Damage mechanism and modeling of void nucleation process in a ferrite–martensite dual phase steel

Damage initiation and growth behavior in high strength dual phase sheet steel, i.e. DP780, was investigated using smooth and notched tensile specimens. By SEM microstructural analyses of pulled and sectioned tensile specimens, void initiation and growth behavior were quantified. Finally, a simple model was proposed to predict the void nucleation kinetics for both kinds of specimens. The predicted values were in good agreement with the experimental data using the model.