J. Phys. IV France 05 (1995) C8-317-C8-322
Transformation Mechanism of Deformation - Induced Compact Martensite in Fe-Ni-C AlloysX.M. Zhang1, T.R. Hu1, X.M. Meng1, Y.Y. Li1, E. Gautier2 and J.S. Zhang2
1 Laboratory of Atomic Imaging of Solids, Institute of Metal Research, Academia Sinica, Shenyang, 110015, China
2 Laboratoire de Science et Génie des Matériaux Métalliques, URA 159 du CNRS, Ecole des Mines, Parc de Saurupt, 54042 Nancy cedex, France
Compact deformation - induced martensite found in Fe - 25Ni - 0.66C alloys has been studied by using optical, electron and scanning electron microscopy. The compact martensite consists of a large number of martensites with different variants connected closely to form large bulk in which almost no residual austenite remains. Its formation process is by further growth of thin plates to form lenticular plates and possible crossing and coalesence to form bulky martensite. These growth and coalesence are through martensitic twinning or twinning domains during deformation which leads to various interactions between the plates including cross, insert, coalescence and conversion. The substructure of the martensite is a crisscross twinning net. The corresponding deformation modes of the austenite are also studied.
© EDP Sciences 1995