Caracterização microestrutural e análise da influência do tamanho de grão em um aço microligado ao vanádio

Abstract

The vanadium micro alloyed steel is commonly used in the manufacture of rebars for civil construction with its use in reinforced concrete, such application requires of the material high mechanical properties The use of vanadium in steels has been used in order to obtain improvements in these required mechanical properties, having as agent of this phenomenon the strengthening mechanisms that vanadium promotes in steels, such as precipitation hardening and grain ref inement Such mechanisms are result s of the formation of vanadium carbonitrides during the hot rolling process, where the rolling temperatures have a huge influence on their constitution. In this paper, we will analyze in each reduction of the rolling process the influence that the grain si ze has on a SAE 1536 vanadium micro alloyed carbon steel. Applying microstructural characterization, we will correlate the changes in the average grain size and the microhardness, visualizing in each stage of the process the evolution of the microstructure and its mechanical behavior.