Per: NATASHA NOGUEIRA DE MORAIS (CEFET-MG), ELAINE CARBALLO SIQUEIRA CORREA (CEFET-MG), WELLINGTON LOPES (CEFET-MG), Carlos ferreira da silva (cefet-mg), Adriene anita dos santos pimnta (cefet-mg)
Abstract:
Hot work tool steels are those used in tooling that work at high temperatures, reaching up to 500 ° C in operation. These steels are mainly applied in the manufacture of forging, extrusion and die castings. In this context, the objective of this work was to evaluate the mechanical behavior and microstructure of three different tool steels for hot work, AISI H13, AISI H11 and DIN 1.2367, subjected to different austenitization temperatures on quenching. The evaluation was carried out using the techniques of optical and scanning microscopy, as well as mechanical tests of hardness, impact and tensile test. The results showed that the increased temperature of austenitization in quenching promoted an increase in the hardness of the materials, due to the increase in the volumetric fraction of the martensite formed. In the Charpy impact tests the higher silicon content led to a lower level of energy absorbed by AISI H13 steel. In terms of tensile strength, for the three steels, it was observed an increase of the ultimate tensile strength and, in general, in the yield, with the increase of the austenitization temperature.