Microstructure And Texture Of Interstitial-Free Steel Sheet By Side-rolling

Owing to its excellent deep drawing ability and no-aging performances, IF steel becomes a new generation of drawing steel following boiling steel and aluminum killed steel. The drawing ability of IF steel sheet is a direct function of the texture formed during cold rolling and recrystallization annealing. New texture components are acquired by use of new rolling techniques which can extend the application range of IF steel. Mechanism of macro-texture formation of side-rolled and recrystallization annealed IF Steel are studied. Meanwhile, a single texture orientation is also obtained though side-rolling, which is useful for the research of cold rolling and recrystallization annealing theory in the future.IF steel sheet was selected in this experiment and was treated with side-rolling under a series of different cold reduction at room temperature. The micro structure characters of IF steel sheets (include side-rolled IF steel and recrystallization annealed IF steel) was investigated though the optics microscope, the evolvement of the texture of the IF steel sheets after rolling and annealing was discuss by X-ray diffractometer.Results show that. (1) The orientation density of a-fiber texture increased obviously after normal-rolling. The orientation density of y-fiber texture increased too. A few texture components with low density(such as{111}<112>,{111}<123>)increased even more obviously after normal rolling. Typical y-fiber texture was formed. (2) In the case of 48% side rolling reduction, single{111}<112> texture was formed. It was strengthened with the increasing of side rolling reduction. When the side rolling reduction reaches 88%, typical a-andγ- fiber texture didn't form. The highest orientation density is located on{111}<110> orientation and{001}<110> orientation.respectively. When the side rolling reduction reaches 92%, typicalα-fiber texture didn't form, while y-fiber texture the orientation density of which was homogeneous was formed. (3) After side-rolling the typical<001>//ND orientation texture which include cube texture{001}<100> and rotated cube (001) [110] formed. (4) After side-rolled IF steel with 92% cold reduction annealed at 710℃for 5 min, y-fiber texture transformed into tradition recrystallization texture rapidly. Each ofγ-fiber texture components gathered alongγ- orientation to{111}<112> orientation. Typicalγ-fiber texture disappeared. (5) Only{001}<110> texture components which is one part ofα-fiber texture still appeared. The orientation density decreased rapidly with the increasing of annealing time. After annealing for 120min, a little of{112}<110> orientation which was included inα-orientations appeared. (6)<001>//ND fiber texture weakened with the increasing of annealing time, and disappeared after annealing for 120min.