Influence of hydrogen on plasticity around the crack tip in high strength steels

Assessment of Hydrogen Embrittlement Susceptibility and Mechanism(s) in Quench and Tempered AISI 4135 Steel Using A Novel Fast Fracture Test in Bending

“…As a result, there is no clear consensus in the literature on how H interacts with dislocations, influencing dislocation dynamics. However, dislocation emission from a crack tip is restricted and plasticity could get diminished in the presence of H, as reported in several papers for iron and its alloys [47,48]. Here, the higher susceptibility of Steel 4 can be explained qualitatively.…”

A fast fracture approach to assess hydrogen embrittlement (HE) susceptibility and mechanism(s) of high strength martensitic steels

“…This phenomenon can be only effective if extensive plastic deformation occurs. However, limitation of plasticity and consequent reduction of plastic zone size in case of in presence of H are reported in several papers for iron and its alloys [58][59][60][61][62]. Nevertheless, even if, there is reduction in plastic zone size in presence of H, 4140 will have advantage over the other materials and thus, it qualitatively explains its lowest susceptibility.…”

Critical hydrogen concentration for crack propagation in a CrMo steel: Targeted experiments for accurate numerical modelling

“…The literature used some experimental approaches to understand the active mechanisms inducing hydrogen embrittlement, focusing the attention on fracture mechanics tests, i.e. fracture toughness [6][7][8] and fatigue crack growth tests [9][10][11][12][13]. However, the identification of single or multiple active mechanisms is still debated, because each steel behaves differently and can be more or less prone to hydrogen embrittlement based on its microstructure and alloy elements, as well as on the type of applied load.…”