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Influence of Austenitization Temperature on Tensile Properties and Impact Toughness of Niobium Micro-alloyed Carbide-Free Bainitic Steel

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Abstract

Carbide-free bainitic steels are known for their very high strength because of their fine nanoscale hard bainitic ferrite and inter-layer ductile retained austenite. The mechanical properties of these steels are influenced by the size, fraction, and morphology of constituent bainite and retained austenite phases. Prior austenite microstructure plays an important role in determining the morphology and volume fraction of bainite and retained austenite resulting from the austempering treatment. In the present study, mechanical properties of two high-carbon, high-silicon, carbide-free bainitic steels with and without niobium addition austenitized at three different temperatures (900 °C, 970 °C, and 1050 °C) and austempered at 300 °C for 12 h are reported. Both the steels show a decrease in total elongation and Charpy V-notch impact toughness with increasing austenitization temperature. Niobium addition significantly refines the prior austenitic grain size at any given austenitization temperature, which improves total elongation and Charpy V-notch impact toughness.

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Acknowledgements

The authors would like to thank Director, DMRL for granting permission to publish this paper. The authors wish to thank DRDO for funding this work.

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Authors and Affiliations

  1. Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad, 500058, India

    P. Ponguru Senthil, G. Sukumar, R. Chandana & B. Bhav Singh

  2. National Institute of Technology, Warangal, Warangal, 506004, India

    Ekansh Singh & C. Vanitha

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  1. P. Ponguru Senthil
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  2. Ekansh Singh
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  3. G. Sukumar
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  4. R. Chandana
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Correspondence to P. Ponguru Senthil.

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Senthil, P.P., Singh, E., Sukumar, G. et al. Influence of Austenitization Temperature on Tensile Properties and Impact Toughness of Niobium Micro-alloyed Carbide-Free Bainitic Steel. Trans Indian Inst Met 77, 543–552 (2024). https://doi.org/10.1007/s12666-023-03115-9

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