Etude des changements de textures par transformation de phase beta-alpha dans des produits TA6V laminés à chaud

Abstract : In the present investigation, the texture transformations induced by alpha beta phase transformation in hot rolled TA6V products were studied. Different samles were rolled at 1050°C (beta field), 900 °C (alpha - beta field). The alpha textures, inherited by phase transformation, were determined by X-ray diffraction or by EBSP and analysed according to the volume proportion of both alpha beta phases and their respective deformation mechanisms. After a 30% deformation at 1050 °C, the inherited alpha texture were characterised by a fibre type texture whereas a 75% deformation favoured the (0°, 90°, 0°) orientation. The originality of this work lies in the determination of the corresponding high temperature beta textures by specific methods. The beta texture, 30% deformed at 1050°C, was characterised by the 100 and 111 fibres. A 75% deformation promoted the 100<110> component in the 100 fibre whereas the 111 one was still observed. This texture evolution were analysed and compared to the results simulated by a rate sensitive Taylor model. The high temperature beta textures were then introduced in a texture transformation model using the Burgers relationship, in order to simulate the inherited alpha textures. The modelling without variant selection allowed to reproduce the fibre texture characteristic of the 30% deformation at 1050°C. After a 75% deformation, the same model made clear that a sharp variant selection mechanisms occured in the beta alpha transformation, favouring the orientations of the alpha phase centred around (0°, 90°, 0°). A transformation texture modelling were proposed in which the alpha variants, associated to the most active slip systems at the end of rolling, appeared preferentially in the transformation. This model allowed to simulate an alpha texture in agreement with the experimental one
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Nathalie Gey. Etude des changements de textures par transformation de phase beta-alpha dans des produits TA6V laminés à chaud. Autre. Université Paul Verlaine - Metz, 1996. Français. ⟨NNT : 1996METZ034S⟩. ⟨tel-01777143⟩

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