Improvement of the creep resistance of FeAl-based alloys

By increasing the concentration of carbon or transition metals, the creep resistance of a Fe–40Al–0.2Mo–0.05 Zr–0.5Ti–0.2C–0.02B (at.%) alloy was significantly improved with the minimum creep rate decreasing by the order of three. The improvement was attributed to precipitation hardening and solid solution hardening. The influence of precipitation hardening and solid solution hardening on the creep behavior of FeAl-based alloys was analyzed. Formation of grain boundary microcracks and the microstructual instability are likely to be the concerns for FeAl-based alloy during long-term creep.