Influência de microligantes em aços obtidos via TMCP

Abstract

Through controlled thermomechanical forming followed by accelerated cooling, TMCP, together with the addition of alloying elements such as niobium, titanium, and vanadium in micro alloy contents, it is possible to obtain a morphology predominantly composed of acicular ferrite or fine bainite, thus resulting in low-alloy steels with similar properties to that of high-alloy steels. By determining the T5% (temperature where only 5% of the structure recrystallizes) and the austenitization temperature, it is possible to define the lower and upper limits of work during rolling. By analyzing time, temperature precipitation – TTP, and continuous cooling transformation – CCT graphs, it is possible to understand precipitation phenomena during controlled rolling and define trends for accelerated cooling. By understanding these parameters, choosing a path for the treatment of TMCP becomes possible.