Implicaciones del contenido total de silicio, aluminio, cromo y formación de películas delgadas de ferrita sobre la baja ductilidad a alta temperatura en aceros eléctricos no orientados

This work shows evidence of the implications of total additions of silicon, aluminium and chromium on low ductility during hot rolling in non-oriented electrical steels. This paper explains the reason of ductility loss at temperatures between 950 - 1000 ° C in electrical steels which exhibit higher Ar 3 transformation temperature than C-Mn and microalloyed steels. The empirical equations to determine Ar 3 temperature do not consider silicon and aluminium elements. The results show that high content of silicon, aluminium and residual concentration of chromiun considerably increases Ar 3 transformation temperature in non-oriented electrical steels. The low ductility at high temperature occurs between Ae 3 and Ar 3 transformation temperatures. In addition, the results of this work show evidence of thin ferrite films formed near Ar 3 temperature and their implications on ductility loss at high temperature.