Hydrogen Assisted Cracking of High Strength Alloys

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Strain gradient plasticity-based modeling of hydrogen environment assisted cracking (2016, methodology): “plasticity (HELP) [9], predict trends in the subcritical crack growth rate properties of alloys stressed in environments that produce atomic hydrogen (H) via chemical and electrochemical reactions on crack tip surfaces [7,10].”
The influence of hydrogen on the mechanical and fracture properties of some martensitic advanced high strength steels studied using the linearly increasing stress test (2015, background): “The HELP mechanism has considerable support [15, 26, 27], even though, at first blush, the terms enhanced plasticity and embrittlement appear contradictory.”
Hydrogen embrittlement phenomena and mechanisms (2012, background): “A featureless fracture surface sometimes observed by scanning electron microscopy (SEM) at high magnifi cations is often taken as evidence that decohesion has occurred [13] , but it is debatable whether SEM is able to resolve suffi ciently small, shallow dimples that crack growth by very localised p”
Multi-scale and spatially resolved hydrogen mapping in a Ni–Nb model alloy reveals the role of the δ phase in hydrogen embrittlement of alloy 718 (2016, background): “According to the fracture surfaces of the hydrogen containing samples, on the near surface area no void-like structures were found on facet surfaces, indicating interface decohesion instead of void formation as the major cause of material damage [39].”