Local orientation change inside lenticular martensite plate in Fe-33Ni alloy

The orientation relationship of lenticular martensite (M) with respect to austenite (A) is nearly Greninger-Troiano at the midrib and twinned region but gradually deviates towards Kurdjumov-Sachs near the M/A interface. This change is related to the change in the substructure of martensite and also to the deformation in the surrounding austenite.