Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
On the effect of pre-strain on hydrogen embrittlement susceptibility of structural steels
Submission Author:
Pedro Paiva Brito , MG , Brazil
Co-Authors:
Cláudio Augusto Gomes Filho, Erberte Costa, Pedro Paiva Brito
Presenter: Pedro Paiva Brito
doi://10.26678/ABCM.COBEM2021.COB2021-1680
Abstract
In numerous offshore or coastal applications, structural steels are subject to environmental degradation. In particular, condensation near crevices which appear in bolted or riveted joints may become acidified intensifying corrosion rates and causing embrittlement because of hydrogen absorption. In the present work, a systematic investigation of the hydrogen embrittlement of AISI 1020 steels submitted to different levels of preliminary plastic strain was performed. Tensile test samples were prepared from hot-rolled bars, which were annealed and subject to different levels of plastic strain in uni-axial tension (0.0, 6.0 and 12.0% after yielding). Hydrogen permeation was accomplished by cathodic charging in neutral 0.6M NaCl and 0.5M H2SO4 solutions for 24 hours with a 30mA/cm2 current. The results obtained revealed that the structural steels, under the tested conditions, were less susceptible to embrittlement when exposed to the neutral solution but suffered significant losses in ductility in the presence of acid.
Keywords
Hydrogen embrittlement, Mechanical Properties, Structural Steel, Cathodic Charging
