Influence of the Addition of Ni on as-Cast Microstructure of Duplex Fe-Mn-Al-C Lightweight Steel

Lightweight Fe-Mn-Al-C steels have low density, and high mechanical properties, which makes them a possibility for weight reduction in vehicles road transport. In steel production, as-cast microstructure is an important parameter further processing. The of five lightweight duplex was investigated: Fe-15Mn-10Al-0.8C, Fe-15Mn-10Al-1.7Ni-0.8C, Fe-15Mn-10Al-3.9Ni-0.8C, Fe-15Mn-10Al-5.6Ni-0.8C Fe-15Mn-10Al-8.6Ni-0.8C. influence Ni analysed through thermodynamic calculations microstructural characterization. samples were optical electron microscopy. base the studied consists ferrite austenite. Further investigation showed that decomposition austenite accompanied by formation kappa carbides B2 ordered phase. addition prevented lamellar morphology, but at 5.6 wt.% Ni, most severe, resulting large amount