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

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 r...

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Bibliographic Details
Published in:Journal of materials science 2009, Vol.44 (1), p.293-299
Main Authors: Vasconcelos, Igor F., Tavares, Sérgio S. M., Reis, F. Evaristo U., Abreu, Hamilton F. G.
Format: Article
Language:English
Subjects:
Aging
Aging (metallurgy)
Characterization and Evaluation of Materials
Chemistry and Materials Science
Chromium
Classical Mechanics
Corrosion
Corrosion effects
Corrosion prevention
Corrosion resistance
Corrosion resistant steels
Crystallography and Scattering Methods
Ferritic stainless steels
Materials Science
Molybdenum
Mossbauer spectroscopy
Polymer Sciences
Solid Mechanics
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Summary: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.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-008-3064-5