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Influence of residual stresses on hydrogen embrittlement of cold drawn wires

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Abstract

The purpose of this paper is to investigate the influence of residual stresses, due to cold-drawing, on the hydrogen embrittlement susceptibility of pearlitic wires used for prestressing concrete. Surface residual stresses were measured by X-ray diffraction and a 3D finite element model was used to simulate the drawing process. Hydrogen susceptibility was evaluated through rupture times in NH4SCN tests. The presence of residual stresses may help in explaining the scatter in times to rupture, the disappearance of a stress threshold, the differences in times to rupture of steel wires with the same microstructure, surface quality and mechanical properties, or the saturation in rupture time above certain values of the testing load.

Résumé

Le but de cet article est l'analyse de l'influence des contraintes résiduelles, produites par le tréfilage, sur la sensibilité à la fragilisation par l'hydrogène des câbles d'acier perlitiques utilisés pour le béton précontraint. Les contraintes résiduelles en surface ont été mesurées par diffraction des rayons X et le processus de tréfilage a été simulé avec un code d'éléments finis en 3D. La présence des tensions résiduelles peut aider à expliquer la dispersion des temps de rupture, la disparition d'un seuil de contrainte, les différents temps de rupture des câbles en acier avec la même microstructure, qualité superficielle et propriétés mécaniques, ou même la saturation du temps de rupture en dessous de certaines valuers de la charge de l'essai.

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Authors and Affiliations

  1. Departamento de Ciencia de Materiales, E.T.S.I. Caminos, Profesor Aranguren s/n, Universidad Politécnica de Madrid, E-28040, Madrid, Spain

    M. Elices, J. Ruiz & J. M. Atienza

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  1. M. Elices
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  2. J. Ruiz
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  3. J. M. Atienza
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Editorial note Prof. Manuel Elices is a RILEM Senior Member.

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Elices, M., Ruiz, J. & Atienza, J.M. Influence of residual stresses on hydrogen embrittlement of cold drawn wires. Mat. Struct. 37, 305–310 (2004). https://doi.org/10.1007/BF02481676

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  • DOI: https://doi.org/10.1007/BF02481676

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