par He, Yan;Godet, Stéphane ;Jacques, Patrice;Jonas, J.J.
Référence International Conference(29.05.2005-03.06.2005: Phoenix, AZ, United States), Solid-Solid Phase Transformations in Inorganic Materials 2005, Vol. 1, page (161-166)
Publication Publié, 2005
Publication dans des actes
Résumé : The orientations of kamacite (α) lamellae transformed from a single prior-taenite (γ) grain were measured by analyzing the EBSD (electron backscatter diffraction) patterns; these were compared with the orientation of the retained taenite on pole figures. The orientation relations between the α and γ phases in the plessite (a two-phase mixt. of α and γ) regions were also characterized. All the variants corresponding to the Kurdjumov-Sachs (K-S) and Nishiyama-Wassermann (N-W) relationships were obsd., as were the intermediate reflections located between the coplanar K-S and N-W variants. The local misorientations between individual fcc and bcc crystals along their common interfaces were computed and it was found that the exact orientation relation varies along the boundary, a significant proportion of which does not satisfy any of the relations exactly. Orientation variations of up to about 10 degrees were obsd. within individual kamacite lamellae; these usually covered the range from one K-S variant, through the N-W position, to the other coplanar K-S variant. Numerous Neumann bands (mech. twins) were also detected within the kamacite lamellae, which indicate that some sort of deformation occurred during or after the α-to-α transformation.