The present work explores permeation testing of specimens which are simultaneously loaded in tension to investigate hydrogen-assisted cracking. In this experimental technique, the global hydrogen flux and the mechanical loading are continuously monitored during a tensile test of specimens with U- and V- notches at various cathodic polarization current densities. These experimental conditions allow assessment of the susceptibility of steels under various intensities of hydrogen flux and concentration in several mechanical states. Diffusible hydrogen led to quasi-cleavage fracture at the hydrogen entry surfaces for all the tested conditions. The results of the permeation test (under tensile loading) are incorporated into finite element modeling (FEM) for the evaluation of local conditions for the development of quasi-cleavage fracture, as well as the sensitivity of these threshold conditions (stress, plastic strain, hydrogen flux and concentration) to the intensity of the applied cathodic polarization.

Subject
Fluxes, Hydrogen concentration, Diffusion, Notches, Fracture surfaces, Hydrogen flux, Permeation, Stress, Constants, Mechanical failure, Quality control, Fracture, Hydrogen
Keywords:
hydrogen-assisted cracking, martensitic steel, quasi-cleavage, hydrogen flux
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2021
Association for Materials Protection and Performance (AMPP)
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