LAUSR

The high strength low alloy steel (HSLA) with enhanced mechanical properties is commonly applied as structural steel in architectural building,1) automobile,2) energy transportation,3) etc. To satisfy the increasingly complicated structure, such as large-span, light-weight and long-distance, and to reduce the heavy environmental pressure and huge waste of energy resources, structural steel currently tends to be high strengthened, accompanying with good ductility and toughness.4–7) For purpose of improving mechanical properties, the microalloying technology combined with thermomechanical controlled process (TMCP) is frequently applied to absolutely realize the synergistic mechanism of precipitation strengthening, grain refinement, dislocation strengthening and so on.8–12) The microalloy element of Nb, V, Ti, Mo, etc., is commonly added into the low carbon steel individually or in combination to form carbide and/or carbonitride precipitates which significantly influence the final microstructure and mechanical properties.13–18) Among them, V combined with Effect of the Simulated and Pilot-scaled Thermomechanical Processes on the Microstructure, Precipitates and Mechanical Properties of V–N Alloyed Steel