Study of cyclic strain localization and fatigue crack initiation using FIB technique

Man, Jiří; Vystavel, T.; Weidner, Anja; Kuběna, Ivo; Petrenec, Martin; Kruml, Tomáš; Polák, Jaroslav

doi:10.1016/j.ijfatigue.2011.05.002

Cited by 83 publications

(49 citation statements)

References 67 publications

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“…The extrusions formed were thought to be considerably thicker than the intrusions in their tests and crack nucleation was found to be intimately associated with the intrusions (as opposed to the extrusions). Subsequent work by Man et al [14] in 316L steel revealed the development of widespread dislocation wall structures and the formation of thin, parallel bands, in many ways similar to those observed by Pham and Holdsworth [3], which led to the formation of extrusions/intrusions at the free surface with early crack nucleation at the intrusions. The authors comment on the potential difficulty of interpreting dislocation structures which are influenced by artefacts of the FIB machining for TEM lamellar sample preparation, and also the difficulty of differentiating between a surface intrusion and an early stage fatigue crack.…”

Section: Slip Localisation and Persistent Slip Bands (Psbs)supporting

confidence: 55%

“…Ahmed et al [2] investigated the development of PSBs in cyclic tension-compression deformation in singlecrystal copper using ECCI and found that the PSBs, which contained ladder dislocation structures, led to the formation of extrusions and intrusions on the free surface interface with the PSB, and subsequently led to the development of fatigue cracks which propagated down the centre of the PSB (see figure 2(a) for an example). The crack propagation was found not to alter the existing dislocation structure within the PSB; an observation also made by Man et al [14]. More recently and in polycrystals, Pham et al [4] and Pham and Holdsworth [3] have examined the development of PSBs during cyclic loading of 316 stainless steel using TEM (eg as shown in figure 2(b)).…”

Section: Slip Localisation and Persistent Slip Bands (Psbs)mentioning

confidence: 59%

“…Szczepanski et al [5] and Littlewood et al [33] have identified the importance of grain to grain crystallographic orientation combinations (microtexture) in fatigue crack nucleation; similarly, many researchers note the relationship between crack nucleation and twin boundaries (Sangid et al [18]; Man et al [14]). …”

Section: Microtexture and Twinsmentioning

confidence: 99%

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Fatigue crack nucleation: Mechanistic modelling across the length scales

Dunne

2014

Current Opinion in Solid State and Materials Science

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This paper presents an assessment of recent literature on the mechanistic understanding of fatigue crack nucleation and the associated modelling techniques employed. In particular, the important roles of (a) slip localisation and persistent slip band formation, (b) grain boundaries, slip transfer and interfaces, (c) microtexture and twins, and (d) nucleation criteria and microcracks are addressed in the context of the three key modelling techniques of crystal plasticity (CP), discrete dislocation (DD) plasticity and molecular dynamics (MD) where appropriate. In addition, the need for computational fatigue crack nucleation methodologies which incorporate mechanistic understanding is addressed. Key challenges identified include (i) the overall need for multiscale models for fatigue crack nucleation which are continuum-based but mechanistically informed; (ii) full (3D) crystal slip models to capture slip localisation at a DD level; (iii) MD modelling methodologies for slip transfer to inform DD models; and (iv) rigorously validated dislocation structure models at the DD and CP levels.

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Section: Slip Localisation and Persistent Slip Bands (Psbs)supporting

confidence: 55%

Section: Slip Localisation and Persistent Slip Bands (Psbs)mentioning

confidence: 59%

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Fatigue crack nucleation: Mechanistic modelling across the length scales

Dunne

2014

Current Opinion in Solid State and Materials Science

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“…PSBs (Persistent Slip Bands) create a surface roughness composed of intrusion and extrusion (Fig. 16) which are precursors of material damaging [68]. Crystallographic orientation of each grain plays an important role in the process of emerging PSB.…”

Section: Resultsmentioning

confidence: 99%

Using Microscopy to Help with the Understanding of Degradation Mechanisms Observed in Materials of Pressurized Water Reactors

Legras¹,

Volgin²,

Radiguet³

et al. 2017

JMSE-B

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Abstract:Even if temperature, pressure and chemistry of the cooling water are not very high and aggressive, materials used in PWRs (Pressurized Water Reactors) are exposed to different degradation mechanisms. One of the main goals of the research programs in this field is to develop physical model of the mechanisms down to the atomic scale. Such approach needs a clear description and understanding of the degradation mechanisms at the same small scale. This paper illustrates the benefits of different microscopies and of their last improvements up to the promising possibilities of monochromated and aberrations corrected TEM/STEM. A specific focus is placed on four different degradation mechanisms observed in austenitic stainless steel: irradiation ageing, corrosion fatigue, stress corrosion cracking and corrosion.

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“…The point defect production and migration in the specic dislocation structure of PSBs is quantitatively described and predictions concerning the surface relief are presented. Dislocation arrangement of cyclically deformed materials is studied using transmission electron microscopy (TEM) [2,3,13,14] or using electron channeling contrast (ECC) [15,16]. Most studies were performed in copper (675) single crystals [13,14] but recently the interest is concentrated to polycrystalline materials [1719].…”

Section: Introductionmentioning

confidence: 99%

Quantitative Model of the Surface Relief Formation in Cyclic Straining

Polák

Man

2015

Acta Phys. Pol. A

Self Cite

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The cyclic strain localization in crystalline materials subjected to cyclic loading results in specic dislocation arrangement in persistent slip bands consisting of alternating dislocation rich and dislocation poor volumes. In the present model the interaction of mobile dislocations in persistent slip band leading to the formation of point defects during cyclic straining is considered. Point defects are steadily produced and simultaneously annihilated due to localized cyclic straining. The non-equilibrium point defects migrate to the matrix and result in transfer of matter between persistent slip band and the matrix and formation of the internal stresses both in the persistent slip band and in the matrix. Plastic relaxation of internal stresses leads to the formation of the characteristic surface relief in the form of persistent slip markings (extrusions and intrusions). Process of point defect migration is quantitatively described and the form of extrusion and parallel intrusions is predicted under some simplifying assumptions. The predictions of the model are discussed and predicted surface relief is compared with selected observations of surface relief produced by cyclic straining.

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Study of cyclic strain localization and fatigue crack initiation using FIB technique

Cited by 83 publications

References 67 publications

Fatigue crack nucleation: Mechanistic modelling across the length scales

Fatigue crack nucleation: Mechanistic modelling across the length scales

Using Microscopy to Help with the Understanding of Degradation Mechanisms Observed in Materials of Pressurized Water Reactors

Quantitative Model of the Surface Relief Formation in Cyclic Straining

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