Change in the Texture of Low Carbon Sheet Steel by Intercritical Annealing

Abstract

The effect of the volume fraction of γ phase on texture development has been investigated by making use of several extra low carbon sheet steels which were intercritically annealed in alpha plus gamma dual phase region. The results obtained are summarized in the following. (1) The texture with {111}component developed with increase in volume fraction of γ phase. The intensity of this compoment had two maxima; first at the γ fraction of less than 50% and second at the fraction of more than 60%. (2) The same behavior as (1) was obtained between the Lankford value and γ fraction. (3) The ratio of the {111} intensity of annealed sheet to that of cold rolled one was larger for a thinner specimen than for a thicker one, and also larger for surface layer than for midsection. (4) During slow cooling after intercritical annealing, {111} increased but {100} decreased in intensity. (5) In the residual α phase, {111} intensity increased with increase in γ fraction, and became maximum at 6090% γ phase transformed. (6) Those results were reasonably explained by the new theory on the formation mechanism of the α→γ→α transformation texture, which was proposed by the present authors.