The texture development in the Nb-microalloyed steels as an effect of intercritical rolling

摘要

Thermomechanical processing strongly affects the microstructure components and the resultant mechanical properties of final product. In the case of intercritical rolling, the possible texture development can be used as an additional factor that reflects the materials behavior. Therefore, the influence of the process parameters on the evolution of texture has been analyzed. The phenomena that have been taken into account are deformation temperature, strain rate and amount of accumulated strain. As an example, the niobium-microalloyed steel was investigated. The texture index is employed in present work as a quantitative value describing the intensity of the texture. It is concluded that the principle reason for increasing texture index in ferrite is inherent texture of hardened or recrystallized austenite at higher deformation temperatures, and in the case of rolling in the two-phase region the inherent texture, strengthened by the deformation texture. The obtained results establish a methodology for the possible development of structural steels with both controlled microstructure and texture.