Alternative Strengthening Mechanisms for Interstitial Free (IF) Steels

摘要

On the basis of these preliminary studies, it can be concluded that: In the case of IF steels it might be difficult to produce ultra-fine grained material commercially, due to the narrow temperature of the austenite + ferrite phase field. A more promising path for stronger IF steels is the use of alloying to produce bainitic ferrite with high dislocation densities. The binary alloying of B + Nb produces a mixture of quasi-polygonal and bainitic ferrite, with a modest increase in strength effect. The ternary alloying of B + Nb + Mo exhibits the largest increase strength, with a bainitic ferrite structure that can be produced by a variety of processing paths.