Cellular Automata Simulation Of Stress Corrosion Behavior About Stainless Steel

Based on previous numerical methods such as cellular automata model,a simulation model of the stress corrosion process of stainless steel is established.The model is divided into two parts: the simulation of the formation and fracture process of the passive film during the incubation period of pitting corrosion and the simulation of the growth process of pitting corrosion under stress.In the cellular automata simulation of the formation and fracture process of the passive film on the surface of stainless steel,the point defect model is used to calculate the dissolution of the metal matrix and the dissolution probability of the passive film,and the model adds the metal ion representing the point defect in the passive film.Diffusion process.Calculate the current density during the growth of the passivation film,and obtain results that are in line with the empirical conclusion,and calculate the point defect concentration and the thickness of the passivation film in the model under different simulation potentials,and finally get a simulation that is consistent with the theory and previous experiments result.After adding the passivation film rupture rule to the model,the passivation film rupture time under different potentials is obtained,which is also consistent with the experimental results.In simulating the growth process of pitting corrosion of stainless steel under stress,the cellular automata method is combined with the phase-field microelasticity method,the cellular automata method is used to simulate the corrosion process,and the phase-field microelasticity method is used to calculate the stress effect.The effects of different stresses on the growth of pitting corrosion are discussed,the different effects of elastic strain and plastic strain on pitting corrosion are analyzed,and the distribution of elastic and plastic strains around the pitting pits is analyzed based on the stress and strain distribution diagrams.