Controlling the grain size of steels is an effective way for tailoring their mechanical properties, such as yield strength, impact toughness, and ductility. In this study, a new industrial thermomechanical treatment was applied to low-alloyed TRIP-assisted bainitic steel 13MnSiCr7 achieve substantial microstructural refinement. average micro-bainitic decreased from ∼25 μm ∼5 μm. Fatigue tests w...