Abstract
An aging method assisted by electric current was applied to a Fe-18Mn-9Al-1C (wt.%) low-density steel. It improves the microstructure and therefore significantly increases both the yield strength and ductility of the steel. This current-assisted aging method can increase the yield strength by 178 MPa and elongation by 1.16 times in only 0.5 min at 450 °C. However, the yield strength is increased only 90 MPa by the traditional aging method (heat conduction) at 450 °C for 180 min, and the elongation is even decreased from 42.0% to 31.6%. The obvious improvement in yield strength by the current-assisted aging for a short time is resulted from the fact that the current-assisted aging promotes a rapid precipitation of nano-scale κ-carbides in γ-austenite by reducing the thermodynamic barrier and accelerating the atomic diffusion. This work demonstrates that this current-assisted aging method is significantly time saving and cost-effective for low-density steels, with potential for various industrial applications.
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