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Microstructure–Property Correlation in High-Strength Formable Steel with Varying Nb-Si Content

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Abstract

High-strength formable quality (HSFQ) steel grades, steel A (0.038Nb, 0.031Si), steel B (0.034 Nb, 0.27Si), and steel C (0.044Nb, 0.26Si), with varying Nb and Si content has been investigated. The microstructure, texture, precipitation, mechanical properties and corrosion behavior of these steel grades have been explored. Very fine grain size in the range of 2.7-3.6 µm was obtained in all these steel grades through controlled hot rolling. However, a significant variation in the crystallographic texture and precipitation behavior in these steels was observed. A higher volume fraction of γ-fiber texture components and uniformly distributed fine Nb(C, N) precipitates were obtained in steel B as compared to steel A and C. This resulted in better properties in steel B with relatively high PSE (product of strength–elongation), high uniform elongation, and high hole expansion ratio. The corrosion properties of the steels were also evaluated, and steel B showed better corrosion resistance among the three grades. Considering the overall performance and properties of these steel grades, steel B with an optimum Nb and Si content is found to have better property and performance among the three grades.

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Acknowledgments

The authors are thankful to CSIR-NML, Jamshedpur and RDCIS-SAIL, Ranchi for facilitating the work.

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Authors and Affiliations

  1. Materials Engineering Division, CSIR-National Metallurgical Laboratory (NML), Jamshedpur, 831007, India

    Biraj Kumar Sahoo, Lalit Kumar Meena & Sandip Ghosh Chowdhury

  2. Research and Development Centre for Iron and Steel (RDCIS), Steel Authority of India Ltd (SAIL), Ranchi, Jharkhand, 834002, India

    Anjana Deva, Pratiksha Pandey & Bimal Kumar Jha

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  1. Biraj Kumar Sahoo
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  2. Anjana Deva
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  3. Pratiksha Pandey
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Correspondence to Biraj Kumar Sahoo.

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Sahoo, B.K., Deva, A., Pandey, P. et al. Microstructure–Property Correlation in High-Strength Formable Steel with Varying Nb-Si Content. J. of Materi Eng and Perform 29, 1901–1908 (2020). https://doi.org/10.1007/s11665-020-04675-3

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  • DOI: https://doi.org/10.1007/s11665-020-04675-3

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