Anisotropy of Dislocation Distribution and Long-Range Internal Stresses

Mohamed, Ghuson H.; Bacroix, Brigitte; Lebrun, J. L.

doi:10.4028/www.scientific.net/msf.347-349.285

Cited by 2 publications

(1 citation statement)

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“…This approximation is often shown to be consistent with the peak broadening analysis [30,35,36]; (ii) Crystal plasticity is sometimes used to reduce the number of populated systems; this approach is most often shown to improve [11,16,37] or more rarely to deteriorate the quality of the fitting procedure (exposed below) [38]; it is sometimes completed by somewhat arbitrary assumptions on the dislocation character [11]; (iii) All possible slip systems are taken into account and assumed to be equally populated, but the character (screw, edge or mixed) is not a priori set, but deduced from a minimization process [31].…”

Section: The Influence Of the Number Of Considered Slip Systemssupporting

confidence: 66%

The evolution with strain of the stored energy in different texture components of cold-rolled IF steel revealed by high resolution X-ray diffraction

Wauthier-Monnin

Chauveau

Castelnau

et al. 2015

Materials Characterization

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. During the deformation of low carbon steel by cold-rolling, dislocations are created and stored in grains depending on local crystallographic orientation, deformation, and deformation gradient. Orientation dependent dislocation densities have been estimated from the broadening of X-ray diffraction lines measured on a synchrotron beamline. Different cold-rolling levels (from 30% to 95% thickness reduction) have been considered. It is shown that the present measurements are consistent with the hypothesis of the sole consideration of screw dislocations for the analysis of the data. The presented evolutions show that the dislocation density first increases within the α fiber (={hkl}b110N) and then within the γ fiber (={111}buvwN). A comparison with EBSD measurements is done and confirms that the storage of dislocations during the deformation process is orientation dependent and that this dependence is correlated to the cold-rolling level. If we assume that this dislocation density acts as a driving force during recrystallization, these observations can explain the fact that the recrystallization mechanisms are generally different after moderate or large strains.

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