Mesoscopic model of hydrogen embrittlement in particle strengthened materials

This work focuses on the constitutive modelling of damage development in particle strengthened materials presence hydrogen. We apply model to an area at interface a dissimilar weld 8630 steel/IN625 nickel alloy which is known as ‘featureless region’. region contains array M7C3 carbides each measuring about 40 nm. Cleavage-like fracture has been observed only hydrogen and it attributed combination two types embrittlement mechanisms: hydrogen-induced decohesion (HID) along M7C3-matrix ductile-type (Hydrogen Enhanced Local Plasticity, HELP). Modelling behaviour this continuum level not appropriate major role material response interaction carbide particles with dislocations captured mesoscopic level. Here we propose zone’ that accurately represents effect scale. Hydrogen enhances evolution around carbides, therefore stress locally increases affecting interfacial strength. The result that, high concentration, exhibits softening.