Multiscale Model Analysis of the Effects of Martensite Morphology and Martensite Volume Fraction on the Mechanical Property of Dual-Phase (DP) Steels: Parametric Study

Multiscale material modeling is important for directing the material design of heterogeneous materials with concurrent improvements in mechanical properties. In this study, the plastic deformation of DP steels with different microstructures features namely martensite aspect ratio, and martensite volume fraction was investigated. A new methodology that studies the effects and interactions of martensite aspect ratio (equiaxed versus elongated) and martensite volume fraction on the mechanical behavior of DP steels was developed. A multiscale material and structure model using a dislocation density based nonlinear elastic-viscoplastic model was used to predict the mechanical behavior of DP steels under quasi-static loading condition.