Mechanics of phase boundaries

Economic and environmental issues are leading to innovations throughout the automotive  industry for cost and pollution reduction. These challenges have led to the development of Advanced High Strength Steels, e.g. Dual Phase (DP) steels. Key to these types of steels is their complex microstructure, which allows engineers to tune the material properties, by changing the microstructure of the material.

PhD candidate: ir. Michael Dogge
Daily supervisor: dr. ir. Ron Peerlings
Project supervisor: Prof. dr. ir. Marc Geers
Financing: Materials innovation Institute (M2i) and Tata Steel

In order to engineer such materials to their desired properties, predictive numerical models are required including the behavior of dislocations, i.e. defects in the crystal lattice. Dislocations are the carriers of plastic deformation, and their interactions governs the macroscopic behavior of the material.

Standard material models do not capture the influence of the underlying microstructure on the material’s overall response. Understanding this influence is the key to developing new, better suited materials and material models for use in the industry. The goal of this project is to create an understanding of the relevant physics at phase boundaries and their effect on the hardening and plastic behavior of DP steels.

An idealized representation of a Dual Phase steel  is used to develop a numerical model incorporating the relevant behavior of dislocations, such that the consequences of different microstructures can be explored.