Mechanistic dissimilarities between environmentally influenced fatigue-crack propagation at near-threshold and higher growth rates in lower strength steels

Suresh, S.; Ritchie, Robert O.

doi:10.1179/msc.1982.16.11.529

Cited by 97 publications

(45 citation statements)

References 19 publications

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“…At relatively low ΔK values (in this article we refer to it as Stage I) the fatigue crack growth rate (FCGR) seems almost unaffected by environment, while at higher ΔK values (Stage II) the FCGR transitions into accelerated regime where the crack grows at higher rate. Such behavior is generally interpreted as a superposition of sustained load stress-corrosion cracking and pure mechanical fatigue [2]. Similar trends are applicable for fatigue crack growth in steels exposed to hydrogen gas [3].…”

Section: Introductionmentioning

confidence: 90%

Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part II: Accelerated regime manifested by quasi-cleavage fracture at relatively high stress intensity range values

et al. 2018

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Abstract. Hydrogen effect on fatigue performance at relatively high values of stress intensity factor range, ΔK, of pure BCC iron has been studied with a combination of various electron microscopy techniques. Hydrogen-assisted fatigue crack growth rate is manifested by a change of fracture features at the fracture surface from ductile transgranular in air to quasi-cleavage in hydrogen gas. Grain reference orientation deviation (GROD) analysis has shown a dramatic suppression of plastic deformation around the crack wake in samples fatigued in hydrogen. These results were verified by preparing site-specific specimens from different fracture features by using Focused Ion Beam (FIB) technique and observing them with Transmission Electron Microscope (TEM). The FIB lamella taken from the sample fatigued in air was decorated with dislocation cell structure indicating high amount of plasticity, while the lamella taken from the quasi-cleavage surface of the sample fatigued in hydrogen revealed a distribution of dislocation tangles which corresponds to smaller plastic strain amplitude involved at the point of fracture. These results show that a combination of critical hydrogen concentration and critical stress during fatigue crack growth at high ΔK values triggers cleavage-like fracture due to reduction of cohesive force between matrix atoms.

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Section: Introductionmentioning

confidence: 90%

Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part II: Accelerated regime manifested by quasi-cleavage fracture at relatively high stress intensity range values

et al. 2018

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“…Influence of cyclic frequency on fatigue-crack propagation in bainitic 2¼Cr-1Mo steel (SA542-3) tested at R = 0.05 in moist air and dry hydrogen, showing two distinct regimes of environmentally influenced crack growth [40].…”

Section: 16mentioning

confidence: 99%

“…Our approach is drawn primarily from the studies of hydrogen-assisted fatigue-crack growth described in refs. [34][35][36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Effects of hydrogen on fatigue-crack propagation in steels

Murakami¹,

Ritchie²

2012

Gaseous Hydrogen Embrittlement of Materials in Energy Technologies

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“…Oxide-induced crack closure was invoked to explain the observation that, at low stress ratios, near-threshold fatigue crack growth rates can be significantly reduced in corrosive environments compared to those in inert environments. It was proposed that the presence of oxide debris on the fracture surface provides a mechanism for enhanced crack closure due to the earlier contact between two mating surfaces [54,64,65]. Oxide-induced crack closure is promoted by several factors including small crack tip opening displacement, highly oxidizing media, and low stress ratio.…”

Section: Crack Closurementioning

confidence: 99%

Quantitative models on corrosion fatigue crack growth rates in metals: Part I. Overview of quantitative crack growth models

Kim

Choe

Shin

1998

Metals and Materials

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Approaches to predict da/dN-AK for environmental situations; including empirical interpolative equations, linear superposition of mechanical fatigue and time-based environmental cracking, and mechanism-based models; are presented. For several material-environment systems, these models were incorporated in fracture mechanics life prediction methods, and successes have been reported in evaluating the corrosion fatigue contribution. Considerable uncertainties are, however, associated with these models. The linear superposition analysis is emphasized; material-environment systems that are severely environment-sensitive should be adequately described by this method. Direct and indirect methods exist to define time-based crack growth rates for use in linear superposition predictions of da/dN. The linear superposition approach is effective, but only for those cases where K~s{x: is high relative to typical flawed component stress intensity levels. Empirical curve-fit models require an extensive environmental crack growth rate data base, which are costly to develop, and are effective for interpolations but not predictions of fatigue crack growth data. Mechanism-based models for broad predictions of cycle-time dependent da/dN versus AK, and other variables such as frequency or hold time, are in an infant state.

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Mechanistic dissimilarities between environmentally influenced fatigue-crack propagation at near-threshold and higher growth rates in lower strength steels

Cited by 97 publications

References 19 publications

Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part II: Accelerated regime manifested by quasi-cleavage fracture at relatively high stress intensity range values

Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part II: Accelerated regime manifested by quasi-cleavage fracture at relatively high stress intensity range values

Effects of hydrogen on fatigue-crack propagation in steels

Quantitative models on corrosion fatigue crack growth rates in metals: Part I. Overview of quantitative crack growth models

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