Characterization of intergranular corrosion of Type 310 stainless steel using cellular automaton method by considering various corrosion rates of grain boundaries

Igarashi, Takahiro  ; Komatsu, Atsushi ; Motooka, Takafumi; Ueno, Fumiyoshi  ; Yamamoto, Masahiro 

We simulated intergranular corrosion considering various fluctuations of corrosion rates (CR) for grain boundaries (GB): exponential, normal and uniform distributions. The relationship among the roughness of corroded surface, maximum intergranular corrosion depth, and fluctuations of CRs of GBs was evaluated. The cross-sectional images by simulation with the case of exponential distribution was relatively resemble to cross-sectional images obtained by corrosion tests in terms of roughness of corrosion surface. The simulation using normal and uniform distributions of CR of GB indicated that maximum corrosion depth became deeper with increasing deviation range of fluctuations. These results suggested that the roughness of corroded surface was controlled by fluctuation of CRs of GBs.