Grain orientation effects on the growth of short fatigue cracks in austenitic stainless steel

Blochwítz, C.; Jacob, Stefan; Tirschler, W.

doi:10.1016/j.msea.2008.04.050

Cited by 38 publications

(20 citation statements)

References 19 publications

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“…Studies of fatigue of polycrystalline alloys at grain level indicated that crack nucleation and subsequent transgranular growth tend to follow the slip planes due to the shear deformation associated with the slip systems [e.g., 27,30,35,53]. Along the same line, here it was proposed that crack growth in the grain interior will follow the direction of slip trace with the maximum accumulated slip, which can be computed from the crack-tip deformation analyses.…”

Section: Prediction Of Crack Growth Pathmentioning

confidence: 88%

“…However, experimental evidence regarding the connection between crack growth path and slip planes (e.g., {111}, {100}, {110}) in f.c.c. materials has been well documented [27,53,56,57]. In this work, crack growth trajectories were explored based on the consideration of the maximum amount of accumulated shear deformation on the available slip planes.…”

Section: Crack-tip Deformationmentioning

confidence: 99%

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A crystal plasticity study of cyclic constitutive behaviour, crack-tip deformation and crack-growth path for a polycrystalline nickel-based superalloy

Lin

Tong

2011

Engineering Fracture Mechanics

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Crystal plasticity has been applied to model the cyclic constitutive behaviour of a polycrystalline nickel-based superalloy at elevated temperature using finite element analyses.A representative volume element, consisting of randomly oriented grains, was considered for the finite element analyses under periodic boundary constraints. Strain-controlled cyclic test data at 650°C were used to determine the model parameters from a fitting process, where three loading rates were considered. Model simulations are in good agreement with the experimental results for stress-strain loops, cyclic hardening behaviour and stress relaxation behaviour. Stress and strain distributions within the representative volume element are of heterogeneous nature due to the orientation mismatch between neighboring grains. Stress concentrations tend to occur within "hard" grains while strain concentrations tend to locate within "soft" grains, depending on the orientation of grains with respect to the loading direction. The model was further applied to study the near-tip deformation of a transgranular crack in a compact tension specimen using a submodelling technique. Grain microstructure is shown to have an influence on the von Mises stress distribution near the crack tip, and the gain texture heterogeneity disturbs the well-known butterfly shape obtained from the viscoplasticity analysis at continuum level. The stress-strain response near the crack tip, as well as the accumulated shear deformation along slip system, is influenced by the orientation of the grain at the crack tip, which might dictate the subsequent crack growth through grains.Individual slip systems near the crack tip tend to have different amounts of accumulated shear deformation, which was utilised as a criterion to predict the crack growth path.

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Section: Prediction Of Crack Growth Pathmentioning

confidence: 88%

Section: Crack-tip Deformationmentioning

confidence: 99%

A crystal plasticity study of cyclic constitutive behaviour, crack-tip deformation and crack-growth path for a polycrystalline nickel-based superalloy

Lin

Tong

2011

Engineering Fracture Mechanics

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“…The effect of elastic anisotropy was studied in much more detail by Gopalan & Margolin [64], Neumann & Tönnessen [72], Heinz & Neumann [73] and more recently by Lewis et al [74] in a super-austenitic stainless steel (Fe-24Ni-20Cr-6.3Mo-0.22N) and by Miao et al [75,76]) in a Ni base superalloy. This anisotropy effect might explain the effect of texture on fatigue crack initiation in stainless steels as observed by Blochwitz et al [77][78][79].…”

Section: Fatigue Cracks and Grain Boundaries (A) Introductory Commentsmentioning

confidence: 69%

Crossing grain boundaries in metals by slip bands, cleavage and fatigue cracks

Pineau

2015

Phil. Trans. R. Soc. A.

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The size and the character (low and large angle, special boundaries, tilt and twist boundaries, twins) of the grain boundaries (GBs) in polycrystalline materials influence their strength and their fracture toughness. Recent studies devoted to nanocrystalline (NC) materials have shown a deviation from the Hall-Petch law. Special GBs formed by Σ3 twins in face-centred cubic metals are also known to have a strong effect on the mechanical behaviour of these metals, in particular their work-hardening rate. Grain orientation influences also crack path, the fracture toughness of body-centred cubic (BCC) metals and the fatigue crack growth rate of microstructurally short cracks. This paper deals both with slip transfer at GBs and with the interactions between propagating cracks with GBs. In the analysis of slip transfer, the emphasis is placed on twin boundaries (TBs) for which the dislocation reactions during slip transfer are analysed theoretically, experimentally and using the results of atomic molecular simulations published in the literature. It is shown that in a number of situations this transfer leads to a normal motion of the TB owing to the displacement of partial dislocations along the TB. This motion can generate a de-twinning effect observed in particular in NC metals. Crack propagation across GBs is also considered. It is shown that cleavage crack path behaviour in BCC metals is largely dependent on the twist component of the GBs. A mechanism for the propagation of these twisted cracks involving a segmentation of the crack front and the existence of intergranular parts is discussed and verified for a pressure vessel steel. A similar segmentation seems to occur for short fatigue cracks although, quite surprisingly, this crossing mechanism for fatigue cracks does not seem

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“…Figure 4(a) shows the preferential orientations of the overall scan in terms of MRD (multiplies of random density), which provides a measure of the preferred crystallographic orientation of the material [43]. It can be seen from figure 4(a) that the initial texture of the scan has an intensity of 1.21 (a microstructure with no texture would have MRD = 1).…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Microscale deformation of a tempered martensite ferritic steel: Modelling and experimental study of grain and sub-grain interactions

Golden

Guo

et al. 2016

Journal of the Mechanics and Physics of Solids

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In this paper, a finite-element modelling framework is presented with explicit representation of polycrystalline microstructure for a tempered martensite ferritic steel. A miniature notched specimen was manufactured from P91 steel with a 20,000 hour service history and tested at room temperature under three point bending. Deformation at the microscale is quantified by electron back scattered diffraction (EBSD) before and after mechanical loading. A representative volume element was developed, based on the initial EBSD scan, and a crystal plasticity model used to account for slip-based inelastic deformation in the material. The model showed excellent correlation with the experimental data when the relevant comparisons were made.

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Grain orientation effects on the growth of short fatigue cracks in austenitic stainless steel

Cited by 38 publications

References 19 publications

A crystal plasticity study of cyclic constitutive behaviour, crack-tip deformation and crack-growth path for a polycrystalline nickel-based superalloy

A crystal plasticity study of cyclic constitutive behaviour, crack-tip deformation and crack-growth path for a polycrystalline nickel-based superalloy

Crossing grain boundaries in metals by slip bands, cleavage and fatigue cracks

Microscale deformation of a tempered martensite ferritic steel: Modelling and experimental study of grain and sub-grain interactions

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