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Subsurface microstructural changes of alloy 625 related to oxidation at 900 °C in lab air and humid air.

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Title: Subsurface microstructural changes of alloy 625 related to oxidation at 900 °C in lab air and humid air.
Authors: Jacquard, B.1,2 (AUTHOR) bruno.jacquard@univ-lorraine.fr, Mathieu, S.1 (AUTHOR) stephane.mathieu@univ-lorraine.fr, Steciuk, G.1 (AUTHOR) gwladys.steciuk@univ-lorraine.fr, Migot, S.1 (AUTHOR) sylvie.migot@univ-lorraine.fr, Bonina, D.1 (AUTHOR) david.bonina@univ-lorraine.fr, Perez, T.3 (AUTHOR) thomas.perez@safrangroup.com, Epifano, E.4 (AUTHOR) enrica.epifano@toulouse-inp.fr, Monceau, D.4 (AUTHOR) daniel.monceau@toulouse-inp.fr, Vande Put, A.4 (AUTHOR) aurelie.vandeput@ensiacet.fr
Source: Corrosion Science. Jul2026, Vol. 267, pN.PAG-N.PAG. 1p.
Subjects: Oxidation, Precipitation (Chemistry), Chemical decomposition, Molybdenum oxides, Kirkendall effect
Abstract: Alloy 625 was oxidized at 900 °C in lab air and in air + 20%vol. H 2 O for 400 h to estimate the microstructural changes experienced by the alloy during exposure at high temperature. The specimen mass loss in air + 20%vol. H 2 O evolved linearly after a very short period of exposure due to the formation of volatile species from the protective Cr 2 O 3 layer. The chromium loss rate was in the order of 5.5 × 10−7 mg.cm-2.s-1 (evaluated by direct mass variation measurements) and 7.5 × 10−7 mg.cm-2.s-1 (evaluated from Cr-mass balance) in air + 20%vol. H 2 O in the present conditions. Pronounced chemical and microstructural changes were observed in the subsurface for samples exposed in air + 20%vol. H2O. The recession of the alloy interface due to chromium removal was insufficient to explain the pronounced accumulation of δ-Ni 3 (Nb,Mo) phase at the alloy-oxide interface, demonstrating the significant uphill diffusion of Nb. Chemical breakaway on the sample edges involved the oxidation of δ-Ni 3 (Nb,Mo) phase, forming powdery oxides. • Linear mass loss evolution is recorded for alloy 625 in air + 20%vol. H 2 O at 900 °C. • Chromia volatilization rate estimated at 10−6 mg.cm−2.s−1 (gas velocity 0.7 cm.s−1). • Precipitation at the metal-oxide interface of δ-Ni 3 (Nb,Mo) phase is quantified. • Significant uphill diffusion of Nb when alloy 625 oxidizes in air + 20%vol. H 2 O. • MoO 3 (g) and powdery oxides form at the sample edges when chemical breakaway occurs. [ABSTRACT FROM AUTHOR]
Copyright of Corrosion Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Subsurface microstructural changes of alloy 625 related to oxidation at 900 °C in lab air and humid air.
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  Data: <searchLink fieldCode="AR" term="%22Jacquard%2C+B%2E%22">Jacquard, B.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> bruno.jacquard@univ-lorraine.fr</i><br /><searchLink fieldCode="AR" term="%22Mathieu%2C+S%2E%22">Mathieu, S.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> stephane.mathieu@univ-lorraine.fr</i><br /><searchLink fieldCode="AR" term="%22Steciuk%2C+G%2E%22">Steciuk, G.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> gwladys.steciuk@univ-lorraine.fr</i><br /><searchLink fieldCode="AR" term="%22Migot%2C+S%2E%22">Migot, S.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> sylvie.migot@univ-lorraine.fr</i><br /><searchLink fieldCode="AR" term="%22Bonina%2C+D%2E%22">Bonina, D.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> david.bonina@univ-lorraine.fr</i><br /><searchLink fieldCode="AR" term="%22Perez%2C+T%2E%22">Perez, T.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> thomas.perez@safrangroup.com</i><br /><searchLink fieldCode="AR" term="%22Epifano%2C+E%2E%22">Epifano, E.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> enrica.epifano@toulouse-inp.fr</i><br /><searchLink fieldCode="AR" term="%22Monceau%2C+D%2E%22">Monceau, D.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> daniel.monceau@toulouse-inp.fr</i><br /><searchLink fieldCode="AR" term="%22Vande+Put%2C+A%2E%22">Vande Put, A.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> aurelie.vandeput@ensiacet.fr</i>
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  Data: <searchLink fieldCode="DE" term="%22Oxidation%22">Oxidation</searchLink><br /><searchLink fieldCode="DE" term="%22Precipitation+%28Chemistry%29%22">Precipitation (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+decomposition%22">Chemical decomposition</searchLink><br /><searchLink fieldCode="DE" term="%22Molybdenum+oxides%22">Molybdenum oxides</searchLink><br /><searchLink fieldCode="DE" term="%22Kirkendall+effect%22">Kirkendall effect</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Alloy 625 was oxidized at 900 °C in lab air and in air + 20%vol. H 2 O for 400 h to estimate the microstructural changes experienced by the alloy during exposure at high temperature. The specimen mass loss in air + 20%vol. H 2 O evolved linearly after a very short period of exposure due to the formation of volatile species from the protective Cr 2 O 3 layer. The chromium loss rate was in the order of 5.5 × 10−7 mg.cm-2.s-1 (evaluated by direct mass variation measurements) and 7.5 × 10−7 mg.cm-2.s-1 (evaluated from Cr-mass balance) in air + 20%vol. H 2 O in the present conditions. Pronounced chemical and microstructural changes were observed in the subsurface for samples exposed in air + 20%vol. H2O. The recession of the alloy interface due to chromium removal was insufficient to explain the pronounced accumulation of δ-Ni 3 (Nb,Mo) phase at the alloy-oxide interface, demonstrating the significant uphill diffusion of Nb. Chemical breakaway on the sample edges involved the oxidation of δ-Ni 3 (Nb,Mo) phase, forming powdery oxides. • Linear mass loss evolution is recorded for alloy 625 in air + 20%vol. H 2 O at 900 °C. • Chromia volatilization rate estimated at 10−6 mg.cm−2.s−1 (gas velocity 0.7 cm.s−1). • Precipitation at the metal-oxide interface of δ-Ni 3 (Nb,Mo) phase is quantified. • Significant uphill diffusion of Nb when alloy 625 oxidizes in air + 20%vol. H 2 O. • MoO 3 (g) and powdery oxides form at the sample edges when chemical breakaway occurs. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Corrosion Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.corsci.2026.113815
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      – Code: eng
        Text: English
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      – SubjectFull: Molybdenum oxides
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      – SubjectFull: Kirkendall effect
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              Text: Jul2026
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