Efeitos de tratamento térmicos na dureza e microestrutura dos aços Sae 4140 e Sae 4340

Abstract

Since the properties of a material can be altered by means of heat treatments and addition of other substances in the common carbon steels. Giving origin to the famous alloy steels, which with the addition of these alloying elements, improve its mechanical, magnetic, thermal properties and other benefits, such as corrosion resistance. This paper proposes to study two of these alloys, SAE 4140 and SAE 4340, with emphasis on the mechanical properties of hardness and their relationship with the microstructure caused by the standard annealing, annealing and quenching treatments. The two alloys were then heated to an austenitization temperature of 850 ° C and each sample of the alloys was cooled with different cooling rates. Based on the Rockwell C hardness tests and the observations of the microstructure of the alloys, we can verify their relationship, as it is known in the literature