Análise da microestrutura e das propriedades mecânicas do vergalhão CA-50 em diferentes estados de tratamento térmico

Abstract

Due the fast growth of civil construction and the high consumption of metal products in this area, more and more are sought in these materials, properties that meet the diverse needs of market. The microstructural knowledge of these materials and your microstructural manipulation by use of heat treatment, it is extremely important to ensure safety in the development of new buildings. To analyze and understand the changes that heat treatments can offer, was used as research material, CA-50 rebars, as this is the most common in the current national market, and the study of their properties was conducted and its microstructure in three different states: as received, quenched in water and annealed in the oven. The properties and characteristics of the three states were compared and analyzed using optical microscopy, scanning electron microscopy, tensile and hardness tests, aiming to understand the relationship between the microstructural changes introduced by heat treatment process and the resultant mechanical properties. Analysis by optical microscopy was used with the objective of determining phases and constituents present in different states. The analysis by electron microscopy was to emphasis the study of fracture after the tensile test. The results were in agreement with those expected in terms of properties and microstructure than there are on literature.