The transition from interphase-precipitated carbides to fibrous carbides in a vanadium-containing medium-carbon steel

 The precipitation of vanadium carbides in idiomorphic ferrite, which was deliberately produced at a large prior austenite grain-sized condition, in a vanadium-containing medium-carbon steel has been investigated. Transmission electron microscopy reveals that in the idiomorphic ferrite matrix, the interphase-precipitated carbides can be intimately connected with the fibrous carbides. Through the analysis of orientation relationships, the correlation between these two precipitation modes has been proposed.