J. Phys. IV France 05 (1995) C8-531-C8-536
The Observation of the Martensite-Like Shear Diffusionless α→γ Transformation in Carbon Steels with Pearlitic StructureV.M. Schastlivtsev1, I.L. Yakovleva1, T.I. Tabatchikova1 and D.A. Mirzaev2
1 Institute of Metal Physics, Ural Division of Russian Academy of Sciences, Ekaterinburg, Russia
2 Chelyabinsk' State Polytechnical University, Chelyabinsk, Russia
The structure of eutectoid carbon steel with the initially pearlitic structure was studied by transmission electron microscopy and electron diffraction after laser heating. It is shown that, under ultrarapid laser heating, the α-γ phase transformation can proceed by a shear-type diffusionless mechanism that results in the deformation of cementite platelets. The crystallographic characteristics of shear planes involved in the α-γ transformation are determined. Austenite formation was found to occur through the diffusionless shear mechanism, with orientation relationships close to those of Kurdjumov-Sachs.
© EDP Sciences 1995