Hydrogen Diffusion Simulation in Dual Phase Microstructure Considering the Difference in Diffusion Constants

Abstract

To evaluate the effect of the dual-phase microstructure on hydrogen diffusion behavior, a numerical simulation using a two-dimensional dual-phase model was performed. The effect of the dual-phase microstructure was evaluated by changing the morphological parameters such as the shape and geometrical distribution of the austenite phase using two different phase fractions. The results indicated that the hydrogen does not diffuse through the higher coefficient phase on a preferential basis; instead, the diffusion occurs with the same time dependency in both phases. In addition, the layered pattern of the austenitic phase and the higher phase fraction of the austenite phase reduced the degree of hydrogen diffusion. The hydrogen diffusion in dual-phase steel is significantly affected by the difference in the hydrogen diffusion constants and morphology of the microstructure of the dual-phase steel.