Nano-sized precipitation and properties of a low carbon niobium micro-alloyed bainitic steel

The present work focuses on microstructure evolution and precipitation strengthening during tempering at region of 550–680°C to elucidate the structure–property relationship in the steel. The effect of tempering on the development of a 700MPa grade high strength hot rolled cost-effective bainitic steel was studied for infrastructure applications. Granular bainite with dispersed martenisit–austenite (M–A) constituents in the bainitic ferrite …