Influence of local crystallographic configuration on microcrack initiation in fatigued 316LN stainless steel: Experiments and crystal plasticity finite elements simulations

Signor, Loïc; Villechaise, Patrick; Ghidossi, Thomas; Lacoste, Emmanuel; Gueguen, Mikaël; Courtin, S.

doi:10.1016/j.msea.2015.09.119

Cited by 40 publications

(32 citation statements)

References 40 publications

(66 reference statements)

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“…Fatigue crack initiation is related to the basic properties of the material like chemical composition, crystalline structure, degree of strain localization, and others but also to grain size and straining amplitude. As reported earlier in austenitic stainless steels the cracks prefer to grow in the grains with the Schmid factor higher than 0.4 along one of the {111} <110> slip systems. This statement is in agreement with the previous observations based on crack initiation in PSMs .…”

Section: Discussionsupporting

confidence: 69%

“…The early growth of stage I cracks is characterized by their mutual interlinking. 51 Cracks link together typically along the secondary slip systems, which are frequently associated with emerging slip markings on the grain surface ( Figure 3). For that reason, the straight growth of the initiated cracks was observed only occasionally.…”

Section: Crack Initiation and Growthmentioning

confidence: 99%

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Initiation and growth of short fatigue cracks in austenitic Sanicro 25 steel

Mazánová

Polák

2018

Fatigue Fract Eng Mat Struct

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Austenitic heat‐resistant stainless steel Sanicro 25, often used in energy production installations, was cyclically strained at room temperature, and initiation and growth of short fatigue cracks have been studied. Cylindrical specimens with pre‐existing shallow notch were cyclically strained under constant total strain amplitudes, while the surface relief, crack initiation, and short crack growth were observed, in‐situ, using optical and electron microscopes. Persistent slip markings were found to be the principal locations where natural fatigue cracks initiated. The character of the crack paths of short cracks was studied using SEM and EBSD techniques. The results exhibit prevailing transgranular crack growth, ie, along the persistent slip markings within the grains. The growth of the largest cracks in the central part of the shallow notch was measured for different applied strain amplitudes. Because the coalescence of initiated cracks plays a significant role during crack growth, the use of the “equivalent crack” concept gives adequate results in the description of the crack growth rate. The crack growth law of short cracks was established and compared with the Manson‐Coffin law of the material.

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Section: Discussionsupporting

confidence: 69%

Section: Crack Initiation and Growthmentioning

confidence: 99%

Initiation and growth of short fatigue cracks in austenitic Sanicro 25 steel

Mazánová

Polák

2018

Fatigue Fract Eng Mat Struct

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“…It seems, in fact, that grain-scale CP model calibration against tensile curves may not be sufficient to validate the model also on a local (sub-grain) scale. This is especially relevant, for example, when performing polycrystalline FE simulations of (intergranular) crack propagation (e.g., [6,19,21]), where strong geometrical amplification of stresses close to a crack tip is expected to increase the sensitivity of the model response (i.e., crack growth) to the involved uncertainties in the CP model. …”

Section: Local Fieldsmentioning

confidence: 99%

“…For example, there is a growing tendency of building [15] and using FE models that resemble true grain topology, true texture and/or realistic loading conditions with the intention to compare the predictions of emerging local phenomena of the underlying CP models (e.g., grain boundary stress concentrations [16][17][18], plastic strain localization and the formation of slip bands [19,20], crack initiation and propagation [6,19,21]) directly with measurements. In such cases, appropriately-calibrated constitutive laws would certainly be required, which, however, is not a trivial task.…”

Section: Introductionmentioning

confidence: 99%

Combining Single- and Poly-Crystalline Measurements for Identification of Crystal Plasticity Parameters: Application to Austenitic Stainless Steel

Shawish

Cizelj

2017

Crystals

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Abstract:Crystal plasticity finite element models have been extensively used to simulate various aspects of polycrystalline deformations. A common weakness of practically all models lies in a relatively large number of constitutive modeling parameters that, in principle, would require dedicated measurements on proper length scales in order to perform reliable model calibration. It is important to realize that the obtained data at different scales should be properly accounted for in the models. In this work, a two-scale calibration procedure is proposed to identify (conventional) crystal plasticity model parameters on a grain scale from tensile test experiments performed on both single crystals and polycrystals. The need for proper adjustment of the polycrystalline tensile data is emphasized and demonstrated by subtracting the length scale effect, originating due to grain boundary strengthening, following the Hall-Petch relation. A small but representative volume element model of the microstructure is identified for fast and reliable identification of modeling parameters. Finally, a simple hardening model upgrade is proposed to incorporate the grain size effects in conventional crystal plasticity. The calibration strategy is demonstrated on tensile test measurements on 316L austenitic stainless steel obtained from the literature.

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“…Ghidossi and L. Signor at Pprime institute, see ref. [14] for more details) is meshed. The grain aggregate is fitted with a crystal plasticity behavior [15] and fatigue cycles are computed to try to reproduce the experimentally observed fatigue crack initiation locations (see Figure 2).…”

Section: Voxel-based Meshing Of Multi Labeled Imagesmentioning

confidence: 99%

Coupling Diffraction Contrast Tomography with the Finite Element Method

Proudhon

Reischig

et al. 2015

Adv Eng Mater

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This paper explains how to turn full three dimensional (3D) experimental grain maps into a finite elements (FE) mesh suitable for mechanical analysis. Two examples from diffraction contrast tomography characterizations are presented. Deformation of a pure titanium sample with 1400 grains is computed using elastic anisotropy and accurate boundary conditions allows to correctly capture the grain to grain elastic strain variations. In the second example a significantly large zone of a polycrystalline Al-Li sample is meshed and computed using elastoplastic finite strain calculation. Mean lattice reorientations and intra-grain lattice orientation spread are obtained as a function of deformation.

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Influence of local crystallographic configuration on microcrack initiation in fatigued 316LN stainless steel: Experiments and crystal plasticity finite elements simulations

Cited by 40 publications

References 40 publications

Initiation and growth of short fatigue cracks in austenitic Sanicro 25 steel

Initiation and growth of short fatigue cracks in austenitic Sanicro 25 steel

Combining Single- and Poly-Crystalline Measurements for Identification of Crystal Plasticity Parameters: Application to Austenitic Stainless Steel

Coupling Diffraction Contrast Tomography with the Finite Element Method

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