  A steel with nominal composition Fe-28Mn-8Al-1.0C in mass percent was hot
rolled at two temperatures, 1100 \degree C and 850 \degree C and subsequently
aged at 550 \degree C for 24 h. The lower temperature rolling resulted in a
yield strength increment of 299 MPa while still retaining an elongation to
failure of over 30\%. The large improvement in strength was attributed to an
increase in residual dislocation density which was retained even after the
ageing heat treatment. A homogeneous precipitation of $\kappa$-carbides in both
samples also showed that the high residual dislocation density did not
adversely affect precipitation kinetics. These findings demonstrate that the
tensile properties of this class of steel can yet be improved by optimising hot
rolling process parameters.
