A model for determining initial dislocation-densities associated with martensitic transformations

Abstract

A three-dimensional multiple-slip dislocation-density-based crystal plasticity formulation, and specialised finite element formulations were used to determine the initial dislocation-densities associated with martensitic transformations in steel alloys. The analysis is based on modelling the shear part from the phenomenological theory of martensitic transformation to obtain both the transformation mobile and immobile dislocation-densities. The model was validated with experiments related to the transformation of lath martensite in high-strength low-alloying steels.

Keywords:

• Martensitic phase transformation
• Martensitic steel
• Dislocation-densities
• Finite element analysis

Support from the Office of Naval Research, through grant no. N000140510097, is gratefully acknowledged.