“…After intercritical heat treatments, the starting microstructure with ferrite + pearlite was coarse dispersed ferrite + martensite grains, while the starting microstructure with martensite was fine dispersed ferrite + martensite grains. Similar results were also reported by some researchers [17][18][19][20][21]. Average grain sizes of 22, 27, 23, 17, 14, 12 µm for the specimens 740C30, 780C50, 840C80, 760F30, 800F50, 840F80 were obtained, respectively.…”