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High yield strength (710–862 MPa) ferritic microalloyed steels are developed through the combined contribution of Nb, Mo, V, and Cr microalloying and controlled thermomechanical treatment. Microstructures and mechanical properties are characterized using advanced microscopy techniques and uniaxial tensile testing. NbV carbonitrides with/without Mo (depending on steel composition) are formed in austenite and range from 30 to 70 nm in average diameter. However, V- and Cr-rich interphase (3–7 nm range) and random (1–6 nm range) precipitates are found in polygonal ferrite. An increase in rou...

Abstract Novel steel microalloyed with 0.73 (Cr + V + Nb) has been subjected to thermomechanical processing (TMP) with varying parameters to simultaneously maximise the steel strength and ductility. Optical and electron microscopy studies coupled with uniaxial tensile testing were carried out to analyse the processing-microstructure-properties relationship. For the suggested steel composition, the simultaneously highest yield stress (960 MPa), ultimate tensile strength (1100 MPa), and elongation to failure (25%) were achieved following simulated coiling at 650 C and holding for 30 min. The va...