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Thermodynamic Calculations for the Investigation of Phase Formation in Boron-Modified Ferritic Stainless Steel

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Abstract

Thermodynamic calculations in equilibrium condition were used to investigate the phase formation sequence and microstructure formation in a boron-modified ferritic stainless steel. The results were also compared with spray forming experimental heats. The thermodynamic calculations indicated that there is an eutectic point at around 1.1 wt.% B and therefore two different compositions (hypo and hypereutectic) were experimentally investigated. For the hypoeutectic composition, the primary phase to form from the melt was δ-ferrite with the boride phase M2B originating eutectically. Conversely, for the hypereutectic composition, the boride M2B was formed as the primary phase. The prediction of phase formation and stable phases at room temperature was accurate. The calculated melting temperatures showed considerable deviation from values measured by Differential Scanning Calorimetry. The final spray formed microstructure and the phase fractions were to some extent in accordance with the thermodynamic calculations.

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Acknowledgments

The authors would like to thank the Brazilian research funding agencies FAPESP (Thematic project, Grant Nos. 2013/05987-8 and 2014/27073-0), CNPq and CAPES for the financial support.

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Authors and Affiliations

  1. Programa de Pós-graduação em Ciência e Engenharia de Materiais (PPGCEM), Universidade Federal de São Carlos (UFSCar), Rodovia Washington Luís, km 235, São Carlos, SP, 13565-905, Brazil

    Thiago Pama Lopes

  2. Departamento de Engenharia de Materiais (DEMa), Universidade Federal de São Carlos (UFSCar), Rodovia Washington Luís, km 235, São Carlos, 13565-905, Brazil

    Juliano Soyama, Guilherme Zepon, Alexandre Romão Costa Nascimento, Claudio Shyinti Kiminami, Walter José Botta & Claudemiro Bolfarini

  3. VMT-Departamento de Engenharia Metalúrgica e Materiais, Escola de Engenharia Industrial Metalúrgica de Volta Redonda (UFF), Avenida dos Trabalhadores 420, Volta Redonda, 27255125, Brazil

    André Costa e Silva

Authors
  1. Thiago Pama Lopes
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  2. Juliano Soyama
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  3. Guilherme Zepon
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  4. Alexandre Romão Costa Nascimento
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  5. André Costa e Silva
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  6. Claudio Shyinti Kiminami
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  7. Walter José Botta
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  8. Claudemiro Bolfarini
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Corresponding author

Correspondence to Juliano Soyama.

Additional information

This article is an invited paper selected from presentations at TOFA 2016, the Discussion Meeting on Thermodynamics of Alloys, held September 4-9, 2016, in Santos, Brazil, and has been expanded from the original presentation.

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Lopes, T.P., Soyama, J., Zepon, G. et al. Thermodynamic Calculations for the Investigation of Phase Formation in Boron-Modified Ferritic Stainless Steel. J. Phase Equilib. Diffus. 38, 343–349 (2017). https://doi.org/10.1007/s11669-017-0550-y

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  • DOI: https://doi.org/10.1007/s11669-017-0550-y

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