Continuous Annealing of a Fe/0.1C/0.45Si/0.05Nb/0.1Mo Dual-Phase Steel

摘要

Several two-phase annealing heat treatments have been performed on a Nb and Mo microalloyed low-carbon steel. Continuous intercritical annealing followed by water quenching produces a coarse ferrite-martensite structure that has the highest tensile strength of all heat treatments utilized. The high strength arises from a combination of the dispersion hardening which occurs in ferrite and the presence of martensite. It is concluded that the ferrite-forming elements Nb and Mo do not benefit hardenability in this steel for dual phase heat treatment, in thicknesses approx. 5 mm. (ERA citation 08:046762)