Estudo do comportamento mecânico de vergalhões de aço SAE 1018 submetidos a ensaios de tração em diferentes temperaturas.

Abstract

Steel rebars play a crucial role in civil construction, being used as structural elements in reinforced concrete to bear loads and ensure the stability of structures. Tensile tests on these materials allow for the evaluation of their strength and behavior under tension. However, there is a significant lack of studies exploring the mechanical properties of rebars at temperatures other than room temperature, which can significantly impact the mechanical properties of steel. In this context, tensile tests at different temperatures enable the assessment of changes in mechanical properties to ensure the safety and durability of structures. This study aims to investigate the mechanical behavior of SAE 1018 steel rebars when subjected to tensile tests at different temperatures, as well as the performance of microstructural, fractographic, and microhardness analyses. Thus, this work seeks to fill this gap by conducting tensile tests at different temperatures and analyzing the microstructure of the rebars. From the obtained data, it was observed that the maximum stress gradually decreases with the increase in temperature, while the plastic deformation of the rebars increased. Additionally, there was grain growth, which reduced the material hardness, facilitating its deformation. Furthermore, it was found that the material exhibited ductile fracture at all temperatures.