Application of rigorous infinitesimal deformation approach to martensitic transformation observed in some Fe-Ni-C alloys

501-505 Rigorous infinitesimal deformation approach has been used to predict the phenomenological crystallographic parameters such as amount of lattice invariant shear, magnitude of total shape deformation, orientations of habit planes, etc. associated with martensitic phase transformation fcc to bct observed in the alloy Fe-22Ni-0.8C and Fe-29.37Ni-0.34C. The values obtained for the crystallographic parameters in the present study and those from the infinitesimal deformation (ID) approach and experiments have been compared with one another.