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Microstructure and Mechanical Properties of V-Nb Microalloyed Ultrafine-Grained Dual-Phase Steels Processed Through Severe Cold Rolling and Intercritical Annealing

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Abstract

Ultrafine-grained (UFG) dual-phase (DP) steel was produced by severe cold rolling (true strain of 2.4) and intercritical annealing of a low carbon V-Nb microalloyed steel in a temperature range of 1003 K to 1033 K (730 °C to 760 °C) for 2 minutes, and water quenching. The microstructure of UFG DP steels consisted of polygonal ferrite matrix with homogeneously distributed martensite islands (both of size <1 µm) and a small fraction of the inter lath films of retained austenite. The UFG DP steel produced through intercritical annealing at 1013 K (740 °C) has good combination of strength (1295 MPa) and ductility (uniform elongation, 13 pct). The nanoscale V- and Nb-based carbides/carbonitrides and spheroidized cementite particles have played a crucial role in achieving UFG DP microstructure and in improving the strength and work hardening. Analysis of work hardening behavior of the UFG DP steels through modified Crussard–Jaoul analysis showed a continuously varying work hardening rate response which could be approximated by 2 or 3 linear regimes. The transmission electron microscopy analysis on post tensile-tested samples indicated that these regimes are possibly related to the work hardening of ferrite, lath, and twin martensite, respectively.

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Acknowledgments

The authors acknowledge the financial support of DST, Govt. of India through a sponsored project for the above research work. They are also thankful to Dr. Arnab Chattopadhyay formerly with TATA Steel, Jamshedpur, India for gifting the V-Nb microalloyed steels for the research work.

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  1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600036, India

    M. Papa Rao, V. Subramanya Sarma & S. Sankaran

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  1. M. Papa Rao
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  2. V. Subramanya Sarma
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  3. S. Sankaran
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Correspondence to S. Sankaran.

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Manuscript submitted November 1, 2015.

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Papa Rao, M., Subramanya Sarma, V. & Sankaran, S. Microstructure and Mechanical Properties of V-Nb Microalloyed Ultrafine-Grained Dual-Phase Steels Processed Through Severe Cold Rolling and Intercritical Annealing. Metall Mater Trans A 48, 1176–1188 (2017). https://doi.org/10.1007/s11661-016-3889-5

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