Abstract Scope |
In the present work, the mechanical properties of Fe-based medium entropy alloy printed by laser-based direct energy deposition (DED) method have been investigated in room and cryogenic environments. Besides, the impact of in situ precipitation, formed during DED, on the mechanical property was inspected. Therefore, the as-print sample has a dual-phase heterogeneous microstructure of austenite and martensite decorated by cellular structures and nano-precipitates. The corresponding MEA revealed acceptable ultimate tensile properties and total elongation and exceptional cryogenic mechanical properties, as compared to the present additive manufactured HEAs/MEAs. The improved tensile properties of the corresponding additive manufactured MEA, in comparison with the present literature, are due to the co-activation of solid solution strengthening, dislocation-mediated plasticity, hetero deformation-induced strengthening, deformation-induced martensitic phase transformation, and precipitation strengthening. The present results can expand the possibilities for developing ferrous MEAs/HEAs to overcome the strength and toughness trade-off in severe conditions. |