Abstract
Single stage quench partitioning was carried out on a lean alloyed low carbon 0.17C–1.35Si–1.72Mn–0.04Ti–0.02Nb (wt.%) hot rolled steel. The steel was austentitized at 790, 810, 830 and 900 °C, and quenched to a temperature where the residual austenite fraction was maintained at 20, 40 and 80% based on Koinstein–Maurberger equation. The primary martensite formed at first stage in salt bath quench partitioning resulted in carbon rich austenite, which on quenching to room temperature promoted secondary martensite and final carbon-rich austenite. The actual phase constituents significantly differed from the predicted phase fraction. The range of tensile strengths, elongations, yield ratios and work hardening exponents for the steel was obtained to be 850 to 1240 MPa, 14–27%, 0.5–0.78, 0.06–0.18, respectively. The product of strength and ductility exceeded 20 GPa.% meeting the requirement of third generation advanced high strength steel.
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Mohapatra, J.N., Dabbiru, S.K. & Balachandran, G. Development of Ultra-high Strength Steel with a Versatile Range of Properties by Single Stage Quench Partitioning Process. Trans Indian Inst Met 76, 1905–1913 (2023). https://doi.org/10.1007/s12666-023-02901-9
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DOI: https://doi.org/10.1007/s12666-023-02901-9