Controlled warm working: Possible tool for optimizing stored energy advantage in deformed γ-fiber (ND//(111))

Abstract

In the present study, ultra low carbon steel samples were deformed in near plane-strain mode with different strains, strain rates and temperatures. Estimates of in-grain misorientation developments were obtained respectively for the γ-fiber (ND//(111)) and α-fiber (RD//(110)) oriented deformed grains. Though a general drop in in-grain misorientation was observed with increase in deformation temperature, the highest reduction of 70% showed a clear increase at the intermediate deformation temperatures. Under these condi-tion(s), the misorientation increase in deformed γ-fiber grains was more substantial than in α-fiber grains. The phenomenon was related to the preferred appearance of grain interior strain localizations. The study brings out a clear possibility of optimizing the stored energy advantage in the deformed γ-fiber through controlled warm working. © 2009 ISIJ.