Análisis y evaluación de las propiedades microestructurales del acero naval Astm A-131, sometido a prueba de impacto, con tratamiento de temple a temperaturas intercriticas y un revenido A 550 ºc

Abstract

This investigation has like main objective to analyze the influence of the tempering and tempering thermal treatments to certain temperatures, to carry out analysis of hardness, microhardness, impact tests and metallographic study, besides to determine the relationship of this change with the mechanical properties of the naval steel astm a-131. To achieve this achievement, tempering heat treatments will be performed using an austenitizing temperature, a holding time and a cooling medium. Afterwards, treatment will be carried out using a high temperature and three times of maintenance. Measures of tenacity and maximum resistance will also be made. The chemical composition was studied using optical emission spectroscopy (oes), the microstructure will be performed by scanning electron microscopy (sem). To demonstrate the comparative analysis will be manufactured 18 test tubes of which 3 will be left untreated thermally, then the remaining machining material will be made a temper and will be left 3 of these for the comparative analysis and finally the remaining probes will be applied a restored at 550 ºc at different times (5, 10, 15, 30) leaving 3 samples for each time. With the above, it is desired to perform a study of microhardness and metallographic analysis in search of martensite in its crystalline structure, all these results in classification will be used to observe the mechanical properties acquired by a shipyard steel astm a131, after the entire process.