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Abstract

The object of investigations was two-phase steel having the austenitic structure with ferrite precipitates (volume fraction about I 0% ). The material was subjected to cold rolling up to about 85% of deformation and subsequently annealed within the temperature range 750°C+l000°C. X-ray investigations included the phase analysis, measurements of pole figures and calculations of the orientation distribution functions (ODF's) for both component phases. The textures of austenite and ferrite after the final rolling reduction and successive stages of annealing were analysed within the centre and surface layers of the sheets. Examination of the austenite recrystallization texture included additionally the analysis of orientation fibres and transformations of the experimental and ideal ODF's. From the texture analysis it results that the mechanisms controlling the development of the austenite recrystallization texture is the selective growth of twins. Texture simulations indicate that austenite rolling texture can be transformed into the recrystallization texture according to twin relation, i.e. by rotation through an angle of (2n - I) x 60° about < I 11 >poles. A certain contribution of the oriented growth into the texture formation was also found. In that case relation between the recrystallization and deformation textures may be described by rotation 30°+40°/<111>. In both cases a variant selection of the rotation axis takes place. Based on the texture examination and the phase analysis it is additionally assumed that the (a ➔y) phase transformation may exert some effect on the recrystallization textures of both component phases
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Authors and Affiliations

Wiktoria Ratuszek
Janusz Ryś
Joanna Piniążek
Joanna Kowalska

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