Journal
ACTA MATERIALIA
Volume 115, Issue -, Pages 314-323Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2016.05.040
Keywords
Anelastic strain; Dislocation structure; Tensile test; X-ray diffraction
Funding
- Dutch Technology Foundation (STW)
- Research Program of the Materials innovation institute (M2i) [S22.1.13494b]
- M2i
- Tata Steel RDT
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The pre-yield deformation behaviour (i.e., at stresses below the yield stress) of two materials, pure iron and a low-alloy steel, and its anelastic nature are analysed at room temperature, before and after the dislocation structures are varied by plastic deformation. It is shown, based on tensile experiments, that this behaviour can be explained by limited reversible glide of dislocations without essential changes in the dislocation structure. Moreover, a physically-based model that characterises the dislocation structure by two variables, the dislocation density and the effective dislocation segment length, is used to quantitatively describe this deformation behaviour. The model validity is further evaluated by comparison with dislocation densities from X-Ray Diffraction measurements. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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