Thermomechanical phase transformation in dual phase steels

Motivation and goals:

Because of their high ductility and strength dual phase steels are highly attractive for lots of structural applications. The combination of high strength and ductility is due to the austenite to martensite phase transformation during the prouction process. Project A 23 is concerned with the thermomechanical modelling of the martensitic phase transformation using a sharp-interface theory (Abeyaratne, Knowles 1990) within a finite strain framework.

Due to locally large transformation strains plastic effects occur both inside the austenite and martensite phase. Hence, additionally plasticity has to be considered for the austenite and martensite phase. The model is based on a simple laminate homogenization. 

Comparison of different laminate substructures with respect to their transformation behaviour and energy relaxation.

Simualtion of thermally and mechanically induced martensitic.phase transformation.

Simulation of lath martensite using a Rank-1 laminate under consideration of crystal plasticity inside the austenite and martensite. Additionally different martensite variants are accounted for. 

Developement and implementation of a model to simulate displacive phase transformation within a finite strain framework based on laminate substructures.

Examination of the martensitic phase transformation under thermal and mechanical boundary conditions.