Martensite forms under rapid cooling of austenitic grains accompanied by a change of the
crystal lattice. Large deformations are induced which lead to plastic dislocations. In this
work a transformation model based on the sharp interface theory set in a finite strain context
is developed. Crystal plasticity effects the kinetic of the singular surface as well as a
simple model of the inheritance from austenite dislocations into martensite are accounted for.
