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Ageing effects on α′ precipitation and resistance to corrosion of a novel Cr–Mo stainless steel with high Mo content

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Abstract

The consequences of ageing at 400 and 475 °C on α′ precipitation and corrosion resistance of a novel Cr–Mo ferritic SS with high Mo content were investigated. Combination of X-ray diffraction and Mössbauer spectroscopy results indicates the appearance of a small amount of a paramagnetic phase as a result of the ageing. This phase is iso-structural with the α phase and is thus associated with a Cr-rich α′ phase. The appearance of this phase is related to a decrease of the resistance to corrosion as studied by DL-EPR because the presence of this paramagnetic phase leads to discontinuities in the oxide layer thus reducing corrosion protection and exposing the steel to the action of the corrosive solution.

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Acknowledgements

The authors are grateful to the Brazilian research agencies Fundação Cearense de Apoio ao Desenvolvimento Científico e Tecnológico (FUNCAP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); and Agência Nacional de Petróleo (ANP) for financial support, and to Prof. Pedro de Lima Neto for DL-EPR measurements.

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Authors and Affiliations

  1. Dep. Eng. Metalúrgica e de Materiais, Universidade Federal do Ceará, Campus do Pici Bloco 714, 60455-760, Fortaleza, CE, Brazil

    Igor F. Vasconcelos, F. Evaristo U. Reis & Hamilton F. G. Abreu

  2. Dep. Eng. Mecânica, Universidade Federal Fluminense, Niteroi, Brazil

    Sérgio S. M. Tavares

Authors
  1. Igor F. Vasconcelos
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  2. Sérgio S. M. Tavares
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  3. F. Evaristo U. Reis
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  4. Hamilton F. G. Abreu
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Correspondence to Igor F. Vasconcelos.

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Vasconcelos, I.F., Tavares, S.S.M., Reis, F.E.U. et al. Ageing effects on α′ precipitation and resistance to corrosion of a novel Cr–Mo stainless steel with high Mo content. J Mater Sci 44, 293–299 (2009). https://doi.org/10.1007/s10853-008-3064-5

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  • DOI: https://doi.org/10.1007/s10853-008-3064-5

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