Effect of defect shape on rolling contact fatigue crack initiation and propagation in high strength steel

Makino, Taizo; Neishi, Yutaka; Shiozawa, Daiki; Kikuchi, Shoichi; Okada, S.; Kajiwara, Kentaro; Nakai, Yoshikazu

doi:10.1016/j.ijfatigue.2016.02.015

Cited by 30 publications

(12 citation statements)

References 23 publications

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“…Consequently, the harmonic-structured SUS304L exhibits a lower resistance to fatigue crack growth owing to grain refinement, and the formation of pores is suppressed by MM. In the future, the three-dimensional fatigue crack shape [41][42][43][44][45][46] and the misorientations near the crack initiation site [47][48][49] will be measured for SUS304L with fatigue damage using synchrotron radiation to describe the mechanism of fatigue crack initiation and propagation in greater detail.…”

Section: -7mentioning

confidence: 99%

Evaluation of Fatigue Properties under Four-point Bending and Fatigue Crack Propagation in Austenitic Stainless Steel with a Bimodal Harmonic Structure

Kikuchi

Nakatsuka

Nakai

et al. 2019

Frattura Ed Integrità Strutturale

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Austenitic stainless steel (JIS-SUS304L) with a bimodal harmonic structure, which is defined as a coarse-grained structure surrounded by a network of fine grains, was fabricated using powder metallurgy to improve both the strength and ductility. Four-point bending fatigue tests and Kdecreasing tests were conducted in air at room temperature under a stress ratio R of 0.1 to investigate fatigue crack propagation in SUS304L. The fatigue limit of this harmonic-structured material is higher than that of the material with a homogeneous coarse-grained structure. This is attributable to the formation of fine grains by mechanical milling and to the suppression of pore formation. In contrast, the threshold stress intensity range, Kth, for the harmonicstructured material is lower than that for the homogeneous coarse-grained material, while the crack growth rates, da/dN, are higher at comparable K. These results can be attributed to a reduction in the effective threshold stress intensity range, K eff,th , due to the presence of fine grains in the harmonic structure.

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Section: -7mentioning

confidence: 99%

Evaluation of Fatigue Properties under Four-point Bending and Fatigue Crack Propagation in Austenitic Stainless Steel with a Bimodal Harmonic Structure

Kikuchi

Nakatsuka

Nakai

et al. 2019

Frattura Ed Integrità Strutturale

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“…The effect of shapes of circular hole defects on the rolling contact fatigue (RCF) crack initiation and propagation in high strength steel by RCF test and synchrotron radiation micro-computed tomography (SR micro CT) imaging was clarified in (Makino et al, 2016). The mechanism of RCF crack propagation was discussed by finite element analysis.…”

Section: Damage Mechanics Modelsmentioning

confidence: 99%

Report of Committee III.2: Fatigue and fracture

2015

Ships and Offshore Structures XIX

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“…With the development of technology, structural parts usually suffer a VHCF; thus, studies on this type of damage have drawn much attention in recent years 12–15 . However, the formation mechanism of the FGA in a VHCF is still obscure.…”

Section: Introductionmentioning

confidence: 99%

Structure characterization within the vicinity of the fine granular area by synchrotron radiation nano‐CT

Liu

Hou

et al. 2020

Fatigue Fract Eng Mat Struct

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The three-dimensional (3D) microstructures within the vicinity of the fine granular area (FGA) were investigated with synchrotron radiation nanocomputed tomography (CT). In this investigation, the very high cycle fatigue test of a high-strength steel was carried out with an ultrasonic fatigue testing machine. Then, focused ion beam cutting was used to cut a part near the surface of the FGA. Finally, the 3D structure of the sample was obtained with the nano-CT imaging. The results indicated that the base material was composed of various subgrains that are tens to hundreds nanometres in size. Through analysis of the slices, small granular areas consist of several subgrains. The statistical analysis of the subgrain size indicated that the subgrain size near the surface of the FGA is similar to that far from the surface of the FGA and near the fracture surface except the FGA. It indicated that the refinement has not been found by nano-CT. K E Y W O R D Sfine granular area, nano-CT, structure characterization, very high cycle fatigue

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Effect of defect shape on rolling contact fatigue crack initiation and propagation in high strength steel

Cited by 30 publications

References 23 publications

Evaluation of Fatigue Properties under Four-point Bending and Fatigue Crack Propagation in Austenitic Stainless Steel with a Bimodal Harmonic Structure

Evaluation of Fatigue Properties under Four-point Bending and Fatigue Crack Propagation in Austenitic Stainless Steel with a Bimodal Harmonic Structure

Report of Committee III.2: Fatigue and fracture

Structure characterization within the vicinity of the fine granular area by synchrotron radiation nano‐CT

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