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Modelling of the effect of interface morphology on hydrogen diffusion in a clad plate

Clad plate has been widely used to fabricate pressure vessels, but a lot of cracks have been found around the interface between the base metal and the clad metal in hydrogen-containing environments. This work studies the hydrogen diffusion in a clad metal. A finite element model is built to simulate the hydrogen diffusion in a clad plate during the shut down, and the effect of interface morphology has been studied. It is shown that the hydrogen diffuses to the interface, and the peak hydrogen concentration occurs at the interface on the clad metal side. The wavy interface has a smaller hydrogen concentration than the straight line interface. With wave length and amplitude increase, the hydrogen concentration is decreased. The hydrogen concentration increases as the clad metal thickness decreases. When the base metal thickness increases, the hydrogen concentration increases.