1. Professor, Dept. of Metallurgical Engineering, Instituto Federal do Espírito Santo, 29040780 Vitória, Brazil (corresponding author).
2. Professor, Reference Center for Distance Education and Training, Instituto Federal do Espírito Santo, 29040780 Vitória, Brazil.
3. Professor, Dept. of Metallurgical Engineering, Instituto Federal do Espírito Santo, 29040780 Vitória, Brazil.