Fatigue crack tip corrosion processes and oxide induced closure

Ricker, Richard E.; Miller, A. C.; Kujawski, Daniel

doi:10.1016/j.msea.2022.144383

Cited by 7 publications

(16 citation statements)

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“…24 This study carefully reviewed literature on the reactions, intermediate phases, and kinetics for the transition of metal ions into hard phases and took into account recent publications on nanophase fabrication. 24 Here, we will briefly summarize the findings of that study and their impact on OICC. 24 When a bare metallic alloy is exposed to an environment at ambient pressures (gaseous or aqueous), an adsorbed layer of environmental species forms quickly.…”

Section: On Oxide-induced Crack Closurementioning

confidence: 99%

“…24 Here, we will briefly summarize the findings of that study and their impact on OICC. 24 When a bare metallic alloy is exposed to an environment at ambient pressures (gaseous or aqueous), an adsorbed layer of environmental species forms quickly. 45 In non-inert environments, this adsorbed layer will contain oxidizing species that are readily reduced by accepting electrons from active constituents of the alloy to form chemisorbed and reaction product layers.…”

Section: On Oxide-induced Crack Closurementioning

confidence: 99%

“…36 more information on this subject can be found in the literature. 24,[48][49][50][51][52][53][54][55] The Cabrera-Mott model 52 applies to the growth of thin, flaw-free, oxide films, but in both gaseous and aqueous environments, oxide films frequently grow thicker than this model predicts. This is not a failure of the model but the result of a transition to a secondary growth mechanism and the deposition of metal ions on the environment side of the film.…”

Section: On Oxide-induced Crack Closurementioning

confidence: 99%

“…The phases that result in this layer are simple metal oxides that tend to be amorphous and anhydrous. 24 Second, when the film grows thicker (past the Cabrera-Mott limit), the phases in the film shift from grown oxides to deposited or precipitated oxides. These oxy-hydroxide phases contain hydroxyl ions, waters of crystallization, and other environmental species.…”

Section: On Oxide-induced Crack Closurementioning

confidence: 99%

“…In the present article, we discuss our latest analyses [23][24][25] related to PICC, OICC, and RICC and their relevant implications in shielding effects on FCG. We present some insights on these three types of closure and the role of crack tip chemistry on FCG behavior, in particular, at the threshold region.…”

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confidence: 99%

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On 50 years of fatigue crack closure dispute

Kujawski

Ricker

Sadananda

2023

Fatigue Fract Eng Mat Struct

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In this article, we examine the 50 years of observations and interpretations into the subject of fatigue crack closure in lab air and aqueous solutions: disputes and implications. Over this period, several closure concepts have been invoked to explain why the crack propagation threshold ΔKth should reduce with load ratio R. Among these, three types are the most popular and these are closure induced by crack (i) plasticity (PICC), (ii) oxides (OICC), and (iii) roughness (RICC). Therefore, these three and their role in shielding the fatigue crack tip are critically examined. This analysis finds that the reduction in ΔKth with increasing R‐ratio in lab air and aqueous solutions is weakly linked to decreasing crack closure behind the crack tip but strongly related to the access of the environment to the crack tip region and its influence on fatigue damage at and ahead of the crack tip. Supporting evidence for this interpretation comes from the lack of ΔKth dependence on R in a good vacuum (with partial pressure of 10−5 Pa or less). In chemical environments, our viewpoint is supported by a critical analysis of corrosion processes that found that there is insufficient time for most metallic species to form ions, hydrolyze, and transform into hard phases at the crack tip before closure. Therefore, when closure occurs at the crack tip, most of the oxidized metallic species will exist as aquo‐complexes, gel, or colloids that have insufficient shear strength to wedge crack faces during unloading.

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Section: On Oxide-induced Crack Closurementioning

confidence: 99%