Tensile behavior of ferritic/austenitic iron with a bimodal structure: An atomistic study

Molecular dynamics simulation was used to investigate the effect of grain size on the tensile process of nano-duplex stainless steel with bimodal structure distribution. Through the stress-strain curve, the percentage change curve of different atomic types and the atomic configuration diagram from different perspectives, it is found that the deformation mechanism of nano duplex stainless steel with bimodal structure distribution is different from that of ordinary bimodal structure materials. Small grains take the lead in enhancing model plasticity through the generation and activity of dislocations, while large grains enhance plasticity by promoting the phase transition of the model and suppressing the generation and activity of dislocations within small grains.