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Influence of Mo content on the phase evolution and corrosion behavior of model Fe–9Cr–xMo (x = 5, 7, and 9 wt%) alloys

Published online by Cambridge University Press:  05 June 2015

Marcelo J. Gomes da Silva Open the ORCID record for Marcelo J. Gomes da Silva [Opens in a new window] ,
Luis F.G. Herculano ,
Amanda S.C. Urcezino ,
Walney S. Araújo ,
Hamilton F.G. de Abreu  and
Pedro de Lima-Neto
Marcelo J. Gomes da Silva*
Affiliation:
Departamento de Engenharia Metalúrgica e Materiais, Centro de Tecnologia, Universidade Federal do Ceará Campus do Pici, bloco 729, Fortaleza 60440-900, Ceará, Brazil
Luis F.G. Herculano
Affiliation:
Departamento de Engenharia Metalúrgica e Materiais, Centro de Tecnologia, Universidade Federal do Ceará Campus do Pici, bloco 729, Fortaleza 60440-900, Ceará, Brazil
Amanda S.C. Urcezino
Affiliation:
Departamento de Química Analítica e Físico Química, Centro de Ciências, Universidade Federal do Ceará, Campus do Pici, bloco 940, Fortaleza 60440-900, Ceará, Brazil
Walney S. Araújo
Affiliation:
Departamento de Engenharia Metalúrgica e Materiais, Centro de Tecnologia, Universidade Federal do Ceará Campus do Pici, bloco 729, Fortaleza 60440-900, Ceará, Brazil
Hamilton F.G. de Abreu
Affiliation:
Departamento de Engenharia Metalúrgica e Materiais, Centro de Tecnologia, Universidade Federal do Ceará Campus do Pici, bloco 729, Fortaleza 60440-900, Ceará, Brazil
Pedro de Lima-Neto
Affiliation:
Departamento de Química Analítica e Físico Química, Centro de Ciências, Universidade Federal do Ceará, Campus do Pici, bloco 940, Fortaleza 60440-900, Ceará, Brazil
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Model Fe–9Cr–xMo alloys with high Mo content alloys were cast to investigate the effect of Mo on the phase evolution and properties of the alloys. The Mo contents in the alloys were 5, 7, and 9 wt%, while the Cr content was held constant at 9 wt%. For comparison, a commercial A213T 9-P9 (Fe–9Cr–1Mo) alloy, widely used in the petrochemical industry, was also investigated. The alloys were heat-treated at temperatures between 450 and 650 °C and characterized by scanning electron microscopy, x-ray dispersive energy spectroscopy, and electron backscatter diffraction. Potentiodynamic linear polarization technique was used to evaluate the corrosion of the alloys in a 0.5 mol L−1 H2SO4 solution containing 0.1 mol L−1 NaCl. The results showed that the corrosion resistance of the alloys was affected by precipitation of the µ phase and that the Mo content in excess of 5% is deleterious to the corrosion resistance of the Fe–Cr–Mo alloys.

Keywords

corrosionFe–Cr–Mo alloycharacterizationphase transformation
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 12 , 28 June 2015 , pp. 1999 - 2007
Copyright
Copyright © Materials Research Society 2015 

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