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Orientation relationships and variant selection during the γ-to-αb transformation in a hot-rolled trip steel

par Godet, Stéphane ;He, Yan;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 (545-550)
Publication Publié, 2005

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Résumé :

The transformation behavior of a 0.22wt%C-1.50wt%Mn-1.56wt%Si-0.045wt%Nb TRIP steel was studied after controlled rolling. Deformation below the no-recrystn. temp. was employed to strain the prior austenite. Using automated EBSD techniques, both the retained austenite and bainite orientations were measured; the orientation relationships between these phases are represented in pole figure form. The obsd. orientations are compared to the predictions assocd. with various correspondence relationships reported in the literature. The bainite does not follow any of these predictions exactly and exhibits a continuous spread, mainly between two coplanar Kurdjumov-Sachs variants. Moreover, the initial spread of orientation in the parent austenite grains rendered the detn. of a precise correspondence relationship somewhat difficult. The occurrence of variant selection during the nucleation and growth of bainite within deformed austenite grains is illustrated and the observations are compared to the predictions obtained from a dislocation-based model.