Local Evolution of Microstructure and Microchemistry Near Grain Boundaries in Irradiated Austenitic Stainless Steels

Simonen, E.P.; Edwards, D.J.; Bruemmer, S.M.

doi:10.1002/9781118787618.ch116

Cited by 2 publications

(1 citation statement)

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“…Corresponding crack initiation mechanisms were investigated experimentally for copper [18] and nickel [19] subjected to cyclic loadings. Concerning irradiation assisted stress corrosion cracking (IASCC), channeling is considered as promoting GB crack initiation as well [20][21][22]2] even if other mechanisms are influent.…”

Section: Introductionmentioning

confidence: 99%

Influence of Slip Localization on Surface Relief Formation and Grain Boundary Microcrack Nucleation

Sauzay

Evrard

Bavard

2011

KEM

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Slip localization is often observed in metallic polycrystals after cyclic deformation (persistent slip bands) or pre-irradiation followed by tensile deformation (channels). To evaluate its influence on surface relief formation and grain boundary microcrack nucleation, crystalline finite element (FE) computations are carried out using microstructure inputs (slip band aspect ratio/spacing). Slip bands (low critical resolved shear stress (CRSS)) are embedded in small elastic aggregates. Slip band aspect ratio and neighboring grain orientations influence strongly the surface slips. But only a weak effect of slip band CRSS, spacing and grain boundary orientation is observed. Analytical formulae are deduced which allow an easy prediction of the surface and bulk slips. The computed slips are in agreement with experimental measures (AFM/TEM measures on pre-irradiated austenitic stainless steels and nickel, copper and precipitate-strengthened alloy subjected to cyclic loading). Grain boundary normal stresses are computed for various materials and loading conditions. A square root dependence with respect to the distance to the slip band corner is found similarly to the pile-up stress field. But the equivalent stress intensity factor is considerably lower. Analytical formulae are proposed for predicting the grain boundary normal stress field depending on the microstructure lengths. Finally, an energy balance criterion is applied using the equivalent elastic energy release rate and the surface/grain boundary energies. The predicted macroscopic stresses for microcrack nucleation are compared to the experimental ones.

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