Influencia del hidrógeno en la tenacidad a la fractura del acero 42CrMo4 templado y revenido y del acero inoxidable dúplex 2205
- V. Arniella 1
- G. Álvarez 1
- M. Llera 1
- J. Belzunce 1
- C. Rodríguez 1
- 1 Grupo de investigación SIMUMECAMAT, Escuela Politécnica de Ingeniería. Universidad de Oviedo. Campus Universitario, Gijón, España
ISSN: 2792-4246
Année de publication: 2023
Número: 6
Pages: 3-8
Type: Article
D'autres publications dans: Revista española de mecánica de la fractura
Résumé
The influence of in-situ hydrogen charging on the fracture toughness of a 42CrMo4 steel quenched and tempered at 700°C for 2 hours and a 2205 duplex stainless steel was evaluated. For this purpose, fracture toughness tests were performed using SENB specimens while hydrogen was electrochemically introduced from acid and saline solutions under different current densities. In order to correlate fracture toughness results to the amount of hydrogen introduced, hydrogen absorbed contents were determined for different charging conditions. The influence of the applied displacement rate was also evaluated. Fracture toughness decreased as current density increased and/or when a more hydrogenated medium is employed (acid medium against saline one) and as the displacement rate is decreased. Evident modifications in the operative failure micromechanisms were also observed, from ductile micromechanism (coalescence of microvoids, MVC) in the absence of hydrogen in both steels, to more brittle micromechanisms characterized by different decohesion phenomena in presence of hydrogen.