The Effects of Microstructure and Texture on Toughness of Control-rolled Steel Bars

Texture, microstructure and mechanical properties of low carbon microalloyed steel bars control-rolled in an oval/round process have been studied. Strength can be increased by decreasing rolling temperature without significant ductility loss. This can be explained in terms of microstructural refinement as well as ferrite work hardening by rolling in γ/α duplex phase region. Ductile/brittle transition temperature (VTS) in Charpy impact test is also remarkably decreased by lowering rolling temperature, e.g., VTS