Steam oxidation behavior of Ni-base superalloys 690, 725 and X-750 at 600 and 650°C

Journal Article · Wed Jun 19 00:00:00 EDT 2019 · Corrosion Science

DOI:https://doi.org/10.1016/j.corsci.2019.06.014· OSTI ID:1546527

Tan, Lizhen  ^[1]; Chen, Tianyi  ^[1]; Pint, Bruce A.  ^[1]

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1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The 1-bar steam oxidation behavior of Ni-base superalloys 690, 725, and X-750 was evaluated at 600 and 650 °C for up to 5000 h. In addition to monitoring mass changes, microstructures of the 5000-h-exposed samples were characterized using scanning and transmission electron microscopy and energy dispersive x-ray spectroscopy. Together with thermodynamic calculations, the scale constitution and possible exfoliation was discussed. Alloy X-750 exhibited the best resistance to steam oxidation with the least metal thickness loss at 600 °C while alloy 690 at 650 °C. Alloy 725 exhibited more than two times metal thickness loss than the other two alloys at 650 °C.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Nuclear Energy (NE)
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1546527
• Alternate ID(s): OSTI ID: 1775693
• Journal Information: Corrosion Science, Vol. 157, Issue C; ISSN 0010-938X
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
A. Superalloys
B. SEM
B. TEM
C. Oxidation