Micro-daño asistido por hidrógeno en probetas axisimétricas de acero perlítico progresivamente trefilado con entalla en forma de “V”
- I. Balboa 1
- P. Santos 1
- F. J. Ayaso 1
- B. González 1
- J. C. Matos 1
- J. Toribio 1
- 1 GIFIE Grupo de Investigación en Fractura e Integridad Estructural, Universidad de Salamanca
ISSN: 2792-4246
Year of publication: 2021
Issue: 1
Pages: 237-240
Type: Article
More publications in: Revista española de mecánica de la fractura
Abstract
This paper deals with the hydrogen embrittlement (or hydrogen assisted fracture) in notched samples of progressively drawn pearlitic steel. Different “V”-notches samples were used in order to generate distinct triaxial states (constraint) in the vicinity of the notch tip, as well as distinct hydrostatic stress gradients governing hydrogen diffusion. The wires used in this work were taken from diverse stages of a real drawing chain, including the initial hot rolled bar (not cold drawn), the commercial prestressing steel wire (heavily drawn) and two intermediate steps of the manufacturing process by means of strain hardening. Results show that hydrogen-assisted micro-damage (HAMD) develops in the form of tearing topography surface (TTS), so that the extension and shape of the TTS zone (or HAMD area) depends on the test variables, namely, the notch “V”-angle and the notch-tip radius, since they control the stress-strain distribution in the vicinity of the notch tip, and particularly the hydrostatic stress and its gradient.