Cold-Rolling and Recrystallization Textures of Low Carbon Steel Sheets

Abstract

The effect of solution-treatment of carbon and nitrogen prior to cold-rolling on the textures of low carbon steels was studied by magnetic torque and X-ray pole figure methods. The following results have been obtained:
(1) The harmonic coefficient a₄ of magnetic torque after cold-rolling always showed a positive value and increased with cold-rolling reduction by the development of the (100)[011]+(2\bar11)[011] texture. At the same cold-rolling reduction, no remarkable difference could be observed between the deformation texture of the rimmed steel and that of the killed steel.
Significant influence of the solution-treatment on the cold-rolling texture could not be observed in both steels.
(2) On annealing for 1 hr at 700°C, the coefficient a₄ decreased to a negative value and the maximum absolute value was obtained by the reduction of 70%. The absolute values of a₄ obtained on annealing the 50 and 70% rolled sheets were found to be raised by the solution-treatment prior to the cold-rolling. The (200) pole figures indicated that the total amount of (hk0)[001] type components was increased by the solution-treatment. The recrystallization texture of the 90% rolled sheets consisted of two main components of (111)[11\bar2] and (411)[148], which were not affected by the solution-treatment. As in the case of the cold-rolling texture, the recrystallization textures of the rimmed and killed steels were found to be almost the same.
(3) The variation of the recrystallization texture by the solution-treatment prior to cold-rolling may be interpreted by the change in the distribution of precipitates before the primary recrystallization, which has influence on the selective nucleation or growth of the recrystallized grains.