Elucidating the contribution of mobile hydrogen-deformation interactions to hydrogen-induced intergranular cracking in polycrystalline nickel

On the suitability of slow strain rate tensile testing for assessing hydrogen embrittlement susceptibility

“…tion of applied potential and material heat The force-time data obtained from each SSRT experiment as a function of applied potential for the four tested Monel K-500 material heats are shown in Figure 2. Consistent with prior fracture mechanics-based testing of HEAC susceptibility in Monel K-500 [7,43,52,58], the time to failure was generally found to decrease across all tested material heats with increasingly negative applied potential; a similar trend was also noted for the applied load. As reported in prior work [42], all specimens exhibited intergranular fracture during testing at -1100 mV SCE , though the center of the specimens failed via ductile microvoid coalesence.…”

A phase field model for elastic-gradient-plastic solids undergoing hydrogen embrittlement

“…Hydrogen atoms enter the material, diffuse through the crystal lattice and are attracted to regions of high hydrostatic stress, where damage occurs through mechanisms that are still being debated (Harris et al, 2018;Lynch, 2019;Robertson et al, 2015;Shishvan et al, 2020;Tehranchi and Curtin, 2019;Yu et al, 2019). By accounting for the degradation of the fracture energy with hydrogen content, multi-physics phase field fracture models capture the trends shown in the experiments (see, e.g., Martínez-Pañeda et al, 2020), while establishing a computational framework capable of dealing with the complex scenarios relevant to engineering practice.…”

Applications of phase field fracture in modelling hydrogen assisted failures

“…Hydrogen ingress into a metallic sample can happen during its initial forming, during the coating or plating of a protective layer, through exposure to hydrogen or hydrogen-containing molecules in the air, soil or water, or through corrosion processes. Hydrogen absorbed from gaseous or aqueous environments diffuses within the metal and is attracted to areas of high hydrostatic stress, where damage takes place by means of mechanisms that are still being debated [4][5][6][7].…”