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Characterisation of microstructure, texture and mechanical properties in ultra low-carbon Ti-B microalloyed steels

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Abstract

In the present study, thermo-mechanical controlled processing followed by water quenching has been utilised to produce ultra low-carbon microalloyed steel in a laboratory scale. The variation in microstructure and corresponding mechanical properties at the selected range of finish rolling temperatures (FRT), (850–750 °C) has been evaluated. The microstructures of the steels consisted of polygonal ferrite, acicular ferrite as well as granular bainite with the average ferrite grain sizes less than 5 μm. Finish rolling at 850°C produced weak texture. α-fibre and γ-fibre intensified with the decrease in finish rolling temperature to 800°C. Intensities of the beneficial texture components such as, {554}<225> and {332}<113> also reached the highest value at 800°C. Ferrite deformation texture i.e. α-fibre dominated at 750°C FRT. The characteristic ferrite — bainite microstructure with fine ferrite grain size and uniform distribution of fine TiC particles (< 50 nm) resulted in high yield strength (405–507MPa), moderate tensile strength (515–586 MPa) and high total elongation (19–22%) for the selected range of finish rolling temperatures. Fairly good impact toughness value in the range of 63–74J was obtained at subzero temperature (−40 °C) in the sub-size sample. The above strength — ductility — toughness combination boosts the potentiality of developed steel for the pipeline application.

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Authors and Affiliations

  1. Research & Development Centre for Iron & Steel, SAIL, Ranchi, 834 002, India

    R. Shukla

  2. Department of Metallurgy and Materials Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah, 711 103, India

    S. K. Ghosh & S. Chatterjee

  3. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721 302, India

    D. Chakrabarti

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  1. R. Shukla
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  2. S. K. Ghosh
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  3. D. Chakrabarti
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  4. S. Chatterjee
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Correspondence to S. K. Ghosh.

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Shukla, R., Ghosh, S.K., Chakrabarti, D. et al. Characterisation of microstructure, texture and mechanical properties in ultra low-carbon Ti-B microalloyed steels. Met. Mater. Int. 21, 85–95 (2015). https://doi.org/10.1007/s12540-015-1010-z

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  • DOI: https://doi.org/10.1007/s12540-015-1010-z

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