Análise da influência de diferentes tratamentos térmicos nas propriedades e no espaçamento entre as lamelas da perlita no aço SAE 1075.

Abstract

Steel has great relevance for the different sectors of the world, as its properties can be adjusted through thermo/mechanical processing and variations in its composition, which also makes them materials with wide application. This work aims to analyze the influence of isothermal heat treatment, under different isothermal temperatures, on the interlamellar spacing of pearlite formed in SAE 1075 steel. For this, qualitative analyzes of the micrographs recorded from the different samples were performed. In addition, it was seen what happens when the spheroidization heat treatment is performed, after the isothermal one, and its impact on the microstructure and properties of the material. It was also analyzed that this microstructural difference impacts on the mechanical properties of the material. Thus, Vickers Microhardness tests were carried out in order to analyze this impact. After such analyses, the relationship between these properties was identified, as it was seen that the higher the isothermal temperature used in the heat treatment, the greater the interlamellar spacing, and this causes a lower hardness to the material.