Effect of annealing treatment on microstructures and properties of austenite-based Fe-28Mn-9Al-0.8C lightweight steel with addition of Cu

The mechanical properties of an austenite-based Fe-Mn-Al-C lightweight steel were improved by co-precipitation nanoscale Cu-rich and ?-carbide particles. Fe-28Mn-9Al-0.8C-(0,3)Cu (wt.%) strips near-rapidly solidified annealed in the temperature range from 500 °C to 700 °C. microstructure evolution under different annealing processes studied. Microstructural analysis reveals that ?-carbides particles precipitate austenite ferrite this range. Co-precipitation provides obvious increment yield strength. At 600 °C, both strength ultimate tensile Fe-28Mn-9Al-0.8C-3Cu strip are highest. total elongation is 25%, which obviously higher than Cu-free strips, for addition Cu reduces large sized precipitated along austenite/ferrite interfaces. When rises ductility two deteriorate due formation massive intergranular It can be concluded a proper would improve steel.