Environmental influence on the near-threshold fatigue crack propagation behaviour of a high-strength steel

Gardin, C.; Petit, J.; Bouchet, B.

doi:10.1016/0142-1123(92)90002-t

Cited by 39 publications

(14 citation statements)

References 19 publications

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“…The presence of intergranular facets on fatigue fracture surfaces formed at low crack growth rates in Ni-Cr-Mo-V and Cr-Mo steels has often been reported as a clear sign of combined temper and hydrogen embrittlement [23,[28][29][30][31]. Islam et al [28] have shown that a preliminary segregation of impurities during the heat treatment is necessary for this phenomenon, but that hydrogen released by a reaction of water vapor with the metal is also necessary and that the latter readily occurs in air at room-temperature and low crack growth rate.…”

Section: Crack Growth 321 Crack Growth Mechanismsmentioning

confidence: 99%

Surface versus internal fatigue crack initiation in steel: Influence of mean stress

Gaur

Doquet

Persent

et al. 2016

International Journal of Fatigue

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International audienceStress-controlled fatigue tests were run at different R ratios (¼ r min =r max) up to at most 3 million cycles on a 2.5%Cr–1%Mo steel (ASTM A182 F22) used in riser tubes connectors for offshore oil drilling. The fatigue lives, as well as the slope of the S–N curves were found to decrease with increasing R and the endurance limit to follow Gerber's parabola. Surface crack initiation without any defect involved, was most often observed for R = À1, À0.5 and 0, while an R ratio of 0.25 triggered crack initiation from either surface or internal pores or chemically inhomogeneous areas, leading, in the latter case, to fish-eye patterns for relatively low numbers of cycles. A further increase in R ratio to 0.5 promoted only defect-initiated surface cracks, while no fatigue fracture was observed within 10 million cycles above R ¼ 0:6. These transitions in crack initiation mode are discussed based on X-ray diffraction analyses of residual stresses, elastic–plastic F.E. computations on a unit cell model containing a pore and some fracture mechanics analyses, with a particular attention to environmental effects

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Section: Crack Growth 321 Crack Growth Mechanismsmentioning

confidence: 99%

Surface versus internal fatigue crack initiation in steel: Influence of mean stress

Gaur

Doquet

Persent

et al. 2016

International Journal of Fatigue

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“…The absorption of the hydrogen ions into the crack tip, through dislocation motion [172] or transport up the hydrostatic stress gradients [173], promotes embrittlement of the crack tip material. These atomic hydrogens migrate to regions of high stress concentration (crack tip).…”

Section: (B) Hydrogen Embrittlementmentioning

confidence: 99%

Fatigue Damage, Crack Growth and Life Prediction

Ellyin

1996

258

278

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“…The behaviour of 30NCD16 steel under constant amplitude loading in vacuum and in ambient air has been extensively analysed elsewhere [2,3], more specifically from the point of view of environmental influence. The main results can be summarized as follows.…”

Section: Constant Amplitude Testsmentioning

confidence: 99%

“…This enhancement has been attributed to the water vapour present in ambient air. A detailed analysis of the role of water vapour, involving two processes, adsorption and hydrogen embrittlement, has been previously developed [2].…”

Section: Constant Amplitude Testsmentioning

confidence: 99%

“…(1) a single block applied under manual control: after the 100 high level cycles, the load is shed back to its baseline value and the crack length Aa is monitored with respect to the number of applied cycles AN; (2) program blocks: these blocks are similar to block B but the number of cycles AN between overload applications varies. The crack advance Aa during a single block is estimated from the total advance after application of several blocks by assuming that crack advance is constant during each block, which has been checked out experimentally.…”

Section: Calibration Testsmentioning

confidence: 99%

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Fatigue Crack Propagation Behaviour Under Variable Amplitude Loading in the Near‐threshold Region of a High‐strength Low‐alloy Steel

Hénaff

Petit

Journet³

1992

Fatigue Fract Eng Mat Struct

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The near-threshold behaviour of a high-strength low-alloy steel used in helicopter rotors under variable amplitude loading is investigated in ambient air and in vacuum. Strong sequence effects occur, in particular a high decrease in crack growth rates after overloads of 40% on maximum load while keeping the amplitude constant. A detailed study of the retardation phenomenon due to the overloads provides an explanation for the different behaviour observed in air and in vacuum and has laid the basis for a method of predicting crack propagation under helicopter loading spectra. NOMENCLATURE ct = parameter used to describe retardation A = maximum on retardation mastercurve (A = (Nr/Nt)max) B = sDecimen thickness A % = strain at rupture da -= crack growth rate d N ( $) a = nominal crack growth rate (without sequence effect) Aa = distance grown from the point of overload application AK = cyclic stress intensity factor AK,, = effective cyclic stress intensity factor AKq = equivalent cyclic stress intensity factor n = parameter used to describe retardation AN = number of cycles between overload application N, = number of delay cycles N, = total number of applied cycles after overload Ro,2 = yield stress R,,, = stress at failure R, = monotonic plastic zone size due to overloads x = fraction of growth within the overload plastic zone (x = Aa/R,) xa = point of maximum retardation W = specimen width

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Environmental influence on the near-threshold fatigue crack propagation behaviour of a high-strength steel

Cited by 39 publications

References 19 publications

Surface versus internal fatigue crack initiation in steel: Influence of mean stress

Surface versus internal fatigue crack initiation in steel: Influence of mean stress

Fatigue Damage, Crack Growth and Life Prediction

Fatigue Crack Propagation Behaviour Under Variable Amplitude Loading in the Near‐threshold Region of a High‐strength Low‐alloy Steel

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