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Intergranular corrosion of austenitic stainless steels is associated with the chromium-depleted zone surrounding chromium carbide precipitated at grain boundaries. Computer simulation of intergranular corrosion by means of finite element method (FEM) was compared with the results of electrochemical potentiokinetic reactivation test and Strauss test. Computed corrosion rate of SUS 304 steel agreed with experimental results when specimens were isothermally heated at the temperature range of 823-1,023K. Agreement between computed and experimental results was also observed for 304 steel continuously cooled from 1,073K or below. For samples cooled from 1,073K or above, computed corrosion rate was higher than experimental data because of precipitates deposited inside grains. From these results, the simulation by FEM was found to be able to predict the sensitization of 304 steel at the temperature range of 823-1,073K.

Computer Simulation of Intergranular Corrosion of Austenitic Stainless Steel by Means of Finite Element Method