Measurements by SKPFM and Finite‐Element Modeling of Hydrogen Atom Diffusion and Distribution in Ferrite and Bainite Contained in X80 Steel

Herein, the diffusion and distribution of hydrogen (H) atoms in ferrite bainite contained an X80 pipeline steel is studied by both scanning Kelvin probe force microscopy finite-element modeling. The effect metallurgical microphases on H-atom accumulation analyzed. It showed results that H-charging elevates electrochemical dissolution activity steel, as indicated increased Volta potential thus decreased work function. H tend to accumulate at ferrite, making local concentration much greater than bainite. imply that, compared with bainite, location more initiating hydrogen-induced cracks once reaches a threshold value.