Infuluence of Ferrite Grain Size on Initiation and Propagation of Fatigue Slip Bands and Cracks : Part 1, Infuluence of Ferrite Grain Size on ε&lt;SUB&gt;0&lt;/SUB&gt;

紀之, 吉川; 芳彦, 萩原; 武, 国尾

doi:10.1299/kikai1938.36.9

Cited by 3 publications

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“…the linear elastic fracture mechanics (LEFM) regime. It is therefore important that the effect of grain size on crack initiation and short crack growth be studied in plain specimens since, in this situation, LEFM conditions probably do not apply [2].…”

Section: Introductionmentioning

confidence: 99%

“…There have been a number of studies regarding the effect of grain size on the fatigue strength of a low-carbon steel. From the results of these studies, it has been established that the fatigue limit of a plain specimen increases as grain size becomes smaller [2][3][4][5][6][7], that the S-N curve exhibits increased fatigue resistance as grain size becomes smaller [8], that the crack growth rate has some dependency on grain size [9] and that the fatigue limit of specimens with a very sharp notch has little dependency on grain size [24]. Taira et al also reported on the dependency of grain size for the limited stress range over which slip bands initiated and a fatigue crack initiated [6].…”

Section: Introductionmentioning

confidence: 99%

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Fatigue Crack Initiation and Propagation in a Low‐carbon Steel of Two Different Grain Sizes

Kage

Miller

Smith

1992

Fatigue Fract Eng Mat Struct

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Rotary bending fatigue tests were carried out using both plain and notched specimens of a low-carbon steel with two different grain sizes (1 5 and 50 pm). The process of early crack development was observed by the replication method. The effect of grain size on crack development was studied.The main conclusions were as follows. (I) Fatigue resistance, in terms of the relative positions of the S-N curves, increases with decreasing grain size. This phenomenon is related to the number of cycles to propagate a crack to failure and the condition for the non-propagation of a fatigue crack. (2) The size of a non-propagating crack, which initiates below the fatigue limit, tends to become larger as grain size increases.(3) The difference in fatigue behaviour between small (15pm) and large (50pm) grain sized specimens is due both to a decrease in crack propagation rate and a smaller non-propagating crack limit in the finer grained material.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fatigue Crack Initiation and Propagation in a Low‐carbon Steel of Two Different Grain Sizes

Kage

Miller

Smith

1992

Fatigue Fract Eng Mat Struct

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Fatigue Crack Initiation Behavior in Ultrafine-Grained Steel Observed by AFM and EBSP

Kimura

Akiniwa

Tanaka

et al. 2004

JSME Int. J., Ser. A

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Ultrafine-grained specimens with the average grain size of less than 2 µm and mediumgrained specimens were prepared from steel plates produced by an advanced thermomechanical control process. The smooth specimens were fatigued under axial tension compression at room temperature in air. The fatigue crack initiation process was investigated by orientation imaging microscopy based on EBSP in combination with atomic force microscopy and scanning electron microscopy. The results show that fatigue cracks initiated in the simple slip lines in the medium-grained specimens. On the other hand, in the ultrafinegrained specimens, complex slip deformation was formed in the vicinity of the grain boundaries prior to the fatigue crack initiation. Fatigue cracks were nucleated at the boundary between the grains with the concentrated complex slip deformation. The crystallographic orientation analysis revealed that the complex slip deformation was formed by the cross slip of active slip systems with the largest Schmid factors. It was found that the relation between the fatigue limit and grain size of the ultrafine-grained specimens does not conform to the Hall-Petch relation of conventional ferritic-pearlitic steel due to the texture and cross slip.

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Rotating Bending Fatigue Property of SCM435 during Electrochemical Hydrogen Charging

Kawakami

Kubota

Matsunaga

2020

J. Japan Inst. Metals and Materials

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The method of rotating bending fatigue test under an electrochemical hydrogen charging was established, by which the fatigue tests were carried out for a JIS SCM435 to study the effect of hydrogen on fatigue strength. The fatigue life of the specimen was degraded by hydrogen charging in relatively low fatigue life regime, where the slope of S N curve for the hydrogen charged specimens was equivalent to that for no charged specimens. The fatigue strength on 50 failure probability at 10 7 cycles under the hydrogen charging was slightly lower than that under the hydrogen free condition. On the surface of the non charged specimen that was run out at 10 7 cycles, a number of cracks up to ≈ 100 µm in length was observed. By contrast, in the hydrogen charged specimen, no crack was observed after the fatigue testing. These results suggested that the hydrogen charging had a negative in uence on the fatigue limit as well as fatigue life of the alloy used in this study.

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Infuluence of Ferrite Grain Size on Initiation and Propagation of Fatigue Slip Bands and Cracks : Part 1, Infuluence of Ferrite Grain Size on ε<SUB>0</SUB>

Cited by 3 publications

References 0 publications

Fatigue Crack Initiation and Propagation in a Low‐carbon Steel of Two Different Grain Sizes

Fatigue Crack Initiation and Propagation in a Low‐carbon Steel of Two Different Grain Sizes

Fatigue Crack Initiation Behavior in Ultrafine-Grained Steel Observed by AFM and EBSP

Rotating Bending Fatigue Property of SCM435 during Electrochemical Hydrogen Charging

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