Investigation of Thermomechanical Processing of Nb Microalloyed Steel Produced by Powder Metallurgy

One of the most important properties microalloyed steels is different microstructures which are obtained by changing thermomechanical processing parameters and steel composition. The control microstructure such as grain size, precipitates, dislocation structure inclusions highly effective to determine mechanical steels. strengthening can be done processesing due increase nucleation sides via maximizing austenite boundary density deformation band. In this study, unalloyed containing 0.15% Nb were produced powder metallurgy hot deformed reduce thickness 40% 75%. EDX analyzes, density, hardness size measurements also performed on specimens. According SEM results, gradually decreased with respect rate in both It was observed that small grains occurred a complete recrystallization process at 75% supported analysis. values increased rate. While microalloy under sintered conditions 89.46% 75 Hv, respectively, condition 98.51 % 231 Hv.