Hydrogen embrittlement contributions to fatigue crack growth in a structural steel

Cotterill, P.J.; King, J. E.

doi:10.1016/0142-1123(91)90478-h

Cited by 21 publications

(9 citation statements)

References 7 publications

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“…They claimed that the effectiveness of cathodic protection depended on the applied stress range. Cotterill and King reported [24] that for BS4360: 50E steel there is little contribution of hydrogen to fatigue crack growth at values of AK below 20 MPam'" at R=0.1 andf=0.1 Hz; the major enhancement of crack growth by hydrogen was observed at high AK as implied by our data (Fig. 8).…”

Section: Crack Growth Rates In Csm355 and Bs4360 : Sod Steels Comparedsupporting

confidence: 75%

The Effect of Cathodic Protection Potential on Corrosion Fatigue Crack Growth Rate of an Offshore Structural Steel

Brook

Cole

et al. 1996

Fatigue Fract Eng Mat Struct

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Duplicate tests have been performed to determine the effect of cathodic protection potential on corrosion fatigue crack growth rate of a modern offshore structural steel, produced by thermomechanically controlled processes. The experiments were carried out using compact tension specimens exposed to artificial seawater at 10°C and subjected to constant amplitude loading at 0.35 Hz. Reproducible results showed that the merits of cathodic protection potentials are strongly dependent on stress intensity ratio R and stress intensity range AK. It appears that a spcci6c value of cathodic potential may not give comprehensive protection against corrosion fatigue within the spectrum of variable amplitude loading experienced in service. Fractography showed the initiation of secondary cracks on the fracture surface to be associated with the dissolution of calcium sulphide inclusions, regardless of imposed cathodic potential. NOMENCLATURE u = crack length B = specimen thickness CEV = carbon equivalent value du/dN = crack growth rate K, = mean s t m intensity factor AK = stress intensity range AP = load range K-, K,,,,,, = maximum, and minimum, strcss intensity factor R = stress intensity ratio (K,,,,,,/K,) w = tpecimen width Y = compliance function uuu = tensile strength uy = yield strength

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Section: Crack Growth Rates In Csm355 and Bs4360 : Sod Steels Comparedsupporting

confidence: 75%

The Effect of Cathodic Protection Potential on Corrosion Fatigue Crack Growth Rate of an Offshore Structural Steel

Brook

Cole

et al. 1996

Fatigue Fract Eng Mat Struct

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“…Table shows the result of a literature survey regarding the purity of hydrogen gas used for experiments . As described above, oxygen and other specific gas impurities contained in hydrogen gas environment have inhibitory effects on hydrogen‐induced degradation of material strength.…”

Section: Introductionmentioning

confidence: 99%

Inhibitory effect of oxygen on hydrogen‐induced fracture of A333 pipe steel

Komoda

Kubota

Staykov

et al. 2019

Fatigue Fract Eng Mat Struct

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The effect of oxygen contained in hydrogen gas environment as an impurity on hydrogen environment embrittlement (HEE) of A333 pipe steel was studied through the fracture toughness tests in hydrogen gases. The oxygen contents in the hydrogen gases were 100, 10, and 0.1 vppm. A significant reduction in the J‐Δa curve was observed in the hydrogen with 0.1‐vppm oxygen. Under given loading conditions, the embrittling effect of hydrogen was completely inhibited by 100 vppm of oxygen. In the case of the hydrogen with 10‐vppm oxygen, initially the embrittling effect of hydrogen was fully inhibited, and then subsequently appeared. It was confirmed that 1‐vppm oxygen reduced the embrittling effect of hydrogen. The results can be explained by the predictive model of HEE proposed by Somerday et al.

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“…Cotrill and King have also studied HA-FCG in a C-Mn structural steel by flowing hydrogen gas across the specimen surface and using a frequency of 0.1 Hz and stress ratio of 0.1 [ 35 ]. The FCGR at low Δ K (≈22 MPa m 1/2 ) deviated only slightly between specimens tested in air and hydrogen, but at higher Δ K (≈40 MPa m 1/2 ) the rate in hydrogen increased by almost twenty times the rate in air.…”

Section: Ha-fcg Measurements On Pipeline Steelsmentioning

confidence: 99%