Theoretical modelling of iron nitriding coupled with a nanocrystallisation treatment. Application to numerical predictions for ferritic stainless steels

► Nitriding on ferritic steels is modelled by a simultaneous multiscale/multiphysics approach. ► A duplex nanocrystallisation/nitriding treatment is investigated. ► Numerical results show a significant influence of nanocrystallisation on penetration depth.