Effect of C on the r-value anisotropy of Ti-added IF steels

The macroscopic texture and r-value (width-to-thickness plastic strain ratio in uniaxial tension) anisotropy in Ti-added IF steels were investigated. In order to consider the effect of carbon on r-value anisotropy in the steels, microstructure and texture in the hot-rolled, cold-rolled and annealed specimens were investigated. As the carbon content (18similar to38ppm) increased, the density of fine precipitates in the annealed specimen increases. The specimens including high density of fine precipitates exhibit a strong intensity along the alpha-fibre and lower Deltar-value. In order to clarify the effect of fine precipitates on the r-value anisotropy, predictions of r-value anisotropy were carried out using a full-constraints Taylor polycrystal model. The predicted r-value anisotropy were in good agreement with experimental data. The effect of fine precipitates in lowering the Deltar-value was discussed.