Morphological and crystallographic features of granular and lath-like bainite in a low carbon microalloyed steel

In this work, different heat treatments were performed in order to study two bainite morphologies, granular and lath-like, obtained at cooling rates a low carbon microalloyed steel. For that purpose, advanced crystallographic characterization quantitative metallography using SEM, EBSD TEM carried out. The evolution of the volume percentage, size, aspect ratio, retained austenite percentage crystallography M/A constituents was studied as function rate classified according machine learning algorithm. morphology bainitic ferrite matrix, microstructures selected representative lath-like bainite. results show main differences between are size shape constituents, change progressively from mixture large grains, coarse blocks fine roughly equiaxed grains short long films high rates. morphological both can be explained based on driving force amount formed temperature ranges. These confirm mechanisms by which forms not transformation