A. Sarkar, T. Bandyopadhyay
Mar 1, 2015
Journal name not available for this finding
Mn based steels have shown promise for automotive application but however very limited research was conducted in medium Mn range that is aimed at enhancing the mechanical properties through microstructural control. Till now, it has been reported that both high and low Mn steel are undesirable for automotive application. Thus two different steel composition characterized as Fe-0.62C-13.64Mn-4.24Al-2.29Si, (S-1) and Fe-0.54C-8.36Mn-5.24Al-1.72Si, (S-2) produced by melting-casting route, have further been mechanically worked and heat-treated to obtain the desired microstructure. Microstructural analysis reveals austenite as the major phase along with martensite after quenching and tempering heat treatment. The steel containing higher Mn with low stacking fault energy results in hexagonally closed packed є-martensite formation where as the steel containing lower Mn with relatively higher stacking fault energy results in body centered tetragonal α-martensite formation.