versión On-line ISSN 0718-0764
ARAUJO, Bruno A; PALMA, Jorge A; VILAR, Eudésio O y SILVA, Antonio A. Hydrogen Embrittlement of API 5L X60 and API 5L X80 Steels . Inf. tecnol. [online]. 2011, vol.22, n.6, pp.129-140. ISSN 0718-0764. http://dx.doi.org/10.4067/S0718-07642011000600014.
The mechanical behavior of the API 5L X60 and X80 grade steels under environmental hydrogen embrittlement effect and internal hydrogen embrittlement effect was determined. The potential and current density for hydrogen generation were determined by potentiodynamic polarization. The saturation time was estimated from diffusivity and solubility data, obtained from permeation tests with an electrochemical cell. The hydrogen charge to reproduce the conditions of the environmental hydrogen embrittlement and the internal hydrogen embrittlement was performed by generating a concentration gradient in the first case, and a concentration and stress gradients in the second case. After the tensile tests it was verified that in the defined tests conditions, the fracture mode in both types of embrittlement was predominantly ductile. Also, both steels showed low or moderate susceptibility to environmental hydrogen embrittlement, not being susceptible to internal hydrogen embrittlement.
Palabras clave : hydrogen embrittlement; potentiodynamic polarization; API 5L X60 steel; API 5L X80 steel.