Estudo sistemático da influência dos elementos C-Mn-Al sobre a formação de austenita retida em aços médio manganês

Abstract

The TRIP (Transformation induced plasticity steels with a high strength and good ductility are the key to the construction of lighter weight engines, with greater capacity to reduce fuel consumption, CO2 emission reduction, complex designers and greater safety for passengers. The present work evaluated 8 medium steels with different compositions of manganese, carbon and aluminum, in which were tested in dilatometer by applying different thermal cycles. This results, make possible to find an influence of different compositions on the phase transformation temperatures Ac1, Ac3, Ms and Mf. After the dilatometry tests, a structural microstructure of each sample was performed, and a corresponding hardness was determined. The results of the research show that increasing the concentration of manganese reduce of temperatures Ac1, Ac3, Ms and Mf, but increase hardness. When increase the aluminum, do not have an influence in Ac1, Ms and Mf, however, reduces the temperature of Ac3 and hardness.