Análise de textura cristalográfica por difração de raios X em aços IF com diferentes adições de titânio, nióbio e fósforo

Abstract

Interstitial free steels (IF steels) find wide application in the automotive industry, due to their excellent drawability. The crystallographic texture developed during the rolling of IF steels plays a fundamental role in the formability of the rolled sheets, being desirable the development of a strong gama fiber and weak alfa fiber. In this work, three types of IF steels with different additions of titanium, niobium and phosphorus were subjected to crystallographic texture analysis by x-ray diffraction, in order to evaluate the impact of the thermomechanical treatments performed and the variation of chemical composition in the crystallographic orientations formed. The textures were analyzed using orientation distribution functions (ODF). The results of the ODF sections were compared to previously obtained values for the normal and planar anisotropy coefficients of these same steels. The texture in the rolled samples did indeed show increased gama fiber and partial alfa fiber. The IF-TiNbP steel presented the best texture for deep drawing. However, Goss component was observed on the surface of this same steel.