Peridynamic modeling of liquid metal dissolution corrosion in 316L stainless steel/Lead-Bismuth Eutectic systems

This paper develops a peridynamic framework for modeling liquid metal dissolution corrosion in 316L stainless steel/liquid lead-bismuth eutectic (LBE) systems. The proposed model integrates two dominant corrosion mechanisms: interfacial metal dissolution and subsequent diffusion in the liquid phase. A dual-process calibration methodology is established to determine temperature-dependent diffusion coefficients for both cold-drawn (CD) and solution-annealed (SA) 316L stainless steel in the 400–550 °C range. By applying the PD model to simulate the dissolution “pitting” process and comparing it with experimental results, the effectiveness of the model is validated. Moreover, the growth and fusion process of “pitting” under different temperature conditions are simulated, with the final pit morphology being in good agreement with experimental observations. Finally, by combining the oxygen concentration with the probability of oxide layer failure, the influence of oxygen concentration on dissolution corrosion behavior is qualitatively analyzed. This model comprehensively considers the synergistic effects of material processing methods, temperature, and oxygen concentration on corrosion behavior, making it one of the few models capable of simulating the dissolution corrosion of 316L stainless steel in liquid LBE.