Event Timeslots (1)
Day 1 – June 20
The 300 series austenitic stainless steel finds extensive use as structural materials in the nuclear industry wherever high strength and corrosion resistance are needed. The single order parameter phase-field model presented here shows how to utilize polarization potentials obtained from the Pourbaix diagrams to simulate the transition between the fast initial pitting and later stage slow continuous pit growth on the surface of 316L stainless steel. The ionic species concentrations at the metal surface obtained using concentration-dependent electrode polarizations agree well with the concentrations obtained using the constant polarization model. This property significantly speeds up simulation time in the stable pitting regime and thus increases the model's predictive capabilities. The second part of the work presents a multi-phase field model based on extending the Kim-Kim-Suzuki formulation. It allows to predict the behaviour of insoluble corrosion products on the corroding metal surface and gives an example of an easy to implement multi-phase field tool.