the discontinuous area in the lamellar pearlite microstructure. The transgranular crack initiates in a 45 degree direction to the axis of tension. The transgranular crack does not break through the grain boundary. (2) The intergranular crack does not propagate, but opens. (3) The difference in the material characteristics affected by heat treatment is the total strain of the crack initiation.

show abstract

Section: Fatigue Ratiosupporting

confidence: 89%

“…Urashima et al (1) performed a rotating bending fatigue test of railroad rails. Based on their result, the direction of the lamellar microstructure in railroad rail steel, which has a lamellar pearlite microstructure, affected the on fatigue crack initiation.…”

Section: Introductionmentioning

confidence: 99%

Microscopic Deformation Behavior Observation of Lamellar Pearlite during Plastic Deformation

Kashiwagi

Hamada

2008

JMMP

View full text Add to dashboard Cite

show abstract

“…8. It is clear that fatigue crack initiates in the pearlite block along the inter-lamellar, just like smooth specimen [8]. The specimen with different deformation value showed the similar result.…”

Section: Fatigue Crack Initiation and Propagation Behaviormentioning

confidence: 70%

OS11W0081 Optimum deformation value of notched eutectoid steel by roller working

Sun

Nishida

Hattori

et al. 2003

ATEM

Self Cite

View full text Add to dashboard Cite

As one of the effective and low cost surface modification, the authors have been studying and clarified roller working to be able to improve the fatigue properties of bar shape components. In this study, fatigue test is performed to research the influence of roller working on fatigue properties and determine optimum value by roller working using eutectoid steel. Six kinds of specimens (the deformation value are 0, 0.05, 0.1, 0.15, 0.25 and 0.3mm, respectively) are used for this study by keeping the same final shape and dimensions. According to the results of fatigue test, the compressive residual stress generated in the roller working is one of the main factors for the improvement of fatigue strength, and the fatigue limit does not necessarily increase with the increase of deformation values. There exists an optimum value by roller working for improving the fatigue strength. The reasons why the fatigue limits change with the variation in plastic deformation values and why there exists an optimum deformation value are examined by analyzing residual stress, the variation in micro structure and Vickers hardness distribution.

show abstract

“…5(a), thought that this stripe pattern may have been caused by the different plastic deformabilities of the ferrite and θ in the pearlite lamellae when the fatigue crack propagated while cutting across the lamellae. 6,22) Urashima et al 6) investigated the fatigue crack growth behavior in a eutectoid steel with 0.73 mass% C. They reported that a river pattern was intermingled on the conventional fatigue fracture surface when the ΔK value exceeded 40 MPa•m 1/2 , and the steel showed a faster crack growth rate than that of general steel with the same static strength, especially in the high ΔK region. In the hyper-eutectoid Steel HE2 with the highest carbon content, many brittle fracture surfaces were observed, as shown in Fig.…”

Section: Fractographymentioning

confidence: 99%

“…Fatigue life is generally divided into the two periods of crack initiation life and crack growth life. Previous studies 6,7) reported that the fatigue crack initiation life of rail materials was only 1 to 4% of the total fatigue life, which is on the order of 10 5 cycles, suggesting that fatigue crack growth is the dominant process controlling the fatigue property of rail materials.…”

Section: Introductionmentioning

confidence: 97%

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

Ando¹,

Ohtsubo²,

Tagawa³

2023

ISIJ Int.

View full text Add to dashboard Cite

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.

show abstract

Fatigue Crack Initiation and Propagation Behavior and Fracture Surface of Eutectoid Steels.

Cited by 13 publications

References 0 publications

Microscopic Deformation Behavior Observation of Lamellar Pearlite during Plastic Deformation

Microscopic Deformation Behavior Observation of Lamellar Pearlite during Plastic Deformation

OS11W0081 Optimum deformation value of notched eutectoid steel by roller working

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

Contact Info

Product

Resources

About