Observation of Rolling Contact Fatigue Cracks by Laminography Using Ultra-bright Synchrotron Radiation

Shiozawa, Daiki; Makino, Taizo; Neishi, Yutaka; Nakai, Yoshikazu

doi:10.1016/j.mspro.2014.06.030

Cited by 10 publications

(12 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For successive SR‐μCT imaging of the RCF process, specimens must be sufficiently small to allow the transmission of X‐rays. We employed a specimen with a cross‐sectional area of 500 μm × 500 μm 35 ; however, the mechanism of RCF in a thin specimen is different from that in a bulk specimen; that is, the specimen broke without flaking. Therefore, synchrotron radiation computed laminography (SR‐μCL) was employed, which allows the high‐resolution, nondestructive imaging of thin plates and hence successive observations of the RCF process leading to flaking with a specimen 1.0 mm thick, 10 mm wide, and 24 mm long including vertical MnS inclusions 35 .…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, Kanetani and Ushida reported that cracks usually started forming from non-metallic inclusions rather than WBs. 12 The detrimental effect of inclusions in terms of RCF has been discussed, 17,19,20,[24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] and it has been found that the size, shape, orientation, location, composition of inclusions, and interface conditions between inclusions and the surrounding matrix can be considered to be factors affecting the RCF life. The refinement of inclusions contributes to improving the RCF strength.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Inclusion orientation dependent flaking process in rolling contact fatigue observed by laminography using ultrabright synchrotron radiation X‐ray

Nakai

Shiozawa

Kikuchi

et al. 2022

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

The formation and propagation of cracks in rolling contact fatigue were observed by synchrotron radiation computed laminography, and the effect of stringer-type inclusion orientation was examined. For longitudinal inclusions, cracks started forming at their tips. After cracks propagated toward the rolling direction, a longitudinal crack was kinked simultaneously at both its tips, and propagated toward the direction perpendicular to the rolling direction to form lateral cracks. After kinking, horizontal cracks were formed from the deepest point of a lateral crack, leading to flaking. On the other hand, for specimens with lateral inclusions, cracks propagated to the lateral direction without the formation of longitudinal cracks. Since the propagation life of lateral cracks and that of horizontal cracks were unrelated to the inclusion orientation, the rolling contact fatigue life of specimens with longitudinal inclusions was considerably longer than that of specimens with lateral inclusions.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inclusion orientation dependent flaking process in rolling contact fatigue observed by laminography using ultrabright synchrotron radiation X‐ray

Nakai

Shiozawa

Kikuchi

et al. 2022

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…DCT was performed at a bending beam line, BL19B2, of SPring-8. This beam line delivers an X-ray beam with high brightness and high spatial coherence, allowing microtomography to be performed with high spatial resolution in the μm range [12][13][14][15]. The polychromatic synchrotron beam was monochromated to an energy of 37 keV using a Si {111} doublecrystal monochromator.…”

Section: Methodsmentioning

confidence: 99%

Fatigue Damage Evaluation by Diffraction Contrast Tomography Using Ultra-Bright Synchrotron Radiation

Nakai

Shiozawa

Asakawa

et al. 2018

The 18th International Conference on Experimental Mechanics

View full text Add to dashboard Cite

A three-dimensional grain mapping technique for polycrystalline materials, called X-ray diffraction contrast tomography (DCT), was developed at SPring-8, which is the brightest synchrotron radiation facility in Japan. The developed technique was applied to an austenitic stainless steel. The shape and location of grains could be determined by DCT using the apparatus in a beam line of SPring-8. To evaluate the dislocation structure in fatigue, the total misorientation of individual grains was measured by DCT. The average value of the total misorientation over one sample was increased with the number of cycles. In a grain, the change of the total misorientation was largest for the primary slip plane. The maximum change of the total misorientation in fatigue was larger for planes with larger Schmid factor, and the first fatigue crack initiation was occurred in a grain, which had the greatest change of the total misorientation.

show abstract

“…For successive SRCT imaging of the RCF process, samples must be sufficiently small to allow the transmission of X-rays, and the crosssection must be smaller than 500 μm × 500 μm. Our previous study, however, showed that the mechanism of RCF in a small sample is different from that in a bulk sample [9]. In the present study, SRCL is applied, which allows the high-resolution, nondestructive imaging of thin plates.…”

Section: Introductionmentioning

confidence: 93%

“…Stiénon et al [5], [6] calculated the stress field around nonmetallic inclusions in bearing steels in RCF tests using 3D shapes obtained by SRCT, which was conducted at the European Synchrotron Radiation Facility (ESRF). They used SRCT imaging for the observation of samples with flaking damage and RCF cracks [7], [8]. In these studies, samples were cut from normal size RCF specimens so that they included damaged areas, and the 3D imaging of damage before flaking provided useful information about the RCF crack initiation and propagation processes.…”

Section: Introductionmentioning

confidence: 99%

In situ observation of rolling contact fatigue cracks by laminography using ultrabright synchrotron radiation

Nakai¹,

Shiozawa²,

Kikuchi³

et al. 2015

Frattura Ed Integrità Strutturale

Self Cite

View full text Add to dashboard Cite

In rolling contact fatigue (RCF), cracks usually initiate from inclusions beneath the surface and propagate to the contact surface. In the present study, synchrotron radiation computed laminography (SRCL) imaging was performed to observe flaking defects during the RCF of a high-strength steel. Specially fabricated inclusion-rich steel plate specimens were employed in the experiments. For the in situ observation of crack propagation, a compact RCF testing machine was developed, and a 4D analysis scheme was applied to the data obtained by SRCL. RCF tests were carried out near the measurement hatch of the beam line used SRCL to enable the successive observation of crack initiation and growth behaviors. Specimens before and after the occurrence of flaking were observed by SRCL, and flaking defects and cracks under the surface were successfully detected. As a result, details of the crack initiation and flaking process in RCF could be discussed. Shear-type horizontal cracks were found to initiate after the initiation and propagation of tensile-type vertical cracks along inclusions, where the face of the vertical cracks was perpendicular to the rolling direction and rolling surface. Therefore, the formation of vertical cracks is considered to affect shear-type crack formation and flaking, where the shape and length of inclusions also affect the initiation and propagation of vertical cracks.

show abstract

Observation of Rolling Contact Fatigue Cracks by Laminography Using Ultra-bright Synchrotron Radiation

Cited by 10 publications

References 8 publications

Inclusion orientation dependent flaking process in rolling contact fatigue observed by laminography using ultrabright synchrotron radiation X‐ray

Inclusion orientation dependent flaking process in rolling contact fatigue observed by laminography using ultrabright synchrotron radiation X‐ray

Fatigue Damage Evaluation by Diffraction Contrast Tomography Using Ultra-Bright Synchrotron Radiation

In situ observation of rolling contact fatigue cracks by laminography using ultrabright synchrotron radiation

Contact Info

Product

Resources

About