Hydrogen trapping mechanism of different duplex stainless steels alloys

A linear model of Lee and Lee was applied to calculate the trap activation energies of lean duplex and super duplex stainless steels. It was found that the lean duplex stainless steel presents ∼30% higher activation energy's values than the super duplex stainless steel, due to a less steady γ phase, which will eventually cause an increase in hydrogen diffusion. The relation between the microstructure and the hydrogen trapping of lean duplex stainless steel and super duplex stainless steel in the presence of hydrogen is discussed in detail.