Influence of hydrogen on the deformation behaviour of a ferritic fine-grained low alloy steel

As an example, the influence of hydrogen on the material behaviour of the steel 15MnNi 6-3 at room temperature is demonstrated experimentally and numerically: Tensile tests and JR-tests show that pressurised hydrogen changes the ductility and crack resistance. As well the damage behaviour of the material is described. Moreover, atomistic simulations help to get some insight how hydrogen atoms impede the movement of dislocations. The Rousselier model and a modified decohesion model for taking the influence of hydrogen into account are combined in order to macroscopically analyse the damage behaviour of hydrogen affected round notched tensile and Compact Tension (C(T)) specimens.