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Correlation of the Solidification Path with As-Cast Microstructure and Precipitation of Ti,Nb(C,N) on a High-Temperature Processed Steel

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Abstract

The solidification path of a high-temperature processed (HTP) X65 sour service steel with 0.039 wt pct C, 0.09 wt pct Nb, and 0.54 wt pct Mn and its effect on the segregation, microstructure, and precipitation distribution of Ti,Nb(C,N) was studied using optical and confocal microscopy, scanning electron microscopy (SEM), and computational simulation (Thermo-Calc and DICTRA). The results were compared with those obtained for another commercial microalloyed steel, containing 0.09 wt pct C, 0.04 wt pct Nb, and 0.97 wt pct Mn. The results indicate that the main parameter that influences microsegregation is the C content, which has a large influence on the solidification path. The difference in segregation between different positions in industrial continuous cast slabs of the steels was also observed, as expected. The larger solidification interval (TL-TS) of the commercial microalloyed steel indicates the formation of a solidification front that has higher solute concentration than the X65 HTP sour service steel, which concurs with the higher macro- and microsegregation observed.

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Acknowledgments

The authors thank CBMM and Gerdau Ouro Branco for technical support during the development of this work and for providing the material for this study. ACS acknowledges the CNPq, CAPES, and FAPERJ support and MSA also thanks the CNPq institution for granting an academic scholarship.

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Authors and Affiliations

  1. SENAI Innovation Institute in Metallurgy and Special Alloys, Center for Innovation and Technology SENAI FIEMG, Av. José Cândido da Silveira, 2000 – Horto, Belo Horizonte, MG, Brazil

    D. Pérez Escobar, C. S. Batista Castro, E. Cavichioli Borba & M. Spangler Andrade

  2. Gerdau Ouro Branco, Ouro Branco, MG, Brazil

    A. P. Oliveira & K. Camey

  3. Companhia Brasileira de Metalurgia e Mineração (CBMM), Araxá, MG, Brazil

    E. Taiss

  4. Escola de Engenharia Industrial Metalúrgica de Volta Redonda – EEIMVR, Universidade Federal Fluminense – UFF, Volta Redonda, RJ, Brazil

    A. Costa e Silva

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  1. D. Pérez Escobar
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  2. C. S. Batista Castro
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  3. E. Cavichioli Borba
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  4. A. P. Oliveira
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  6. E. Taiss
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  7. A. Costa e Silva
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  8. M. Spangler Andrade
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Correspondence to D. Pérez Escobar.

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Manuscript submitted January 08, 2018.

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Escobar, D.P., Castro, C.S.B., Borba, E.C. et al. Correlation of the Solidification Path with As-Cast Microstructure and Precipitation of Ti,Nb(C,N) on a High-Temperature Processed Steel. Metall Mater Trans A 49, 3358–3372 (2018). https://doi.org/10.1007/s11661-018-4717-x

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